Fix response factory to allow setting success (#54)

Author: stevejgordon

src/Elastic.Transport/Responses/ResponseFactory.cs

@@ -0,0 +1,41 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+namespace Elastic.Transport;
+
+/// <summary>
+/// A factory used to configure responses that can be used for unit testing.
+/// </summary>
+public static class TestableResponseFactory
+{
+	/// <summary>
+	/// Creates a response suitable for testing which includes the provided HTTP status code and is marked as successful.
+	/// </summary>
+	/// <param name="response">The <see cref="TransportResponse"/> to configure.</param>
+	/// <param name="httpStatusCode">The HTTP status code to set on the final response.</param>
+	/// <typeparam name="T">The response derived from <see cref="TransportResponse"/> that will be returned.</typeparam>
+	/// <returns>The <typeparamref name="T"/> response configured as a successful server response with the provided status code.</returns>
+	public static T CreateSuccessfulResponse<T>(T response, int httpStatusCode) where T : TransportResponse
+		=> CreateResponse(response, httpStatusCode, true);
+
+	/// <summary>
+	/// Creates a response suitable for testing which includes the provided HTTP status code and is marked as successful.
+	/// </summary>
+	/// <typeparam name="T">The response derived from <see cref="TransportResponse"/> that will be returned.</typeparam>
+	/// <param name="response">The <see cref="TransportResponse"/> to configure.</param>
+	/// <param name="httpStatusCode">The HTTP status code to set on the final response.</param>
+	/// <param name="statusCodeRepresentsSuccess">Control whether the provided HTTP status code should be considered a success for this response.</param>
+	/// <returns>The <typeparamref name="T"/> response configured with the provided status code where <see cref="ApiCallDetails.HasSuccessfulStatusCode"/> will be set using <paramref name="statusCodeRepresentsSuccess"/>.</returns>
+	public static T CreateResponse<T>(T response, int httpStatusCode, bool statusCodeRepresentsSuccess) where T : TransportResponse
+	{
+		var apiCallDetails = new ApiCallDetails { HttpStatusCode = httpStatusCode, HasSuccessfulStatusCode = statusCodeRepresentsSuccess };
+		return CreateResponse<T>(response, apiCallDetails);
+	}
+
+	internal static T CreateResponse<T>(T response, ApiCallDetails apiCallDetails) where T : TransportResponse
+	{
+		response.ApiCallDetails = apiCallDetails;
+		return response;
+	}
+}