WIP: Unit tests

CoreStore.xcodeproj/project.pbxproj

@@ -99,6 +99,24 @@
 		B51FE5AF1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51FE5AA1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift */; };
 		B5202CFA1C04688100DED140 /* NSFetchedResultsController+Convenience.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5202CF91C04688100DED140 /* NSFetchedResultsController+Convenience.swift */; };
 		B5202CFD1C046E8400DED140 /* NSFetchedResultsController+Convenience.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5202CF91C04688100DED140 /* NSFetchedResultsController+Convenience.swift */; };
+		B525576C1CFAF18F00E51965 /* IntoTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525576B1CFAF18F00E51965 /* IntoTests.swift */; };
+		B525576D1CFAF18F00E51965 /* IntoTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525576B1CFAF18F00E51965 /* IntoTests.swift */; };
+		B525576E1CFAF18F00E51965 /* IntoTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525576B1CFAF18F00E51965 /* IntoTests.swift */; };
+		B52557701D02561A00E51965 /* SelectTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525576F1D02561A00E51965 /* SelectTests.swift */; };
+		B52557711D02561A00E51965 /* SelectTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525576F1D02561A00E51965 /* SelectTests.swift */; };
+		B52557721D02561A00E51965 /* SelectTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525576F1D02561A00E51965 /* SelectTests.swift */; };
+		B52557741D02791400E51965 /* WhereTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557731D02791400E51965 /* WhereTests.swift */; };
+		B52557751D02791400E51965 /* WhereTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557731D02791400E51965 /* WhereTests.swift */; };
+		B52557761D02791400E51965 /* WhereTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557731D02791400E51965 /* WhereTests.swift */; };
+		B52557781D02826E00E51965 /* OrderByTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557771D02826E00E51965 /* OrderByTests.swift */; };
+		B52557791D02826E00E51965 /* OrderByTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557771D02826E00E51965 /* OrderByTests.swift */; };
+		B525577A1D02826E00E51965 /* OrderByTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557771D02826E00E51965 /* OrderByTests.swift */; };
+		B525577C1D0291FE00E51965 /* GroupByTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525577B1D0291FE00E51965 /* GroupByTests.swift */; };
+		B525577D1D0291FE00E51965 /* GroupByTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525577B1D0291FE00E51965 /* GroupByTests.swift */; };
+		B525577E1D0291FE00E51965 /* GroupByTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525577B1D0291FE00E51965 /* GroupByTests.swift */; };
+		B52557801D029D2500E51965 /* TweakTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525577F1D029D2500E51965 /* TweakTests.swift */; };
+		B52557811D029D2500E51965 /* TweakTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525577F1D029D2500E51965 /* TweakTests.swift */; };
+		B52557821D029D2500E51965 /* TweakTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B525577F1D029D2500E51965 /* TweakTests.swift */; };
 		B52661401CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */; };
 		B52661411CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */; };
 		B52661421CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */; };
@@ -215,9 +233,9 @@
 		B5489F4C1CF5F743008B4978 /* BaseTestCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4B1CF5F743008B4978 /* BaseTestCase.swift */; };
 		B5489F4D1CF5F743008B4978 /* BaseTestCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4B1CF5F743008B4978 /* BaseTestCase.swift */; };
 		B5489F4E1CF5F743008B4978 /* BaseTestCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4B1CF5F743008B4978 /* BaseTestCase.swift */; };
-		B5489F501CF603D5008B4978 /* ClauseTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4F1CF603D5008B4978 /* ClauseTests.swift */; };
+		B5489F501CF603D5008B4978 /* FromTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4F1CF603D5008B4978 /* FromTests.swift */; };
-		B5489F511CF603D5008B4978 /* ClauseTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4F1CF603D5008B4978 /* ClauseTests.swift */; };
+		B5489F511CF603D5008B4978 /* FromTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4F1CF603D5008B4978 /* FromTests.swift */; };
-		B5489F521CF603D5008B4978 /* ClauseTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4F1CF603D5008B4978 /* ClauseTests.swift */; };
+		B5489F521CF603D5008B4978 /* FromTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F4F1CF603D5008B4978 /* FromTests.swift */; };
 		B54A6A551BA15F2A007870FD /* FetchedResultsControllerDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = B54A6A541BA15F2A007870FD /* FetchedResultsControllerDelegate.swift */; };
 		B5519A401CA1B17B002BEF78 /* ErrorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5519A3F1CA1B17B002BEF78 /* ErrorTests.swift */; };
 		B5519A411CA1B17B002BEF78 /* ErrorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5519A3F1CA1B17B002BEF78 /* ErrorTests.swift */; };
@@ -646,6 +664,12 @@
 		B51BE0691B47FC4B0069F532 /* NSManagedObjectModel+Setup.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSManagedObjectModel+Setup.swift"; sourceTree = "<group>"; };
 		B51FE5AA1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "CoreStore+CustomDebugStringConvertible.swift"; sourceTree = "<group>"; };
 		B5202CF91C04688100DED140 /* NSFetchedResultsController+Convenience.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSFetchedResultsController+Convenience.swift"; sourceTree = "<group>"; };
+		B525576B1CFAF18F00E51965 /* IntoTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = IntoTests.swift; sourceTree = "<group>"; };
+		B525576F1D02561A00E51965 /* SelectTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SelectTests.swift; sourceTree = "<group>"; };
+		B52557731D02791400E51965 /* WhereTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = WhereTests.swift; sourceTree = "<group>"; };
+		B52557771D02826E00E51965 /* OrderByTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = OrderByTests.swift; sourceTree = "<group>"; };
+		B525577B1D0291FE00E51965 /* GroupByTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GroupByTests.swift; sourceTree = "<group>"; };
+		B525577F1D029D2500E51965 /* TweakTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TweakTests.swift; sourceTree = "<group>"; };
 		B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CoreStoreFetchRequest.swift; sourceTree = "<group>"; };
 		B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSSaveResult.swift; sourceTree = "<group>"; };
