CSHARP-797: Change unit tests affected by server version 2.6.0-rc2.

Author: rstam

MongoDB.DriverUnitTests/MongoCollectionTests.cs

@@ -2171,20 +2171,6 @@ public void TestInsertBatchSmallFinalSubbatch()
             }
         }
 
-        [Test]
-        public void TestInsertBatchZeroDocuments()
-        {
-            if (_primary.BuildInfo.Version >= new Version(2, 5, 5))
-            {
-                _collection.Drop();
-                var results = _collection.InsertBatch(new BsonDocument[0]);
-                var expectedResult = new ExpectedWriteConcernResult();
-                CheckExpectedResult(expectedResult, results.Single());
-
-                Assert.AreEqual(0, _collection.Count());
-            }
-        }
-
         [Test]
         public void TestInsertDuplicateKey()
         {

MongoDB.DriverUnitTests/Operations/BulkWriteOperationTests.cs

@@ -800,25 +800,28 @@ public void TestUpdateUpdatesAllMatchingDocuments(bool ordered)
         [TestCase(true)]
         public void TestUpsertOneVeryLargeDocument(bool ordered)
         {
-            _collection.Drop();
+            if (_primary.BuildInfo.Version >= new Version(2, 6, 0))
+            {
+                _collection.Drop();
 
-            var bulk = InitializeBulkOperation(_collection, ordered);
-            var bigString = new string('x', 16 * 1024 * 1024 - 30);
-            bulk.Find(Query.EQ("key", 1)).Upsert().Update(Update.Set("x", bigString));
-            var result = bulk.Execute();
+                var bulk = InitializeBulkOperation(_collection, ordered);
+                var bigString = new string('x', 16 * 1024 * 1024 - 22);
+                bulk.Find(Query.EQ("_id", 1)).Upsert().Update(Update.Set("x", bigString)); // resulting document will be exactly 16MiB
+                var result = bulk.Execute();
 
-            var expectedResult = new ExpectedResult
-            {
-                UpsertsCount = 1,
-                IsModifiedCountAvailable = _primary.Supports(FeatureId.WriteCommands)
-            };
-            CheckExpectedResult(expectedResult, result);
+                var expectedResult = new ExpectedResult
+                {
+                    UpsertsCount = 1,
+                    IsModifiedCountAvailable = _primary.Supports(FeatureId.WriteCommands)
+                };
+                CheckExpectedResult(expectedResult, result);
 
-            var expectedDocuments = new BsonDocument[]
-            {
-                new BsonDocument { { "key", 1 }, { "x", bigString } }
-            };
-            Assert.That(_collection.FindAll().SetFields(Fields.Exclude("_id")), Is.EquivalentTo(expectedDocuments));
+                var expectedDocuments = new BsonDocument[]
+                {
+                    new BsonDocument { { "_id", 1 }, { "x", bigString } }
+                };
+                Assert.That(_collection.FindAll(), Is.EquivalentTo(expectedDocuments));
+            }
         }
 
         [Test]