public void AmountOfCharactersRemainingIsAsExpected(string message, int charactersRemaining)
        {
            var sut = new ComposeTweetViewModelBuilder()
                      .WithMessage(message)
                      .Build();

            sut.CharactersRemaining.ShouldBe(charactersRemaining);
        }
        public void CanSendTweetIfMessageIsNotBlank(string message)
        {
            var sut = new ComposeTweetViewModelBuilder()
                      .WithMessage(message)
                      .Build();

            var canSend = sut.Send.CanExecute.FirstAsync().Wait();

            canSend.ShouldBe(true);
        }