private void VerifyMessageProcessing(Type handlerType, Type messageType) { _messageBusInitializer.MessageHandlerResolverMock.Received(1).Resolve(handlerType); TestHandlerBase.ArgsReceived.Count.Should().Be(1); var arg = TestHandlerBase.ArgsReceived.First(); AssertionExtensions.ShouldBeEquivalentTo(arg.GetType(), messageType); }