 		B52DD1741BE1F8CC00949AFE /* CoreStore.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = CoreStore.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -664,7 +688,7 @@
 		B5489F3E1CF5EEBC008B4978 /* TestEntity2.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestEntity2.swift; sourceTree = "<group>"; };
 		B5489F451CF5F017008B4978 /* TransactionTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TransactionTests.swift; sourceTree = "<group>"; };
 		B5489F4B1CF5F743008B4978 /* BaseTestCase.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = BaseTestCase.swift; sourceTree = "<group>"; };
-		B5489F4F1CF603D5008B4978 /* ClauseTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ClauseTests.swift; sourceTree = "<group>"; };
+		B5489F4F1CF603D5008B4978 /* FromTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FromTests.swift; sourceTree = "<group>"; };
 		B54A6A541BA15F2A007870FD /* FetchedResultsControllerDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FetchedResultsControllerDelegate.swift; sourceTree = "<group>"; };
 		B5519A3F1CA1B17B002BEF78 /* ErrorTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ErrorTests.swift; sourceTree = "<group>"; };
 		B5519A491CA1F4FB002BEF78 /* CSError.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSError.swift; sourceTree = "<group>"; };
@@ -911,18 +935,24 @@
 		2F03A53C19C5C6DA005002A5 /* CoreStoreTests */ = {
 			isa = PBXGroup;
 			children = (
-				B5519A3F1CA1B17B002BEF78 /* ErrorTests.swift */,
+				B5489F4A1CF5F743008B4978 /* BaseTests */,
-				B5DC47C51C93D22900FA3BF3 /* MigrationChainTests.swift */,
-				B58085741CDF7F00004C2EEB /* SetupTests.swift */,
-				B5DC47C91C93D9C800FA3BF3 /* StorageInterfaceTests.swift */,
-				B5489F4F1CF603D5008B4978 /* ClauseTests.swift */,
-				B5489F451CF5F017008B4978 /* TransactionTests.swift */,
-				2F03A53F19C5C6DA005002A5 /* CoreStoreTests.swift */,
 				B5DBE2DD1C9939E100B5CEFA /* BridgingTests.h */,
 				B5DBE2DE1C9939E100B5CEFA /* BridgingTests.m */,
-				B5489F4A1CF5F743008B4978 /* BaseTests */,
+				2F03A53F19C5C6DA005002A5 /* CoreStoreTests.swift */,
-				B5489F3C1CF5EEBC008B4978 /* TestEntities */,
+				B5519A3F1CA1B17B002BEF78 /* ErrorTests.swift */,
+				B5489F4F1CF603D5008B4978 /* FromTests.swift */,
+				B525577B1D0291FE00E51965 /* GroupByTests.swift */,
+				B525576B1CFAF18F00E51965 /* IntoTests.swift */,
+				B5DC47C51C93D22900FA3BF3 /* MigrationChainTests.swift */,
+				B52557771D02826E00E51965 /* OrderByTests.swift */,
+				B525576F1D02561A00E51965 /* SelectTests.swift */,
+				B58085741CDF7F00004C2EEB /* SetupTests.swift */,
+				B5DC47C91C93D9C800FA3BF3 /* StorageInterfaceTests.swift */,
 				2F03A53D19C5C6DA005002A5 /* Supporting Files */,
+				B5489F3C1CF5EEBC008B4978 /* TestEntities */,
+				B5489F451CF5F017008B4978 /* TransactionTests.swift */,
+				B525577F1D029D2500E51965 /* TweakTests.swift */,
+				B52557731D02791400E51965 /* WhereTests.swift */,
 			);
 			path = CoreStoreTests;
 			sourceTree = "<group>";
@@ -1711,12 +1741,18 @@
 			buildActionMask = 2147483647;
 			files = (
 				B5519A401CA1B17B002BEF78 /* ErrorTests.swift in Sources */,
+				B525577C1D0291FE00E51965 /* GroupByTests.swift in Sources */,
+				B52557741D02791400E51965 /* WhereTests.swift in Sources */,
 				2F03A54019C5C6DA005002A5 /* CoreStoreTests.swift in Sources */,
 				B5DC47C61C93D22900FA3BF3 /* MigrationChainTests.swift in Sources */,
+				B525576C1CFAF18F00E51965 /* IntoTests.swift in Sources */,
 				B5D372841A39CD6900F583D9 /* Model.xcdatamodeld in Sources */,
-				B5489F501CF603D5008B4978 /* ClauseTests.swift in Sources */,
+				B5489F501CF603D5008B4978 /* FromTests.swift in Sources */,
+				B52557781D02826E00E51965 /* OrderByTests.swift in Sources */,
 				B5489F421CF5EEBC008B4978 /* TestEntity2.swift in Sources */,
+				B52557701D02561A00E51965 /* SelectTests.swift in Sources */,
 				B5489F461CF5F017008B4978 /* TransactionTests.swift in Sources */,
+				B52557801D029D2500E51965 /* TweakTests.swift in Sources */,
 				B580857A1CDF808C004C2EEB /* SetupTests.swift in Sources */,
 				B5489F4C1CF5F743008B4978 /* BaseTestCase.swift in Sources */,
 				B5DBE2DF1C9939E100B5CEFA /* BridgingTests.m in Sources */,
@@ -1846,12 +1882,18 @@
 			buildActionMask = 2147483647;
 			files = (
 				B5519A411CA1B17B002BEF78 /* ErrorTests.swift in Sources */,
+				B525577D1D0291FE00E51965 /* GroupByTests.swift in Sources */,
+				B52557751D02791400E51965 /* WhereTests.swift in Sources */,
 				B5DC47C71C93D22900FA3BF3 /* MigrationChainTests.swift in Sources */,
 				B5DBE2E01C9939E100B5CEFA /* BridgingTests.m in Sources */,
+				B525576D1CFAF18F00E51965 /* IntoTests.swift in Sources */,
 				B580857B1CDF808D004C2EEB /* SetupTests.swift in Sources */,
-				B5489F511CF603D5008B4978 /* ClauseTests.swift in Sources */,
+				B5489F511CF603D5008B4978 /* FromTests.swift in Sources */,
+				B52557791D02826E00E51965 /* OrderByTests.swift in Sources */,
 				B5489F431CF5EEBC008B4978 /* TestEntity2.swift in Sources */,
+				B52557711D02561A00E51965 /* SelectTests.swift in Sources */,
 				B5489F471CF5F017008B4978 /* TransactionTests.swift in Sources */,
+				B52557811D029D2500E51965 /* TweakTests.swift in Sources */,
 				82BA18D91C4BBD9700A0916E /* CoreStoreTests.swift in Sources */,
 				B5489F4D1CF5F743008B4978 /* BaseTestCase.swift in Sources */,
 				82BA18DC1C4BBD9C00A0916E /* Model.xcdatamodeld in Sources */,
@@ -1962,12 +2004,18 @@
 			buildActionMask = 2147483647;
 			files = (
 				B5519A421CA1B17B002BEF78 /* ErrorTests.swift in Sources */,
+				B525577E1D0291FE00E51965 /* GroupByTests.swift in Sources */,
+				B52557761D02791400E51965 /* WhereTests.swift in Sources */,
 				B5DC47C81C93D22900FA3BF3 /* MigrationChainTests.swift in Sources */,
 				B5DBE2E11C9939E100B5CEFA /* BridgingTests.m in Sources */,
+				B525576E1CFAF18F00E51965 /* IntoTests.swift in Sources */,
 				B580857C1CDF808F004C2EEB /* SetupTests.swift in Sources */,
-				B5489F521CF603D5008B4978 /* ClauseTests.swift in Sources */,
+				B5489F521CF603D5008B4978 /* FromTests.swift in Sources */,
+				B525577A1D02826E00E51965 /* OrderByTests.swift in Sources */,
 				B5489F441CF5EEBC008B4978 /* TestEntity2.swift in Sources */,
+				B52557721D02561A00E51965 /* SelectTests.swift in Sources */,
 				B5489F481CF5F017008B4978 /* TransactionTests.swift in Sources */,
+				B52557821D029D2500E51965 /* TweakTests.swift in Sources */,
 				B52DD1CC1BE1F94D00949AFE /* CoreStoreTests.swift in Sources */,
 				B5489F4E1CF5F743008B4978 /* BaseTestCase.swift in Sources */,
 				B5598BCC1BE2093D0092EFCE /* Model.xcdatamodeld in Sources */,

