CSHARP-5392: Add integration tests for transactions write concern behavior

tests/MongoDB.Driver.Tests/Specifications/transactions/TransactionsProseTests.cs

@@ -0,0 +1,73 @@
+/* Copyright 2010-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;
+using FluentAssertions;
+using MongoDB.Bson;
+using MongoDB.Driver.Core.Clusters;
+using MongoDB.Driver.Core.TestHelpers.XunitExtensions;
+using MongoDB.TestHelpers.XunitExtensions;
+using Xunit;
+
+namespace MongoDB.Driver.Tests.Specifications.transactions
+{
+    [Trait("Category", "Integration")]
+    public class TransactionsProseTests
+    {
+        private string _collectionName = "txn-test-col";
+        private string _databaseName = "txn-test";
+
+        // https://github.com/mongodb/specifications/blob/fc7996db26d0ea92091a5034c6acb287ef7282fe/source/transactions/tests/README.md#10-write-concern-not-inherited-from-collection-object-inside-transaction
+        [Theory]
+        [ParameterAttributeData]
+        public async void Ensure_write_concern_is_not_inherited_from_collection_object_inside_transaction([Values(false, true)] bool async)
+        {
+            RequireServer.Check().ClusterTypes(ClusterType.LoadBalanced, ClusterType.ReplicaSet, ClusterType.Sharded);
+
+            using var client = DriverTestConfiguration.CreateMongoClient();
+            var database = client.GetDatabase(_databaseName).WithWriteConcern(WriteConcern.WMajority);
+            database.DropCollection(_collectionName);
+
+            var collection = client.GetDatabase(_databaseName).GetCollection<BsonDocument>(_collectionName)
+                .WithWriteConcern(WriteConcern.Unacknowledged);
+
+            Exception exception;
+            using (var session = client.StartSession())
+            {
+                session.StartTransaction();
+
+                if (async)
+                {
+                    exception = await Record.ExceptionAsync( async () =>
+                    {
+                        await collection.InsertOneAsync(new BsonDocument("n", 1));
+                        await session.CommitTransactionAsync();
+                    });
+                }
+                else
+                {
+                    exception = Record.Exception(() =>
+                    {
+                        collection.InsertOne(new BsonDocument("n", 1));
+                        session.CommitTransaction();
+                    });
+                }
+            }
+
+            exception.Should().BeNull();
+            collection.Find(new BsonDocument("n", 1)).First().Should().NotBeNull().And.Subject["n"].AsInt32.Should().Be(1);
+        }
+    }
+}