public async Task Cancel_ShouldCancel_PendingAndRunningTasks()
{
// Arrange
using (var breakpoint = new Breakpoint())
{
var queue = new CoalescingTaskQueue <int, int>((newArg, arg, running) =>
CoalesceDecision.None);
async Task <int> TestAction(int result, CancellationToken ct)
{
// ReSharper disable once AccessToDisposedClosure
await breakpoint.Hit().WaitForContinue();
ct.ThrowIfCancellationRequested();
return(result);
}
// Act
var task1 = queue.Enqueue(ct => TestAction(6517, ct), 6517);
var hit1 = await breakpoint.WaitForHit().TimeoutAfter(TestTimeout);
var task2 = queue.Enqueue(ct => TestAction(101, ct), 101);
queue.Cancel();
hit1.Continue();
await Task.WhenAny(task1);
// Assert
task1.IsCanceled.Should().BeTrue();
task2.IsCanceled.Should().BeTrue();
}
}
public async Task Enqueue_ShouldNotJoin_CancelledRunningTask()
{
// Arrange
const int expected = 6874;
using (var breakpoint = new Breakpoint())
{
var queue = new CoalescingTaskQueue <int, int>((newArg, arg, running) =>
CoalesceDecision.Join);
async Task <int> TestAction(int result, CancellationToken ct)
{
// ReSharper disable once AccessToDisposedClosure
await breakpoint.Hit().WaitForContinue();
ct.ThrowIfCancellationRequested();
return(result);
}
// Act
_ = queue.Enqueue(ct => TestAction(1981, ct), 1981);
var hit1 = await breakpoint.WaitForHit().TimeoutAfter(TestTimeout);
queue.Cancel();
var task2 = queue.Enqueue(ct => TestAction(expected, ct), expected);
hit1.Continue();
await breakpoint.WaitForHitAndContinue().TimeoutAfter(TestTimeout);
// Assert
task2.Result.Should().Be(expected);
}
}
public void Cancel_ShouldSucceed_WhenNoTasksRunning()
{
// Arrange
var queue = new CoalescingTaskQueue <int, int>((newArg, arg, running) =>
CoalesceDecision.None);
// Act
Action action = () => queue.Cancel();
// Assert
action.Should().NotThrow();
}
