Fixed JsonPathMatcher to match nested objects (#966)

* Fixed JsonPathMatcher to match nested objects

* fix

* .

* 100%

src/WireMock.Net/Matchers/JSONPathMatcher.cs

@@ -121,6 +121,32 @@ public class JsonPathMatcher : IStringMatcher, IObjectMatcher
 
     private double IsMatch(JToken jToken)
     {
-        return MatchScores.ToScore(_patterns.Select(pattern => jToken.SelectToken(pattern.GetPattern()) != null).ToArray(), MatchOperator);
+        var array = ConvertJTokenToJArrayIfNeeded(jToken);
+
+        return MatchScores.ToScore(_patterns.Select(pattern => array.SelectToken(pattern.GetPattern())?.Any() == true).ToArray(), MatchOperator);
+    }
+
+    // https://github.com/WireMock-Net/WireMock.Net/issues/965
+    // https://stackoverflow.com/questions/66922188/newtonsoft-jsonpath-with-c-sharp-syntax
+    // Filtering using SelectToken() isn't guaranteed to work for objects inside objects -- only objects inside arrays.
+    // So this code checks if it's an JArray, if it's not an array, construct a new JArray.
+    private static JToken ConvertJTokenToJArrayIfNeeded(JToken jToken)
+    {
+        if (jToken.Count() == 1)
+        {
+            var property = jToken.First();
+            var item = property.First();
+            if (item is JArray)
+            {
+               return jToken;
+            }
+            
+            return new JObject
+            {
+                [property.Path] = new JArray(item)
+            };
+        }
+
+        return jToken;
     }
 }

test/WireMock.Net.Tests/Matchers/JsonPathMatcherTests.cs

@@ -11,7 +11,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_GetName()
     {
-        // Assign
+        // Arrange
         var matcher = new JsonPathMatcher("X");
 
         // Act
@@ -24,7 +24,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_GetPatterns()
     {
-        // Assign
+        // Arrange
         var matcher = new JsonPathMatcher("X");
 
         // Act
@@ -37,7 +37,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_IsMatch_ByteArray()
     {
-        // Assign
+        // Arrange
         var bytes = EmptyArray<byte>.Value;
         var matcher = new JsonPathMatcher("");
 
@@ -51,7 +51,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_IsMatch_NullString()
     {
-        // Assign
+        // Arrange
         string? s = null;
         var matcher = new JsonPathMatcher("");
 
@@ -65,7 +65,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_IsMatch_NullObject()
     {
-        // Assign
+        // Arrange
         object? o = null;
         var matcher = new JsonPathMatcher("");
 
@@ -79,7 +79,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_IsMatch_String_Exception_Mismatch()
     {
-        // Assign
+        // Arrange
         var matcher = new JsonPathMatcher("xxx");
 
         // Act 
@@ -92,7 +92,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_IsMatch_Object_Exception_Mismatch()
     {
-        // Assign
+        // Arrange
         var matcher = new JsonPathMatcher("");
 
         // Act 
@@ -105,7 +105,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_IsMatch_AnonymousObject()
     {
-        // Assign 
+        // Arrange 
         var matcher = new JsonPathMatcher("$..[?(@.Id == 1)]");
 
         // Act 
@@ -115,10 +115,51 @@ public class JsonPathMatcherTests
         Check.That(match).IsEqualTo(1);
     }
 
+    [Fact]
+    public void JsonPathMatcher_IsMatch_AnonymousObject_WithNestedObject()
+    {
+        // Arrange
+        var matcher = new JsonPathMatcher("$.things[?(@.name == 'x')]");
+
+        // Act 
+        double match = matcher.IsMatch(new { things = new { name = "x" } });
+
+        // Assert 
+        Check.That(match).IsEqualTo(1);
+    }
+
+    [Fact]
+    public void JsonPathMatcher_IsMatch_String_WithNestedObject()
+    {
+        // Arrange
+        var json = "{ \"things\": { \"name\": \"x\" } }";
+        var matcher = new JsonPathMatcher("$.things[?(@.name == 'x')]");
+
+        // Act 
+        double match = matcher.IsMatch(json);
+
+        // Assert 
+        Check.That(match).IsEqualTo(1);
+    }
+
+    [Fact]
+    public void JsonPathMatcher_IsNoMatch_String_WithNestedObject()
+    {
+        // Arrange
+        var json = "{ \"things\": { \"name\": \"y\" } }";
+        var matcher = new JsonPathMatcher("$.things[?(@.name == 'x')]");
+
+        // Act 
+        double match = matcher.IsMatch(json);
+
+        // Assert 
+        Check.That(match).IsEqualTo(0);
+    }
+
     [Fact]
     public void JsonPathMatcher_IsMatch_JObject()
     {
-        // Assign 
+        // Arrange 
         string[] patterns = { "$..[?(@.Id == 1)]" };
         var matcher = new JsonPathMatcher(patterns);
 
@@ -137,7 +178,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_IsMatch_JObject_Parsed()
     {
-        // Assign 
+        // Arrange 
         var matcher = new JsonPathMatcher("$..[?(@.Id == 1)]");
 
         // Act 
@@ -150,7 +191,7 @@ public class JsonPathMatcherTests
     [Fact]
     public void JsonPathMatcher_IsMatch_RejectOnMatch()
     {
-        // Assign
+        // Arrange
         var matcher = new JsonPathMatcher(MatchBehaviour.RejectOnMatch, false, MatchOperator.Or, "$..[?(@.Id == 1)]");
 
         // Act