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Using a Func<Task> may be a better option

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Tracy Pearson
2022-08-30 10:56:23 -04:00
parent b58a74709e
commit 3084a49bdd
5 changed files with 39 additions and 20 deletions
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31
WpfViewModelFirst.Tests/MainWindowViewModelTests.cs
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@@ -9,26 +9,45 @@ namespace WpfViewModelFirst.Tests
[Fact]
public void Part1WillSetPart1ViewModelToCurrentViewModel()
{
Part1ViewModel part1ViewModel = new(() => _ = true);
Part1ViewModel part1ViewModel = new(() => Task.CompletedTask);
Mock<IViewModelFactory> mockViewModelFactory = new Mock<IViewModelFactory>();
mockViewModelFactory.Setup(vmf => vmf.GetPart1ViewModel(It.IsAny<Action>()))
mockViewModelFactory.Setup(vmf => vmf.GetPart1ViewModel(It.IsAny<Func<Task>>()))
.Returns(part1ViewModel);
MainWindowViewModel main = new(mockViewModelFactory.Object);
main.Part1(null);
Assert.Equal(part1ViewModel, main.CurrentViewModel);
}
[Fact]
public void Part1CallbackIsSuccessfull()
public async Task Part1CallbackIsSuccessfull()
{
TaskCompletionSource<bool> taskCompletionSource = new TaskCompletionSource<bool>();
Mock<IViewModelFactory> mockViewModelFactory = new Mock<IViewModelFactory>();
mockViewModelFactory.Setup(vmf => vmf.GetPart1ViewModel(It.IsAny<Action>()))
.Returns(() => new Part1ViewModel(() => Task.Delay(0)))
.Callback<Action>(c => c.Invoke());
mockViewModelFactory.Setup(vmf => vmf.GetPart1ViewModel(It.IsAny<Func<Task>>()))
.Returns(() => new Part1ViewModel(() =>
{
taskCompletionSource.SetResult(true);
return Task.CompletedTask;
}))
.Callback<Func<Task>>(c =>
{
c.Invoke().ContinueWith(t =>
{
taskCompletionSource.SetResult(true);
});
})
;
mockViewModelFactory.Setup(vmf => vmf.GetPart2ViewModel())
.Returns(() => new Part2ViewModel());
MainWindowViewModel main = new(mockViewModelFactory.Object);
main.Part1(null);
await taskCompletionSource.Task.WaitAsync(CancellationToken.None);
Assert.IsType<Part2ViewModel>(main.CurrentViewModel);
}
Func<Task> Part1Func()
{
return () => Task.CompletedTask;
}
}
}