public async void IsLoadingEventShouldTriggerTwice()
{
// Arrange
var triggerCount = 0;
var loader = new Loader(new Mock<IDialogService>().Object);
loader.LoadingChanged += (sender, args) => ++triggerCount;
// Act
await loader.LoadAsync(token => Task.FromResult<object>(null));
// Assert
Assert.AreEqual(2, triggerCount);
}
public async void CancelledTaskDoesNotShowDialog()
{
// Arrange
var dialogService = new Mock<IDialogService>();
dialogService.Setup(d => d.ShowMessageAsync(It.IsAny<string>()));
var tcs = new TaskCompletionSource<object>();
tcs.SetCanceled();
var loader = new Loader(dialogService.Object);
// Act
await loader.LoadAsync(token => tcs.Task);
// Assert
dialogService.Verify(s => s.ShowMessageAsync(It.IsAny<string>()), Times.Never);
}
public async void FailedTaskShowsDialog()
{
// Arrange
var dialogService = new Mock<IDialogService>();
dialogService.Setup(d => d.ShowMessageAsync(It.IsAny<string>())).Returns(Task.FromResult<object>(null));
const string failedMessage = "Failed";
var tcs = new TaskCompletionSource<object>();
tcs.SetException(new Exception(failedMessage));
var loader = new Loader(dialogService.Object);
// Act
await loader.LoadAsync(token => tcs.Task);
// Assert
dialogService.Verify(s => s.ShowMessageAsync(failedMessage), Times.Once);
}