public void SendMessage_ServiceClient_IsCalled()
        {
            var message = new Message {
                Text = "text", SenderId = Guid.NewGuid()
            };

            _serviceClient.SendMessage(message.Text, message.SenderId).Returns(message.Text.Length);

            _messageProcessor.SendMessage(message);

            _serviceClient.Received().SendMessage(message.Text, message.SenderId);
        }