public async Task LogErrorIfNullMatReceivedFromObservable()
{
logger
.Setup(
l => l.Log(
LogLevel.Error,
It.IsAny <EventId>(),
It.Is <It.IsSubtype <IReadOnlyList <KeyValuePair <string, object> > > >((x, _) => x.ToString().Contains("null image received")),
It.Is <Exception>((e, _) => e == null),
It.IsAny <Func <It.IsSubtype <IReadOnlyList <KeyValuePair <string, object> > >, Exception, string> >()))
.Verifiable("Logger was not called!");
var observer = new RawImageObserver <Rgb>(logger.Object);
var _ = Task.Run(async() =>
{
await Task.Delay(TimeSpan.FromMilliseconds(110));
observer.OnNext(null);
});
try
{
await observer.GetImage();
}
catch (Exception)
{
// ignored - it's expected that GetImage will throw an exception, but this test checks that logger was called before that
}
logger.Verify();
}
public async Task ReturnNullIfOnCompletedReceived()
{
var observer = new RawImageObserver <Rgb>(logger.Object);
var _ = Task.Run(async() =>
{
await Task.Delay(TimeSpan.FromMilliseconds(110));
observer.OnCompleted();
});
var result = await observer.GetImage();
Assert.Null(result);
}
public async Task ThrowInvalidOperationExceptionIfNullMatReceivedFromObservable()
{
var observer = new RawImageObserver <Rgb>(logger.Object);
var _ = Task.Run(async() =>
{
await Task.Delay(TimeSpan.FromMilliseconds(110));
observer.OnNext(null);
});
await Assert.ThrowsAsync <InvalidOperationException>(async() =>
{
await observer.GetImage();
});
}
public async Task ThrowIOExceptionOnError()
{
var observer = new RawImageObserver <Rgb>(logger.Object);
var _ = Task.Run(async() =>
{
await Task.Delay(TimeSpan.FromMilliseconds(110));
observer.OnError(new TestException());
});
await Assert.ThrowsAsync <IOException>(async() =>
{
await observer.GetImage();
});
}
public async Task ReturnImageOnceItWasObserved()
{
var expectedFrame = new Mat(new Size(100, 100), DepthType.Cv32F, 3);
Image <Rgb, byte> expectedImage = expectedFrame.ToImage <Rgb, byte>();
var expectedJpeg = expectedImage.ToJpegData();
var observer = new RawImageObserver <Rgb>(logger.Object);
var _ = Task.Run(async() =>
{
await Task.Delay(TimeSpan.FromMilliseconds(110));
observer.OnNext(expectedImage);
});
var image = await observer.GetImage();
var actualJpeg = image.ToJpegData();
Assert.Equal(expectedJpeg, actualJpeg);
}
