public async Task DropNewFramesIfPreviousOneIsStillInProgress()
{
var inputImage = new Image <Rgb, byte>(1, 1);
var expectedImage = new Image <Rgb, byte>(10, 10);
strategy.Setup(s => s.Denoise(inputImage)).Returns(() => {
Task.Delay(TimeSpan.FromMilliseconds(900)).Wait();
return(expectedImage);
});
var denoiser = new DenoisingStream(strategy.Object, new Counter(), CancellationToken.None, logger.Object);
var observer = new TestImageObserver <Rgb>();
using (denoiser.Subscribe(observer))
{
var _ = Task.Run(() => denoiser.Process(inputImage));
_ = Task.Run(() => denoiser.Process(inputImage));
_ = Task.Run(() => denoiser.Process(inputImage));
_ = Task.Run(() => denoiser.Process(inputImage));
await Task.Delay(TimeSpan.FromMilliseconds(1300));
}
Assert.Single(observer.ReceivedItems);
}
public async Task ProvideDataForObservers()
{
var inputImage = new Image <Rgb, byte>(1, 1);
var expectedImages = new List <Image <Rgb, byte> >();
var i = 0;
strategy.Setup(s => s.Denoise(inputImage)).Returns(() =>
{
var value = new Image <Rgb, byte>(++i, 1);
expectedImages.Add(value);
return(value);
});
var denoiser = new DenoisingStream(strategy.Object, new Counter(), CancellationToken.None, logger.Object);
var observer = new TestImageObserver <Rgb>();
using (denoiser.Subscribe(observer))
{
denoiser.Process(inputImage);
await Task.Delay(TimeSpan.FromMilliseconds(100));
denoiser.Process(inputImage);
await Task.Delay(TimeSpan.FromMilliseconds(100));
}
Assert.Equal(2, observer.ReceivedItems.Count);
Assert.Equal(expectedImages[0], observer.ReceivedItems.Keys.First());
Assert.Equal(expectedImages[1], observer.ReceivedItems.Keys.Skip(1).First());
}
public async Task CompleteStreamIfErrorOccurred()
{
var inputImage = new Image <Rgb, byte>(1, 1);
strategy.Setup(s => s.Denoise(inputImage)).Throws <TestException>();
var denoiser = new DenoisingStream(strategy.Object, new Counter(), CancellationToken.None, logger.Object);
var observer = new TestImageObserver <Rgb>();
using (denoiser.Subscribe(observer))
{
denoiser.Process(inputImage);
await Task.Delay(TimeSpan.FromMilliseconds(100));
}
Assert.IsType <TestException>(observer.Error);
Assert.True(observer.StreamCompleted);
}
public async Task NotProvideDataForObserversAfterCompletion()
{
var inputImage = new Image <Rgb, byte>(1, 1);
var expectedImage = new Image <Rgb, byte>(10, 10);
strategy.Setup(s => s.Denoise(inputImage)).Returns(expectedImage);
var denoiser = new DenoisingStream(strategy.Object, new Counter(), CancellationToken.None, logger.Object);
var observer = new TestImageObserver <Rgb>();
using (denoiser.Subscribe(observer))
{
denoiser.Complete();
denoiser.Process(inputImage);
await Task.Delay(TimeSpan.FromMilliseconds(100));
}
Assert.Empty(observer.ReceivedItems);
}