Add support for Faults (#360)

* FaultType - wip

* .

* copy fault

* tests

* code-factor

* more tests

* fix tests

* fixed

* remove RANDOM_DATA_THEN_CLOSE

src/WireMock.Net/ResponseBuilders/FaultType.cs

@@ -0,0 +1,23 @@
+namespace WireMock.ResponseBuilders
+{
+    /// <summary>
+    /// The FaultType enumeration
+    /// </summary>
+    public enum FaultType
+    {
+        /// <summary>
+        /// No Fault
+        /// </summary>
+        NONE,
+
+        /// <summary>
+        /// Return a completely empty response.
+        /// </summary>
+        EMPTY_RESPONSE,
+
+        /// <summary>
+        /// Send a defined status header, then garbage, then close the connection.
+        /// </summary>
+        MALFORMED_RESPONSE_CHUNK
+    }
+}

src/WireMock.Net/ResponseBuilders/IBodyResponseBuilder.cs

@@ -7,7 +7,7 @@ namespace WireMock.ResponseBuilders
     /// <summary>
     /// The BodyResponseBuilder interface.
     /// </summary>
-    public interface IBodyResponseBuilder : ITransformResponseBuilder
+    public interface IBodyResponseBuilder : IFaultResponseBuilder
     {
         /// <summary>
         /// WithBody : Create a ... response based on a string.

src/WireMock.Net/ResponseBuilders/IFaultRequestBuilder.cs

@@ -0,0 +1,18 @@
+using JetBrains.Annotations;
+
+namespace WireMock.ResponseBuilders
+{
+    /// <summary>
+    /// The FaultRequestBuilder interface.
+    /// </summary>
+    public interface IFaultResponseBuilder : ITransformResponseBuilder
+    {
+        /// <summary>
+        /// WithBody : Create a fault response.
+        /// </summary>
+        /// <param name="faultType">The FaultType.</param>
+        /// <param name="percentage">The percentage when this fault should occur. When null, it's always.</param>
+        /// <returns>A <see cref="IResponseBuilder"/>.</returns>
+        IResponseBuilder WithFault(FaultType faultType, [CanBeNull] double? percentage = null);
+    }
+}

src/WireMock.Net/ResponseBuilders/Response.WithFault.cs

@@ -0,0 +1,14 @@
+namespace WireMock.ResponseBuilders
+{
+    public partial class Response
+    {
+        /// <inheritdoc cref="IFaultResponseBuilder.WithFault(FaultType, double?)"/>
+        public IResponseBuilder WithFault(FaultType faultType, double? percentage = null)
+        {
+            ResponseMessage.FaultType = faultType;
+            ResponseMessage.FaultPercentage = percentage;
+
+            return this;
+        }
+    }
+}

src/WireMock.Net/ResponseBuilders/Response.cs

@@ -19,7 +19,7 @@ namespace WireMock.ResponseBuilders
     /// <summary>
     /// The Response.
     /// </summary>
-    public class Response : IResponseBuilder
+    public partial class Response : IResponseBuilder
     {
         private HttpClient _httpClientForProxy;
 
@@ -375,6 +375,7 @@ namespace WireMock.ResponseBuilders
         public async Task<ResponseMessage> ProvideResponseAsync(RequestMessage requestMessage, IFluentMockServerSettings settings)
         {
             Check.NotNull(requestMessage, nameof(requestMessage));
+            Check.NotNull(settings, nameof(settings));
 
             if (Delay != null)
             {