CoreStoreTests/BaseTests/BaseTestCase.swift

@@ -36,7 +36,7 @@ class BaseTestCase: XCTestCase {
     // MARK: Internal
     
     @nonobjc
-    func prepareStack(configuration: String = "Config1", @noescape _ closure: (dataStack: DataStack) -> Void) {
+    func prepareStack(configurations configurations: [String?] = [nil], @noescape _ closure: (dataStack: DataStack) -> Void) {
         
         let stack = DataStack(
             modelName: "Model",
@@ -44,13 +44,16 @@ class BaseTestCase: XCTestCase {
         )
         do {
             
-            try stack.addStorageAndWait(
+            try configurations.forEach {
-                SQLiteStore(
+                
-                    fileName: "\(self.dynamicType).sqlite",
+                try stack.addStorageAndWait(
-                    configuration: configuration,
+                    SQLiteStore(
-                    localStorageOptions: .RecreateStoreOnModelMismatch
+                        fileName: "\(self.dynamicType)_\($0).sqlite",
+                        configuration: $0,
+                        localStorageOptions: .RecreateStoreOnModelMismatch
+                    )
                 )
-            )
+            }
         }
         catch let error as NSError {
             

CoreStoreTests/FromTests.swift

@@ -0,0 +1,389 @@
+//
+//  FromTests.swift
+//  CoreStore
+//
+//  Copyright © 2016 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import XCTest
+
+@testable
+import CoreStore
+
+
+//MARK: - FromTests
+
+final class FromTests: BaseTestCase {
+    
+    @objc
+    dynamic func test_ThatFromClauses_ConfigureCorrectly() {
+        
+        do {
+            
+            let from = From()
+            XCTAssert(from.entityClass === NSManagedObject.self)
+            XCTAssertNil(from.dumpInfo)
+        }
+        do {
+            
+            let from = From<TestEntity1>()
+            XCTAssert(from.entityClass === TestEntity1.self)
+            XCTAssertNil(from.dumpInfo)
+        }
+        do {
+            
+            let from = From<TestEntity1>("Config1")
+            XCTAssert(from.entityClass === TestEntity1.self)
+            
+            let dumpInfo = from.dumpInfo
+            XCTAssertEqual(dumpInfo?.key, "configurations")
+            
+            let configurations = dumpInfo?.value as! [String?]
+            XCTAssertEqual(configurations.count, 1)
+            XCTAssertEqual(configurations[0], "Config1")
+        }
+        do {
+            
+            let from = From<TestEntity1>(nil, "Config1")
+            XCTAssert(from.entityClass === TestEntity1.self)
+            
+            let dumpInfo = from.dumpInfo
+            XCTAssertEqual(dumpInfo?.key, "configurations")
+            
+            let configurations = dumpInfo?.value as! [String?]
+            XCTAssertEqual(configurations.count, 2)
+            XCTAssertEqual(configurations[0], nil)
+            XCTAssertEqual(configurations[1], "Config1")
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatFromClauses_ApplyToFetchRequestsCorrectlyForDefaultConfigurations() {
+        
+        self.prepareStack(configurations: [nil]) { (dataStack) in
+            
+            do {
+                
+                let from = From<TestEntity1>()
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["PF_DEFAULT_CONFIGURATION_NAME"])
+            }
+            do {
+                
+                let from = From<TestEntity1>("Config1")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatFromClauses_ApplyToFetchRequestsCorrectlyForSingleConfigurations() {
+        
+        self.prepareStack(configurations: ["Config1"]) { (dataStack) in
+            
+            do {
+                
+                let from = From<TestEntity1>()
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["Config1"])
+            }
+            do {
+                
+                let from = From<TestEntity1>("Config1")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["Config1"])
+            }
+            do {
+                
+                let from = From<TestEntity1>("Config2")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+            do {
+                
+                let from = From<TestEntity2>()
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+            do {
+                
+                let from = From<TestEntity2>("Config1")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+            do {
+                
+                let from = From<TestEntity2>("Config2")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatFromClauses_ApplyToFetchRequestsCorrectlyForDefaultAndCustomConfigurations() {
+        
+        self.prepareStack(configurations: [nil, "Config1"]) { (dataStack) in
+            
+            do {
+                
+                let from = From<TestEntity1>()
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(Set(affectedConfigurations), ["PF_DEFAULT_CONFIGURATION_NAME", "Config1"] as Set)
+            }
+            do {
+                
+                let from = From<TestEntity1>("Config1")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["Config1"])
+            }
+            do {
+                
+                let from = From<TestEntity1>("Config2")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+            do {
+                
+                let from = From<TestEntity2>()
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["PF_DEFAULT_CONFIGURATION_NAME"])
+            }
+            do {
+                
+                let from = From<TestEntity2>("Config1")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+            do {
+                
+                let from = From<TestEntity2>("Config2")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatFromClauses_ApplyToFetchRequestsCorrectlyForMultipleConfigurations() {
+        
+        self.prepareStack(configurations: ["Config1", "Config2"]) { (dataStack) in
+            
+            do {
+                
+                let from = From<TestEntity1>()
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["Config1"])
+            }
+            do {
+                
+                let from = From<TestEntity1>("Config1")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["Config1"])
+            }
+            do {
+                
+                let from = From<TestEntity1>("Config2")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+            do {
+                
+                let from = From<TestEntity2>()
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["Config2"])
+            }
+            do {
+                
+                let from = From<TestEntity2>("Config1")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertTrue(affectedConfigurations.isEmpty)
+            }
+            do {
+                
+                let from = From<TestEntity2>("Config2")
+                
+                let request = NSFetchRequest()
+                from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(request.entity)
+                XCTAssertNotNil(request.affectedStores)
+                
+                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
+                
+                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                XCTAssertEqual(affectedConfigurations, ["Config2"])
+            }
+        }
+    }
+}

CoreStoreTests/GroupByTests.swift

@@ -0,0 +1,81 @@
+//
+//  GroupByTests.swift
+//  CoreStore
+//
+//  Copyright © 2016 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import XCTest
+
+@testable
+import CoreStore
+
+
+//MARK: - GroupByTests
+
+final class GroupByTests: BaseTestCase {
+    
+    @objc
+    dynamic func test_ThatGroupByClauses_ConfigureCorrectly() {
+        
+        do {
+            
+            let groupBy = GroupBy()
+            XCTAssertEqual(groupBy, GroupBy([] as [String]))
+            XCTAssertNotEqual(groupBy, GroupBy("key"))
+            XCTAssertTrue(groupBy.keyPaths.isEmpty)
+        }
+        do {
+            
+            let groupBy = GroupBy("key1")
+            XCTAssertEqual(groupBy, GroupBy("key1"))
+            XCTAssertEqual(groupBy, GroupBy(["key1"]))
+            XCTAssertNotEqual(groupBy, GroupBy("key2"))
+            XCTAssertEqual(groupBy.keyPaths, ["key1"])
+        }
+        do {
+            
+            let groupBy = GroupBy("key1", "key2")
+            XCTAssertEqual(groupBy, GroupBy("key1", "key2"))
+            XCTAssertEqual(groupBy, GroupBy(["key1", "key2"]))
+            XCTAssertNotEqual(groupBy, GroupBy("key2", "key1"))
+            XCTAssertEqual(groupBy.keyPaths, ["key1", "key2"])
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatGroupByClauses_ApplyToFetchRequestsCorrectly() {
+        
+        self.prepareStack { (dataStack) in
+            
+            let groupBy = GroupBy("testString")
+            
+            let request = NSFetchRequest()
+            From(TestEntity1).applyToFetchRequest(request, context: dataStack.mainContext)
+            groupBy.applyToFetchRequest(request)
+            
+            XCTAssertNotNil(request.propertiesToGroupBy)
+            
+            let attributes = (request.propertiesToGroupBy ?? []) as! [NSAttributeDescription]
+            XCTAssertEqual(attributes.map { $0.name }, groupBy.keyPaths)
+        }
+    }
+}

