CSHARP-3391: Implement change stream oplog parsing code for delta oplog entries. (#472)

Author: DmitryLukyanov

tests/MongoDB.Driver.Tests/Specifications/change-streams/ChangeStreamTestRunner.cs

@@ -569,7 +569,7 @@ protected override string PathPrefix
             {
                 get
                 {
-                    return "MongoDB.Driver.Tests.Specifications.change_streams.tests.";
+                    return "MongoDB.Driver.Tests.Specifications.change_streams.tests.legacy.";
                 }
             }
 

tests/MongoDB.Driver.Tests/Specifications/change-streams/ChangeStreamUnifiedTestRunner.cs

@@ -0,0 +1,57 @@
+/* Copyright 2021-present MongoDB Inc.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System.Collections.Generic;
+using MongoDB.Bson;
+using MongoDB.Bson.TestHelpers.JsonDrivenTests;
+using MongoDB.Driver.Tests.Specifications.unified_test_format;
+using Xunit;
+
+namespace MongoDB.Driver.Tests.Specifications.crud.Unified
+{
+    public sealed class ChangeStreamUnifiedTestRunner
+    {
+        [SkippableTheory]
+        [ClassData(typeof(TestCaseFactory))]
+        public void Run(JsonDrivenTestCase testCase)
+        {
+            using (var runner = new UnifiedTestFormatTestRunner())
+            {
+                runner.Run(testCase);
+            }
+        }
+
+        // nested types
+        public class TestCaseFactory : JsonDrivenTestCaseFactory
+        {
+            // protected properties
+            protected override string PathPrefix => "MongoDB.Driver.Tests.Specifications.change_streams.tests.unified.";
+
+            // protected methods
+            protected override IEnumerable<JsonDrivenTestCase> CreateTestCases(BsonDocument document)
+            {
+                foreach (var testCase in base.CreateTestCases(document))
+                {
+                    foreach (var async in new[] { false, true })
+                    {
+                        var name = $"{testCase.Name}:async={async}";
+                        var test = testCase.Test.DeepClone().AsBsonDocument.Add("async", async);
+                        yield return new JsonDrivenTestCase(name, testCase.Shared, test);
+                    }
+                }
+            }
+        }
+    }
+}