//called before each test method
public PrimesViewModelTest()
{
primesModelMock.Setup(pm => pm.CountAsync(1000)).ReturnsAsync(168);
primesModelMock.Setup(pm => pm.CountAsync(1000000)).ReturnsAsync(78498);
viewModel = new PrimesViewModel(primesModelMock.Object);
//add a delegate instance to the ViewModel's PropertyChanged event to enable tracking
((INotifyPropertyChanged)viewModel).PropertyChanged +=
(object sender, PropertyChangedEventArgs e) => { eventRaised = true; eventArgs = e; };
}
public void StartButton_ShouldCallCountMethodOfPrimesModel()
{
//arrange
Mock <IPrimesModel> primesModelMock = new Mock <IPrimesModel>();
PrimesViewModel viewModel = new PrimesViewModel(primesModelMock.Object);
// Act
viewModel.StartCommand.Execute(null);
// Assert
primesModelMock.Verify(pm => pm.CountAsync(It.IsAny <int>()));
}
public void LimitProperty_SetTo1000_ShouldCallCountAsyncMethodOfPrimesModel()
{
//arrange
Mock <IPrimesModel> primesModelMock = new Mock <IPrimesModel>();
PrimesViewModel viewModel = new PrimesViewModel(primesModelMock.Object);
//act
viewModel.Limit = 1000;
//assert
primesModelMock.Verify(pm => pm.CountAsync(1000));
}
public void LimitProperty_SetTo1000_ResultPropertyShouldContain168()
{
//arrange
Mock <IPrimesModel> primesModelMock = new Mock <IPrimesModel>();
primesModelMock.Setup(pm => pm.CountAsync(1000)).ReturnsAsync(168);
primesModelMock.Setup(pm => pm.CountAsync(1000000)).ReturnsAsync(78498);
PrimesViewModel viewModel = new PrimesViewModel(primesModelMock.Object);
//act
viewModel.Limit = 1000;
//assert
Assert.Contains("168", viewModel.Result);
}
public void StartButton_WhenLimitIs1000_ResultPropertyContains168()
{
//arrange
Mock <IPrimesModel> primesModelMock = new Mock <IPrimesModel>();
primesModelMock.Setup(pm => pm.CountAsync(1000)).ReturnsAsync(168);
primesModelMock.Setup(pm => pm.CountAsync(1000000)).ReturnsAsync(78498);
PrimesViewModel viewModel = new PrimesViewModel(primesModelMock.Object);
viewModel.Limit = 1000;
viewModel.Result = null;
// Act
viewModel.StartCommand.Execute(null);
// Assert
Assert.Contains("168", viewModel.Result);
}
public void ResultProperty_ShouldRaiseEventNamedResult()
{
//arrange
Mock <IPrimesModel> primesModelMock = new Mock <IPrimesModel>();
PrimesViewModel viewModel = new PrimesViewModel(primesModelMock.Object);
//add a delegate instance to the ViewModel's PropertyChanged event to enable tracking
bool eventRaised = false;
PropertyChangedEventArgs eventArgs = null;
((INotifyPropertyChanged)viewModel).PropertyChanged +=
(object sender, PropertyChangedEventArgs e) => { eventRaised = true; eventArgs = e; };
// Act
viewModel.Result = "168";
// Assert
Assert.True(eventRaised);
Assert.Equal("Result", eventArgs.PropertyName);
}
public PrimesView(PrimesViewModel viewModel)
{
InitializeComponent();
DataContext = viewModel;
}