CoreStoreTests/IntoTests.swift

@@ -0,0 +1,204 @@
+//
+//  IntoTests.swift
+//  CoreStore
+//
+//  Copyright © 2016 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import XCTest
+
+@testable
+import CoreStore
+
+
+//MARK: - IntoTests
+
+final class IntoTests: XCTestCase {
+    
+    @objc
+    dynamic func test_ThatIntoClauseConstants_AreCorrect() {
+        
+        XCTAssertEqual(Into<NSManagedObject>.defaultConfigurationName, "PF_DEFAULT_CONFIGURATION_NAME")
+    }
+    
+    @objc
+    dynamic func test_ThatIntoClauses_ConfigureCorrectly() {
+        
+        do {
+            
+            let into = Into()
+            XCTAssert(into.entityClass === NSManagedObject.self)
+            XCTAssertNil(into.configuration)
+            XCTAssertTrue(into.inferStoreIfPossible)
+        }
+        do {
+            
+            let into = Into<TestEntity1>()
+            XCTAssert(into.entityClass === TestEntity1.self)
+            XCTAssertNil(into.configuration)
+            XCTAssertTrue(into.inferStoreIfPossible)
+        }
+        do {
+            
+            let into = Into(TestEntity1)
+            XCTAssert(into.entityClass === TestEntity1.self)
+            XCTAssertNil(into.configuration)
+            XCTAssertTrue(into.inferStoreIfPossible)
+        }
+        do {
+            
+            let into = Into(TestEntity1.self as AnyClass)
+            XCTAssert(into.entityClass === TestEntity1.self)
+            XCTAssertNil(into.configuration)
+            XCTAssertTrue(into.inferStoreIfPossible)
+        }
+        do {
+            
+            let into = Into<TestEntity1>("Config1")
+            XCTAssert(into.entityClass === TestEntity1.self)
+            XCTAssertEqual(into.configuration, "Config1")
+            XCTAssertFalse(into.inferStoreIfPossible)
+        }
+        do {
+            
+            let into = Into(TestEntity1.self, "Config1")
+            XCTAssert(into.entityClass === TestEntity1.self)
+            XCTAssertEqual(into.configuration, "Config1")
+            XCTAssertFalse(into.inferStoreIfPossible)
+        }
+        do {
+            
+            let into = Into(TestEntity1.self as AnyClass, "Config1")
+            XCTAssert(into.entityClass === TestEntity1.self)
+            XCTAssertEqual(into.configuration, "Config1")
+            XCTAssertFalse(into.inferStoreIfPossible)
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatIntoClauses_AreEquatable() {
+        
+        do {
+            
+            let into = Into()
+            XCTAssertEqual(into, Into())
+            XCTAssertEqual(into, Into<NSManagedObject>())
+            XCTAssertEqual(into, Into(NSManagedObject.self as AnyClass))
+            XCTAssertFalse(into == Into<TestEntity1>())
+            XCTAssertNotEqual(into, Into<NSManagedObject>("Config1"))
+        }
+        do {
+            
+            let into = Into<TestEntity1>()
+            XCTAssertEqual(into, Into(TestEntity1))
+            XCTAssertEqual(into, Into(TestEntity1.self as AnyClass))
+            XCTAssertFalse(into == Into<TestEntity2>())
+            XCTAssertNotEqual(into, Into<TestEntity1>("Config1"))
+        }
+        do {
+            
+            let into = Into(TestEntity1)
+            XCTAssertEqual(into, Into<TestEntity1>())
+            XCTAssertEqual(into, Into(TestEntity1.self as AnyClass))
+            XCTAssertFalse(into == Into<TestEntity2>())
+            XCTAssertNotEqual(into, Into<TestEntity1>("Config1"))
+        }
+        do {
+            
+            let into = Into(TestEntity1.self as AnyClass)
+            XCTAssert(into == Into<TestEntity1>())
+            XCTAssertEqual(into, Into(TestEntity1))
+            XCTAssertFalse(into == Into<TestEntity2>())
+            XCTAssertFalse(into == Into<TestEntity1>("Config1"))
+        }
+        do {
+            
+            let into = Into<TestEntity1>("Config1")
+            XCTAssertEqual(into, Into(TestEntity1.self, "Config1"))
+            XCTAssertEqual(into, Into(TestEntity1.self as AnyClass, "Config1"))
+            XCTAssertFalse(into == Into<TestEntity2>("Config1"))
+            XCTAssertNotEqual(into, Into<TestEntity1>("Config2"))
+        }
+        do {
+            
+            let into = Into(TestEntity1.self, "Config1")
+            XCTAssertEqual(into, Into(TestEntity1.self, "Config1"))
+            XCTAssertEqual(into, Into<TestEntity1>("Config1"))
+            XCTAssertFalse(into == Into<TestEntity2>("Config1"))
+            XCTAssertNotEqual(into, Into<TestEntity1>("Config2"))
+        }
+        do {
+            
+            let into = Into(TestEntity1.self as AnyClass, "Config1")
+            XCTAssert(into == Into<TestEntity1>("Config1"))
+            XCTAssertEqual(into, Into(TestEntity1.self, "Config1"))
+            XCTAssertFalse(into == Into<TestEntity2>("Config1"))
+            XCTAssertFalse(into == Into<TestEntity1>("Config2"))
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatIntoClauses_BridgeCorrectly() {
+        
+        do {
+            
+            let into = Into()
+            let objcInto = into.bridgeToObjectiveC
+            XCTAssertEqual(into, objcInto.bridgeToSwift)
+        }
+        do {
+            
+            let into = Into<TestEntity1>()
+            let objcInto = into.bridgeToObjectiveC
+            XCTAssertTrue(into == objcInto.bridgeToSwift)
+        }
+        do {
+            
+            let into = Into(TestEntity1.self as AnyClass)
+            let objcInto = into.bridgeToObjectiveC
+            XCTAssertEqual(into, objcInto.bridgeToSwift)
+        }
+        do {
+            
+            let into = Into(TestEntity1.self as AnyClass)
+            let objcInto = into.bridgeToObjectiveC
+            XCTAssertEqual(into, objcInto.bridgeToSwift)
+        }
+        do {
+            
+            let into = Into<TestEntity1>("Config1")
+            let objcInto = into.bridgeToObjectiveC
+            XCTAssertTrue(into == objcInto.bridgeToSwift)
+        }
+        do {
+            
+            let into = Into(TestEntity1.self, "Config1")
+            let objcInto = into.bridgeToObjectiveC
+            XCTAssertTrue(into == objcInto.bridgeToSwift)
+        }
+        do {
+            
+            let into = Into(TestEntity1.self as AnyClass, "Config1")
+            let objcInto = into.bridgeToObjectiveC
+            XCTAssertTrue(into == objcInto.bridgeToSwift)
+        }
+    }
+}

