public void FromCanceled_ReturnsCanceledOperation_Generic()
{
// Act
var op = AsyncResult.FromCanceled <int>();
// Assert
AssertCanceled(op);
Assert.True(op.CompletedSynchronously);
}
public async Task ToTask_FailsWhenSourceIsCanceled()
{
// Arrange
var op = AsyncResult.FromCanceled();
var task = op.ToTask();
// Act/Assert
await Assert.ThrowsAsync <TaskCanceledException>(() => task);
}
public async Task Unwrap_FailsIfOuterOperationFails()
{
// Arrange
var actualException = default(Exception);
var op1 = AsyncResult.FromCanceled <AsyncResult>();
var op = op1.Unwrap();
// Act
try
{
await op;
}
catch (OperationCanceledException e)
{
actualException = e;
}
// Assert
Assert.True(op.IsCanceled);
Assert.NotNull(actualException);
}
public async Task ContinueWth_ExecutesOnAntecedentCancellation(AsyncContinuationOptions options, bool expectedCalled)
{
// Arrange
var op = AsyncResult.FromCanceled();
var continuationCalled = false;
var continuationCanceled = false;
var continuation = op.ContinueWith(o => continuationCalled = true, options);
// Act
try
{
await continuation;
}
catch (OperationCanceledException)
{
continuationCanceled = true;
}
// Assert
Assert.Equal(expectedCalled, continuationCalled);
Assert.Equal(!expectedCalled, continuationCanceled);
}
