public void Merge() { // Only test a simple case here and expect // {@link FieldMaskTreeTest#Merge} to cover all scenarios. FieldMask fieldMask = FieldMask.FromString("payload"); NestedTestAllTypes source = new NestedTestAllTypes { Payload = new TestAllTypes { SingleInt32 = 1234, SingleFixed64 = 4321 } }; NestedTestAllTypes destination = new NestedTestAllTypes(); fieldMask.Merge(source, destination); Assert.AreEqual(1234, destination.Payload.SingleInt32); Assert.AreEqual(4321, destination.Payload.SingleFixed64); destination = new NestedTestAllTypes { Payload = new TestAllTypes { SingleInt32 = 4321, SingleInt64 = 5678 } }; fieldMask.Merge(source, destination); Assert.AreEqual(1234, destination.Payload.SingleInt32); Assert.AreEqual(5678, destination.Payload.SingleInt64); Assert.AreEqual(4321, destination.Payload.SingleFixed64); }