CoreStoreTests/OrderByTests.swift

@@ -0,0 +1,187 @@
+//
+//  OrderByTests.swift
+//  CoreStore
+//
+//  Copyright © 2016 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import XCTest
+
+@testable
+import CoreStore
+
+
+//MARK: - OrderByTests
+
+final class OrderByTests: XCTestCase {
+    
+    @objc
+    dynamic func test_ThatOrderByClauses_ConfigureCorrectly() {
+        
+        do {
+            
+            let orderBy = OrderBy()
+            XCTAssertEqual(orderBy, OrderBy([] as [NSSortDescriptor]))
+            XCTAssertNotEqual(orderBy, OrderBy(NSSortDescriptor(key: "key", ascending: false)))
+            XCTAssertTrue(orderBy.sortDescriptors.isEmpty)
+        }
+        do {
+            
+            let sortDescriptor = NSSortDescriptor(key: "key1", ascending: true)
+            let orderBy = OrderBy(sortDescriptor)
+            XCTAssertEqual(orderBy, OrderBy(sortDescriptor))
+            XCTAssertEqual(orderBy, OrderBy(.Ascending("key1")))
+            XCTAssertNotEqual(orderBy, OrderBy(.Ascending("key2")))
+            XCTAssertNotEqual(orderBy, OrderBy(.Descending("key1")))
+            XCTAssertNotEqual(orderBy, OrderBy(NSSortDescriptor(key: "key1", ascending: false)))
+            XCTAssertEqual(orderBy, OrderBy([sortDescriptor]))
+            XCTAssertEqual(orderBy.sortDescriptors, [sortDescriptor])
+        }
+        do {
+            
+            let sortDescriptors = [
+                NSSortDescriptor(key: "key1", ascending: true),
+                NSSortDescriptor(key: "key2", ascending: false)
+            ]
+            let orderBy = OrderBy(sortDescriptors)
+            XCTAssertEqual(orderBy, OrderBy(sortDescriptors))
+            XCTAssertEqual(orderBy, OrderBy(.Ascending("key1"), .Descending("key2")))
+            XCTAssertNotEqual(
+                orderBy,
+                OrderBy(
+                    [
+                        NSSortDescriptor(key: "key1", ascending: false),
+                        NSSortDescriptor(key: "key2", ascending: false)
+                    ]
+                )
+            )
+            XCTAssertNotEqual(orderBy, OrderBy(.Ascending("key1"), .Ascending("key2")))
+            XCTAssertNotEqual(orderBy, OrderBy(.Ascending("key1"), .Descending("key3")))
+            XCTAssertEqual(orderBy.sortDescriptors, sortDescriptors)
+        }
+        do {
+            
+            let orderBy = OrderBy(.Ascending("key1"))
+            let sortDescriptor = NSSortDescriptor(key: "key1", ascending: true)
+            XCTAssertEqual(orderBy, OrderBy(sortDescriptor))
+            XCTAssertEqual(orderBy, OrderBy(.Ascending("key1")))
+            XCTAssertNotEqual(orderBy, OrderBy(.Descending("key1")))
+            XCTAssertNotEqual(orderBy, OrderBy(.Ascending("key2")))
+            XCTAssertEqual(orderBy, OrderBy([sortDescriptor]))
+            XCTAssertEqual(orderBy.sortDescriptors, [sortDescriptor])
+        }
+        do {
+            
+            let orderBy = OrderBy(.Ascending("key1"), .Descending("key2"))
+            let sortDescriptors = [
+                NSSortDescriptor(key: "key1", ascending: true),
+                NSSortDescriptor(key: "key2", ascending: false)
+            ]
+            XCTAssertEqual(orderBy, OrderBy(sortDescriptors))
+            XCTAssertEqual(orderBy, OrderBy(.Ascending("key1"), .Descending("key2")))
+            XCTAssertNotEqual(
+                orderBy,
+                OrderBy(
+                    [
+                        NSSortDescriptor(key: "key1", ascending: false),
+                        NSSortDescriptor(key: "key2", ascending: false)
+                    ]
+                )
+            )
+            XCTAssertNotEqual(orderBy, OrderBy(.Ascending("key1"), .Ascending("key2")))
+            XCTAssertNotEqual(orderBy, OrderBy(.Ascending("key1"), .Descending("key3")))
+            XCTAssertEqual(orderBy.sortDescriptors, sortDescriptors)
+        }
+        do {
+            
+            let sortKeys: [SortKey] = [.Ascending("key1"), .Descending("key2")]
+            let orderBy = OrderBy(sortKeys)
+            let sortDescriptors = [
+                NSSortDescriptor(key: "key1", ascending: true),
+                NSSortDescriptor(key: "key2", ascending: false)
+            ]
+            XCTAssertEqual(orderBy, OrderBy(sortDescriptors))
+            XCTAssertEqual(orderBy, OrderBy(.Ascending("key1"), .Descending("key2")))
+            XCTAssertNotEqual(
+                orderBy,
+                OrderBy(
+                    [
+                        NSSortDescriptor(key: "key1", ascending: false),
+                        NSSortDescriptor(key: "key2", ascending: false)
+                    ]
+                )
+            )
+            XCTAssertNotEqual(orderBy, OrderBy(.Ascending("key1"), .Ascending("key2")))
+            XCTAssertNotEqual(orderBy, OrderBy(.Ascending("key1"), .Descending("key3")))
+            XCTAssertEqual(orderBy.sortDescriptors, sortDescriptors)
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatOrderByClauseOperations_ComputeCorrectly() {
+        
+        let orderBy1 = OrderBy(.Ascending("key1"))
+        let orderBy2 = OrderBy(.Descending("key2"))
+        let orderBy3 = OrderBy(.Ascending("key3"))
+        
+        do {
+            
+            let plusOrderBy = orderBy1 + orderBy2 + orderBy3
+            XCTAssertEqual(plusOrderBy, OrderBy(.Ascending("key1"), .Descending("key2"), .Ascending("key3")))
+            XCTAssertEqual(plusOrderBy, OrderBy(.Ascending("key1")) + OrderBy(.Descending("key2"), .Ascending("key3")))
+            XCTAssertNotEqual(plusOrderBy, orderBy1 + orderBy3 + orderBy2)
+            XCTAssertNotEqual(plusOrderBy, orderBy2 + orderBy1 + orderBy3)
+            XCTAssertNotEqual(plusOrderBy, orderBy2 + orderBy3 + orderBy1)
+            XCTAssertNotEqual(plusOrderBy, orderBy3 + orderBy1 + orderBy2)
+            XCTAssertNotEqual(plusOrderBy, orderBy3 + orderBy2 + orderBy1)
+            XCTAssertEqual(plusOrderBy.sortDescriptors, orderBy1.sortDescriptors + orderBy2.sortDescriptors + orderBy3.sortDescriptors)
+        }
+        do {
+            
+            var plusOrderBy = orderBy1
+            plusOrderBy += orderBy2
+            XCTAssertEqual(plusOrderBy, OrderBy(.Ascending("key1"), .Descending("key2")))
+            XCTAssertEqual(plusOrderBy, OrderBy(.Ascending("key1")) + OrderBy(.Descending("key2")))
+            XCTAssertNotEqual(plusOrderBy, orderBy2 + orderBy1)
+            XCTAssertEqual(plusOrderBy.sortDescriptors, orderBy1.sortDescriptors + orderBy2.sortDescriptors)
+            
+            plusOrderBy += orderBy3
+            XCTAssertEqual(plusOrderBy, OrderBy(.Ascending("key1"), .Descending("key2"), .Ascending("key3")))
+            XCTAssertEqual(plusOrderBy, OrderBy(.Ascending("key1"), .Descending("key2")) + OrderBy(.Ascending("key3")))
+            XCTAssertNotEqual(plusOrderBy, orderBy1 + orderBy3 + orderBy2)
+            XCTAssertNotEqual(plusOrderBy, orderBy2 + orderBy1 + orderBy3)
+            XCTAssertNotEqual(plusOrderBy, orderBy2 + orderBy3 + orderBy1)
+            XCTAssertNotEqual(plusOrderBy, orderBy3 + orderBy1 + orderBy2)
+            XCTAssertNotEqual(plusOrderBy, orderBy3 + orderBy2 + orderBy1)
+            XCTAssertEqual(plusOrderBy.sortDescriptors, orderBy1.sortDescriptors + orderBy2.sortDescriptors + orderBy3.sortDescriptors)
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatOrderByClauses_ApplyToFetchRequestsCorrectly() {
+        
+        let orderBy = OrderBy(.Ascending("key"))
+        let request = NSFetchRequest()
+        orderBy.applyToFetchRequest(request)
+        XCTAssertNotNil(request.sortDescriptors)
+        XCTAssertEqual(request.sortDescriptors ?? [], orderBy.sortDescriptors)
+    }
+}

