private void Button_should_be_disabled_when_text_and_query_are_empty()
        {
          var mockTextMatchingEngine = new Mock<ITextMatchingEngine>();

          var viewModel = new TextMatcherViewModel(mockTextMatchingEngine.Object);
          Assert.False(viewModel.IsButtonEnabled);
        } 
 public TextMatcherView(TextMatcherViewModel viewModel)
 {
     InitializeComponent();
     this.DataContext = viewModel;
 }