CSHARP-915: added MaxWriteBatchSize to IsMasterResult

Author: craiggwilson

MongoDB.Driver/CommandResults/IsMasterResult.cs

@@ -161,6 +161,17 @@ public int MinWireVersion
             get { return Response.GetValue("minWireVersion", 0).ToInt32(); }
         }
 
+        /// <summary>
+        /// Gets the maximum size of the write batch.
+        /// </summary>
+        /// <value>
+        /// The maximum size of the write batch.
+        /// </value>
+        public int MaxWriteBatchSize
+        {
+            get { return Response.GetValue("maxWriteBatchSize", 1000).ToInt32(); }
+        }
+
         /// <summary>
         /// Gets the message.
         /// </summary>

MongoDB.DriverUnitTests/CommandResults/IsMasterResultTests.cs

@@ -62,5 +62,30 @@ public void TestMaxMessageLengthWhenNotServerSuppliedUsesMaxBsonObjectSizeWhenLa
 
             Assert.AreEqual(MongoDefaults.MaxMessageLength + 1024, result.MaxMessageLength);
         }
+
+        [Test]
+        public void TestMaxWriteBatchSizeWhenServerSupplied()
+        {
+            var document = new BsonDocument
+            {
+                { "ok", 1 },
+                { "maxWriteBatchSize", 200 }
+            };
+            var result = new IsMasterResult(document);
+
+            Assert.AreEqual(200, result.MaxWriteBatchSize);
+        }
+
+        [Test]
+        public void TestMaxWriteBatchSizeWhenNotServerSupplied()
+        {
+            var document = new BsonDocument
+            {
+                { "ok", 1 }
+            };
+            var result = new IsMasterResult(document);
+
+            Assert.AreEqual(1000, result.MaxWriteBatchSize);
+        }
     }
 }