CoreStoreTests/SelectTests.swift

@@ -0,0 +1,420 @@
+//
+//  SelectTests.swift
+//  CoreStore
+//
+//  Copyright © 2016 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import XCTest
+
+@testable
+import CoreStore
+
+
+//MARK: - SelectTests
+
+final class SelectTests: XCTestCase {
+    
+    @objc
+    dynamic func test_ThatAttributeSelectTerms_ConfigureCorrectly() {
+        
+        do {
+            
+            let term: SelectTerm = "attribute"
+            XCTAssertEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Attribute(let key):
+                XCTAssertEqual(key, "attribute")
+                
+            default:
+                XCTFail()
+            }
+        }
+        do {
+            
+            let term = SelectTerm.Attribute("attribute")
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Attribute(let key):
+                XCTAssertEqual(key, "attribute")
+                
+            default:
+                XCTFail()
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatAverageSelectTerms_ConfigureCorrectly() {
+        
+        do {
+            
+            let term = SelectTerm.Average("attribute")
+            XCTAssertEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "average:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "average(attribute)")
+                XCTAssertTrue(nativeType == .DecimalAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+        do {
+            
+            let term = SelectTerm.Average("attribute", As: "alias")
+            XCTAssertEqual(term, SelectTerm.Average("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute", As: "alias2"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "average:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "alias")
+                XCTAssertTrue(nativeType == .DecimalAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatCountSelectTerms_ConfigureCorrectly() {
+        
+        do {
+            
+            let term = SelectTerm.Count("attribute")
+            XCTAssertEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "count:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "count(attribute)")
+                XCTAssertTrue(nativeType == .Integer64AttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+        do {
+            
+            let term = SelectTerm.Count("attribute", As: "alias")
+            XCTAssertEqual(term, SelectTerm.Count("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute", As: "alias2"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "count:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "alias")
+                XCTAssertTrue(nativeType == .Integer64AttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatMaximumSelectTerms_ConfigureCorrectly() {
+        
+        do {
+            
+            let term = SelectTerm.Maximum("attribute")
+            XCTAssertEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "max:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "max(attribute)")
+                XCTAssertTrue(nativeType == .UndefinedAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+        do {
+            
+            let term = SelectTerm.Maximum("attribute", As: "alias")
+            XCTAssertEqual(term, SelectTerm.Maximum("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute", As: "alias2"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "max:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "alias")
+                XCTAssertTrue(nativeType == .UndefinedAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatMinimumSelectTerms_ConfigureCorrectly() {
+        
+        do {
+            
+            let term = SelectTerm.Minimum("attribute")
+            XCTAssertEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "min:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "min(attribute)")
+                XCTAssertTrue(nativeType == .UndefinedAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+        do {
+            
+            let term = SelectTerm.Minimum("attribute", As: "alias")
+            XCTAssertEqual(term, SelectTerm.Minimum("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute", As: "alias2"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "min:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "alias")
+                XCTAssertTrue(nativeType == .UndefinedAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatSumSelectTerms_ConfigureCorrectly() {
+        
+        do {
+            
+            let term = SelectTerm.Sum("attribute")
+            XCTAssertEqual(term, SelectTerm.Sum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "sum:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "sum(attribute)")
+                XCTAssertTrue(nativeType == .DecimalAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+        do {
+            
+            let term = SelectTerm.Sum("attribute", As: "alias")
+            XCTAssertEqual(term, SelectTerm.Sum("attribute", As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute", As: "alias2"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute2"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            switch term {
+                
+            case ._Aggregate(let function, let keyPath, let alias, let nativeType):
+                XCTAssertEqual(function, "sum:")
+                XCTAssertEqual(keyPath, "attribute")
+                XCTAssertEqual(alias, "alias")
+                XCTAssertTrue(nativeType == .DecimalAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatObjectIDSelectTerms_ConfigureCorrectly() {
+        
+        do {
+            
+            let term = SelectTerm.ObjectID()
+            XCTAssertEqual(term, SelectTerm.ObjectID())
+            XCTAssertNotEqual(term, SelectTerm.ObjectID(As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            switch term {
+                
+            case ._Identity(let alias, let nativeType):
+                XCTAssertEqual(alias, "objectID")
+                XCTAssertTrue(nativeType == .ObjectIDAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+        do {
+            
+            let term = SelectTerm.ObjectID(As: "alias")
+            XCTAssertEqual(term, SelectTerm.ObjectID(As: "alias"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID(As: "alias2"))
+            XCTAssertNotEqual(term, SelectTerm.ObjectID())
+            XCTAssertNotEqual(term, SelectTerm.Attribute("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Average("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Count("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Maximum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Minimum("attribute"))
+            XCTAssertNotEqual(term, SelectTerm.Sum("attribute"))
+            switch term {
+                
+            case ._Identity(let alias, let nativeType):
+                XCTAssertEqual(alias, "alias")
+                XCTAssertTrue(nativeType == .ObjectIDAttributeType)
+                
+            default:
+                XCTFail()
+            }
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatSelectClauses_ConfigureCorrectly() {
+        
+        let term1 = SelectTerm.Attribute("attribute1")
+        let term2 = SelectTerm.Attribute("attribute2")
+        let term3 = SelectTerm.Attribute("attribute3")
+        do {
+            
+            let select = Select<Int>(term1, term2, term3)
+            XCTAssertEqual(select.selectTerms, [term1, term2, term3])
+            XCTAssertNotEqual(select.selectTerms, [term1, term3, term2])
+            XCTAssertNotEqual(select.selectTerms, [term2, term1, term3])
+            XCTAssertNotEqual(select.selectTerms, [term2, term3, term1])
+            XCTAssertNotEqual(select.selectTerms, [term3, term1, term2])
+            XCTAssertNotEqual(select.selectTerms, [term3, term2, term1])
+        }
+        do {
+            
+            let select = Select<Int>([term1, term2, term3])
+            XCTAssertEqual(select.selectTerms, [term1, term2, term3])
+            XCTAssertNotEqual(select.selectTerms, [term1, term3, term2])
+            XCTAssertNotEqual(select.selectTerms, [term2, term1, term3])
+            XCTAssertNotEqual(select.selectTerms, [term2, term3, term1])
+            XCTAssertNotEqual(select.selectTerms, [term3, term1, term2])
+            XCTAssertNotEqual(select.selectTerms, [term3, term2, term1])
+        }
+    }
+}

CoreStoreTests/TweakTests.swift

@@ -1,5 +1,5 @@
 //
-//  ClauseTests.swift
+//  TweakTests.swift
 //  CoreStore
 //
 //  Copyright © 2016 John Rommel Estropia
@@ -29,15 +29,25 @@ import XCTest
 import CoreStore
 
 
-//MARK: - ClauseTests
+//MARK: - TweakTests
 
-final class ClauseTests: XCTestCase {
+final class TweakTests: XCTestCase {
-    
-    // MARK: Into
     
     @objc
-    dynamic func test_IntoClauses_ConfigureCorrectly() {
+    dynamic func test_ThatTweakClauses_ApplyToFetchRequestsCorrectly() {
         
-        // TODO:
+        let predicate = NSPredicate(format: "%K == %@", "key", "value")
+        let tweak = Tweak {
+            
+            $0.fetchOffset = 100
+            $0.fetchLimit = 200
+            $0.predicate = predicate
+        }
+        let request = NSFetchRequest()
+        tweak.applyToFetchRequest(request)
+        XCTAssertEqual(request.fetchOffset, 100)
+        XCTAssertEqual(request.fetchLimit, 200)
+        XCTAssertNotNil(request.predicate)
+        XCTAssertEqual(request.predicate, predicate)
     }
 }

CoreStoreTests/WhereTests.swift

@@ -0,0 +1,150 @@
+//
+//  WhereTests.swift
+//  CoreStore
+//
+//  Copyright © 2016 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import XCTest
+
+@testable
+import CoreStore
+
+
+//MARK: - WhereTests
+
+final class WhereTests: XCTestCase {
+    
+    @objc
+    dynamic func test_ThatWhereClauses_ConfigureCorrectly() {
+        
+        do {
+            
+            let whereClause = Where()
+            XCTAssertEqual(whereClause, Where(true))
+            XCTAssertNotEqual(whereClause, Where(false))
+            XCTAssertEqual(whereClause.predicate, NSPredicate(value: true))
+        }
+        do {
+            
+            let whereClause = Where(true)
+            XCTAssertEqual(whereClause, Where())
+            XCTAssertNotEqual(whereClause, Where(false))
+            XCTAssertEqual(whereClause.predicate, NSPredicate(value: true))
+        }
+        do {
+            
+            let predicate = NSPredicate(format: "%K == %@", "key", "value")
+            let whereClause = Where(predicate)
+            XCTAssertEqual(whereClause, Where(predicate))
+            XCTAssertEqual(whereClause.predicate, predicate)
+        }
+        do {
+            
+            let whereClause = Where("%K == %@", "key", "value")
+            let predicate = NSPredicate(format: "%K == %@", "key", "value")
+            XCTAssertEqual(whereClause, Where(predicate))
+            XCTAssertEqual(whereClause.predicate, predicate)
+        }
+        do {
+            
+            let whereClause = Where("%K == %@", argumentArray: ["key", "value"])
+            let predicate = NSPredicate(format: "%K == %@", "key", "value")
+            XCTAssertEqual(whereClause, Where(predicate))
+            XCTAssertEqual(whereClause.predicate, predicate)
+        }
+        do {
+            
+            let whereClause = Where("key", isEqualTo: "value")
+            let predicate = NSPredicate(format: "%K == %@", "key", "value")
+            XCTAssertEqual(whereClause, Where(predicate))
+            XCTAssertEqual(whereClause.predicate, predicate)
+        }
+        do {
+            
+            let whereClause = Where("key", isMemberOf: ["value1", "value2", "value3"])
+            let predicate = NSPredicate(format: "%K IN %@", "key", ["value1", "value2", "value3"])
+            XCTAssertEqual(whereClause, Where(predicate))
+            XCTAssertEqual(whereClause.predicate, predicate)
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatWhereClauseOperations_ComputeCorrectly() {
+        
+        let whereClause1 = Where("key1", isEqualTo: "value1")
+        let whereClause2 = Where("key2", isEqualTo: "value2")
+        let whereClause3 = Where("key3", isEqualTo: "value3")
+        
+        do {
+            
+            let notWhere = !whereClause1
+            let notPredicate = NSCompoundPredicate(
+                type: .NotPredicateType,
+                subpredicates: [whereClause1.predicate]
+            )
+            XCTAssertEqual(notWhere.predicate, notPredicate)
+            XCTAssertEqual(notWhere, !whereClause1)
+        }
+        do {
+            
+            let andWhere = whereClause1 && whereClause2 && whereClause3
+            let andPredicate = NSCompoundPredicate(
+                type: .AndPredicateType,
+                subpredicates: [
+                    NSCompoundPredicate(
+                        type: .AndPredicateType,
+                        subpredicates: [whereClause1.predicate, whereClause2.predicate]
+                    ),
+                    whereClause3.predicate
+                ]
+            )
+            XCTAssertEqual(andWhere.predicate, andPredicate)
+            XCTAssertEqual(andWhere, whereClause1 && whereClause2 && whereClause3)
+        }
+        do {
+            
+            let orWhere = whereClause1 || whereClause2 || whereClause3
+            let orPredicate = NSCompoundPredicate(
+                type: .OrPredicateType,
+                subpredicates: [
+                    NSCompoundPredicate(
+                        type: .OrPredicateType,
+                        subpredicates: [whereClause1.predicate, whereClause2.predicate]
+                    ),
+                    whereClause3.predicate
+                ]
+            )
+            XCTAssertEqual(orWhere.predicate, orPredicate)
+            XCTAssertEqual(orWhere, whereClause1 || whereClause2 || whereClause3)
+        }
+    }
+    
+    @objc
+    dynamic func test_ThatWhereClauses_ApplyToFetchRequestsCorrectly() {
+        
+        let whereClause = Where("key", isEqualTo: "value")
+        let request = NSFetchRequest()
+        whereClause.applyToFetchRequest(request)
+        XCTAssertNotNil(request.predicate)
+        XCTAssertEqual(request.predicate, whereClause.predicate)
+    }
+}

Sources/Fetching and Querying/Concrete Clauses/From.swift

@@ -75,6 +75,10 @@ public struct From<T: NSManagedObject> {
      */
     public init(_ entityClass: AnyClass) {
         
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(From<T>)) with entity class \(cs_typeName(entityClass))"
+        )
         self.init(entityClass: entityClass)
     }
     
@@ -146,6 +150,10 @@ public struct From<T: NSManagedObject> {
      */
     public init(_ entityClass: AnyClass, _ configuration: String?, _ otherConfigurations: String?...) {
         
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(From<T>)) with entity class \(cs_typeName(entityClass))"
+        )
         self.init(entityClass: entityClass, configurations: [configuration] + otherConfigurations)
     }
     
@@ -160,143 +168,13 @@ public struct From<T: NSManagedObject> {
      */
     public init(_ entityClass: AnyClass, _ configurations: [String?]) {
         
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(From<T>)) with entity class \(cs_typeName(entityClass))"
+        )
         self.init(entityClass: entityClass, configurations: configurations)
     }
     
-    /**
-     Initializes a `From` clause with the specified store URLs.
-     
-     - parameter storeURL: the persistent store URL to associate objects from.
-     - parameter otherStoreURLs: an optional list of other persistent store URLs to associate objects from (see `storeURL` parameter)
-     */
-    public init(_ storeURL: NSURL, _ otherStoreURLs: NSURL...) {
-        
-        self.init(entityClass: T.self, storeURLs: [storeURL] + otherStoreURLs)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified store URLs.
-     
-     - parameter storeURLs: the persistent store URLs to associate objects from.
-     */
-    public init(_ storeURLs: [NSURL]) {
-        
-        self.init(entityClass: T.self, storeURLs: storeURLs)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified store URLs.
-     
-     - parameter entity: the associated `NSManagedObject` type
-     - parameter storeURL: the persistent store URL to associate objects from.
-     - parameter otherStoreURLs: an optional list of other persistent store URLs to associate objects from (see `storeURL` parameter)
-     */
-    public init(_ entity: T.Type, _ storeURL: NSURL, _ otherStoreURLs: NSURL...) {
-        
-        self.init(entityClass: entity, storeURLs: [storeURL] + otherStoreURLs)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified store URLs.
-     
-     - parameter entity: the associated `NSManagedObject` type
-     - parameter storeURLs: the persistent store URLs to associate objects from.
-     */
-    public init(_ entity: T.Type, _ storeURLs: [NSURL]) {
-        
-        self.init(entityClass: entity, storeURLs: storeURLs)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified store URLs.
-     
-     - parameter entity: the associated `NSManagedObject` entity class
-     - parameter storeURL: the persistent store URL to associate objects from.
-     - parameter otherStoreURLs: an optional list of other persistent store URLs to associate objects from (see `storeURL` parameter)
-     */
-    public init(_ entityClass: AnyClass, _ storeURL: NSURL, _ otherStoreURLs: NSURL...) {
-        
-        self.init(entityClass: entityClass, storeURLs: [storeURL] + otherStoreURLs)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified store URLs.
-     
-     - parameter entity: the associated `NSManagedObject` entity class
-     - parameter storeURLs: the persistent store URLs to associate objects from.
-     */
-    public init(_ entityClass: AnyClass, _ storeURLs: [NSURL]) {
-        
-        self.init(entityClass: entityClass, storeURLs: storeURLs)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified `NSPersistentStore`s.
-     
-     - parameter persistentStore: the `NSPersistentStore` to associate objects from.
-     - parameter otherPersistentStores: an optional list of other `NSPersistentStore`s to associate objects from (see `persistentStore` parameter)
-     */
-    public init(_ persistentStore: NSPersistentStore, _ otherPersistentStores: NSPersistentStore...) {
-        
-        self.init(entityClass: T.self, persistentStores: [persistentStore] + otherPersistentStores)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified `NSPersistentStore`s.
-     
-     - parameter persistentStores: the `NSPersistentStore`s to associate objects from.
-     */
-    public init(_ persistentStores: [NSPersistentStore]) {
-        
-        self.init(entityClass: T.self, persistentStores: persistentStores)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified `NSPersistentStore`s.
-     
-     - parameter entity: the associated `NSManagedObject` type
-     - parameter persistentStore: the `NSPersistentStore` to associate objects from.
-     - parameter otherPersistentStores: an optional list of other `NSPersistentStore`s to associate objects from (see `persistentStore` parameter)
-     */
-    public init(_ entity: T.Type, _ persistentStore: NSPersistentStore, _ otherPersistentStores: NSPersistentStore...) {
-        
-        self.init(entityClass: entity, persistentStores: [persistentStore] + otherPersistentStores)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified `NSPersistentStore`s.
-     
-     - parameter entity: the associated `NSManagedObject` type
-     - parameter persistentStores: the `NSPersistentStore`s to associate objects from.
-     */
-    public init(_ entity: T.Type, _ persistentStores: [NSPersistentStore]) {
-        
-        self.init(entityClass: entity, persistentStores: persistentStores)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified `NSPersistentStore`s.
-     
-     - parameter entity: the associated `NSManagedObject` entity class
-     - parameter persistentStore: the `NSPersistentStore` to associate objects from.
-     - parameter otherPersistentStores: an optional list of other `NSPersistentStore`s to associate objects from (see `persistentStore` parameter)
-     */
-    public init(_ entityClass: AnyClass, _ persistentStore: NSPersistentStore, _ otherPersistentStores: NSPersistentStore...) {
-        
-        self.init(entityClass: entityClass, persistentStores: [persistentStore] + otherPersistentStores)
-    }
-    
-    /**
-     Initializes a `From` clause with the specified `NSPersistentStore`s.
-     
-     - parameter entity: the associated `NSManagedObject` entity class
-     - parameter persistentStores: the `NSPersistentStore`s to associate objects from.
-     */
-    public init(_ entityClass: AnyClass, _ persistentStores: [NSPersistentStore]) {
-        
-        self.init(entityClass: entityClass, persistentStores: persistentStores)
-    }
-    
     
     // MARK: Internal
     
@@ -399,4 +277,131 @@ public struct From<T: NSManagedObject> {
         self.dumpInfo = dumpInfo
         self.findPersistentStores = findPersistentStores
     }
+    
+    
+    // MARK: Deprecated
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ storeURL: NSURL, _ otherStoreURLs: NSURL...) {
+        
+        self.init(entityClass: T.self, storeURLs: [storeURL] + otherStoreURLs)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ storeURLs: [NSURL]) {
+        
+        self.init(entityClass: T.self, storeURLs: storeURLs)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ entity: T.Type, _ storeURL: NSURL, _ otherStoreURLs: NSURL...) {
+        
+        self.init(entityClass: entity, storeURLs: [storeURL] + otherStoreURLs)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ entity: T.Type, _ storeURLs: [NSURL]) {
+        
+        self.init(entityClass: entity, storeURLs: storeURLs)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ entityClass: AnyClass, _ storeURL: NSURL, _ otherStoreURLs: NSURL...) {
+        
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(From<T>)) with entity class \(cs_typeName(entityClass))"
+        )
+        self.init(entityClass: entityClass, storeURLs: [storeURL] + otherStoreURLs)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ entityClass: AnyClass, _ storeURLs: [NSURL]) {
+        
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(From<T>)) with entity class \(cs_typeName(entityClass))"
+        )
+        self.init(entityClass: entityClass, storeURLs: storeURLs)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ persistentStore: NSPersistentStore, _ otherPersistentStores: NSPersistentStore...) {
+        
+        self.init(entityClass: T.self, persistentStores: [persistentStore] + otherPersistentStores)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ persistentStores: [NSPersistentStore]) {
+        
+        self.init(entityClass: T.self, persistentStores: persistentStores)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ entity: T.Type, _ persistentStore: NSPersistentStore, _ otherPersistentStores: NSPersistentStore...) {
+        
+        self.init(entityClass: entity, persistentStores: [persistentStore] + otherPersistentStores)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ entity: T.Type, _ persistentStores: [NSPersistentStore]) {
+        
+        self.init(entityClass: entity, persistentStores: persistentStores)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ entityClass: AnyClass, _ persistentStore: NSPersistentStore, _ otherPersistentStores: NSPersistentStore...) {
+        
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(From<T>)) with entity class \(cs_typeName(entityClass))"
+        )
+        self.init(entityClass: entityClass, persistentStores: [persistentStore] + otherPersistentStores)
+    }
+    
+    /**
+     Deprecated. Use initializers that accept configuration names.
+     */
+    @available(*, deprecated=2.0.0, message="Use initializers that accept configuration names.")
+    public init(_ entityClass: AnyClass, _ persistentStores: [NSPersistentStore]) {
+        
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(From<T>)) with entity class \(cs_typeName(entityClass))"
+        )
+        self.init(entityClass: entityClass, persistentStores: persistentStores)
+    }
 }

Sources/Internal/CoreStoreFetchedResultsController.swift

@@ -52,6 +52,10 @@ internal final class CoreStoreFetchedResultsController: NSFetchedResultsControll
         from?.applyToFetchRequest(fetchRequest, context: context, applyAffectedStores: false)
         applyFetchClauses(fetchRequest: fetchRequest)
         
+        CoreStore.assert(
+            fetchRequest.sortDescriptors?.isEmpty == false,
+            "An \(cs_typeName(NSFetchedResultsController)) requires a sort information. Specify from a \(cs_typeName(OrderBy)) clause or any custom \(cs_typeName(FetchClause)) that provides a sort descriptor."
+        )
         if let from = from {
             
             self.reapplyAffectedStores = { fetchRequest, context in
@@ -63,7 +67,7 @@ internal final class CoreStoreFetchedResultsController: NSFetchedResultsControll
             
             guard let from = (fetchRequest.entity.flatMap { $0.managedObjectClassName }).flatMap(NSClassFromString).flatMap(From.init) else {
                 
-                fatalError("Attempted to create an \(cs_typeName(NSFetchedResultsController)) without a  From clause or an NSEntityDescription.")
+                fatalError("Attempted to create an \(cs_typeName(NSFetchedResultsController)) without a \(cs_typeName(From)) clause or an \(cs_typeName(NSEntityDescription)).")
             }
             
             self.reapplyAffectedStores = { fetchRequest, context in

Sources/ObjectiveC/CSUnsafeDataTransaction.swift

@@ -96,31 +96,25 @@ public final class CSUnsafeDataTransaction: CSBaseDataTransaction {
      Immediately flushes all pending changes to the transaction's observers. This is useful in conjunction with `ListMonitor`s and `ObjectMonitor`s created from `UnsafeDataTransaction`s used to manage temporary "scratch" data.
      
      - Important: Note that unlike `commit()`, `flush()` does not propagate/save updates to the `DataStack` and the persistent store. However, the flushed changes will be seen by children transactions created further from the current transaction (i.e. through `transaction.beginUnsafe()`)
-     - parameter error: the `NSError` pointer that indicates the reason in case of an failure
      */
     @objc
-    public func flush(error error: NSErrorPointer) {
+    public func flush() {
         
-        bridge(error) {
+        self.bridgeToSwift.flush()
-            
-            try self.bridgeToSwift.flush()
-        }
     }
     
     /**
      Flushes all pending changes to the transaction's observers at the end of the `closure`'s execution. This is useful in conjunction with `ListMonitor`s and `ObjectMonitor`s created from `UnsafeDataTransaction`s used to manage temporary "scratch" data.
      
      - Important: Note that unlike `commit()`, `flush()` does not propagate/save updates to the `DataStack` and the persistent store. However, the flushed changes will be seen by children transactions created further from the current transaction (i.e. through `transaction.beginUnsafe()`)
-     - parameter error: the `NSError` pointer that indicates the reason in case of an failure
      - parameter closure: the closure where changes can be made prior to the flush
      */
     @objc
-    public func flush(error error: NSErrorPointer, block: () -> Void) throws {
+    public func flush(block: () -> Void) {
         
-        bridge(error) {
+        self.bridgeToSwift.flush {
             
             block()
-            try self.bridgeToSwift.context.save()
         }
     }
     

Sources/Observing/DataStack+Observing.swift

@@ -78,10 +78,6 @@ public extension DataStack {
             NSThread.isMainThread(),
             "Attempted to observe objects from \(cs_typeName(self)) outside the main thread."
         )
-        CoreStore.assert(
-            fetchClauses.contains { $0 is OrderBy },
-            "A ListMonitor requires an OrderBy clause."
-        )
         return ListMonitor(
             dataStack: self,
             from: from,
@@ -118,10 +114,6 @@ public extension DataStack {
             NSThread.isMainThread(),
             "Attempted to observe objects from \(cs_typeName(self)) outside the main thread."
         )
-        CoreStore.assert(
-            fetchClauses.contains { $0 is OrderBy },
-            "A ListMonitor requires an OrderBy clause."
-        )
         _ = ListMonitor(
             dataStack: self,
             from: from,
@@ -163,10 +155,6 @@ public extension DataStack {
             NSThread.isMainThread(),
             "Attempted to observe objects from \(cs_typeName(self)) outside the main thread."
         )
-        CoreStore.assert(
-            fetchClauses.contains { $0 is OrderBy },
-            "A ListMonitor requires an OrderBy clause."
-        )
         
         return ListMonitor(
             dataStack: self,
@@ -206,10 +194,6 @@ public extension DataStack {
             NSThread.isMainThread(),
             "Attempted to observe objects from \(cs_typeName(self)) outside the main thread."
         )
-        CoreStore.assert(
-            fetchClauses.contains { $0 is OrderBy },
-            "A ListMonitor requires an OrderBy clause."
-        )
         
         _ = ListMonitor(
             dataStack: self,

Sources/Transactions/Into.swift

@@ -75,6 +75,10 @@ public struct Into<T: NSManagedObject>: Hashable {
      */
     public init(_ entityClass: AnyClass) {
         
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(Into<T>)) with entity class \(cs_typeName(entityClass))"
+        )
         self.init(entityClass: entityClass, configuration: nil, inferStoreIfPossible: true)
     }
     
@@ -116,6 +120,10 @@ public struct Into<T: NSManagedObject>: Hashable {
      */
     public init(_ entityClass: AnyClass, _ configuration: String?) {
         
+        CoreStore.assert(
+            entityClass is T.Type,
+            "Attempted to create generic type \(cs_typeName(Into<T>)) with entity class \(cs_typeName(entityClass))"
+        )
         self.init(entityClass: entityClass, configuration: configuration, inferStoreIfPossible: false)
     }
     
@@ -171,3 +179,11 @@ public func == <T: NSManagedObject, U: NSManagedObject>(lhs: Into<T>, rhs: Into<
         && lhs.configuration == rhs.configuration
         && lhs.inferStoreIfPossible == rhs.inferStoreIfPossible
 }
+
+@warn_unused_result
+public func != <T: NSManagedObject, U: NSManagedObject>(lhs: Into<T>, rhs: Into<U>) -> Bool {
+    
+    return lhs.entityClass == rhs.entityClass
+        && lhs.configuration == rhs.configuration
+        && lhs.inferStoreIfPossible == rhs.inferStoreIfPossible
+}