IObservable <byte[]> DownloadImage(Uri url)
{
return(ImageDownloader.DownloadImageBytes(url)
.SelectMany(x => x == null
? Observable.Empty <byte[]>()
: Observable.Return(x)));
}
public void NotFoundTwiceForSameHost_CouldNotDownloadExceptionMessage()
{
var host = "flaky404.githubusercontent.com";
var url = new Uri("https://" + host + "/u/00000000?v=4");
var expectMessage = ImageDownloader.CouldNotDownloadExceptionMessage(url);
var httpClient = Substitute.For <IHttpClient>();
var response = Substitute.For <IResponse>();
response.StatusCode.Returns(HttpStatusCode.NotFound);
httpClient.Send(null, default(CancellationToken)).ReturnsForAnyArgs(Task.FromResult(response));
var target = new ImageDownloader(new Lazy <IHttpClient>(() => httpClient));
var ex1 = Assert.CatchAsync <HttpRequestException>(async() => await target.DownloadImageBytes(url));
var ex2 = Assert.CatchAsync <HttpRequestException>(async() => await target.DownloadImageBytes(url));
Assert.That(ex1?.Message, Is.EqualTo(expectMessage));
Assert.That(ex2?.Message, Is.EqualTo(expectMessage));
}
public void NonImageContentForSameHost_ThrowsCachedHttpRequestException()
{
var host = "host";
var url = new Uri("https://" + host + "/image");
var contentType = "text/html";
var expectMessage1 = ImageDownloader.NonImageContentExceptionMessage(contentType);
var expectMessage2 = ImageDownloader.CachedExceptionMessage(host);
var httpClient = Substitute.For <IHttpClient>();
var response = Substitute.For <IResponse>();
response.StatusCode.Returns(HttpStatusCode.OK);
response.ContentType.Returns(contentType);
httpClient.Send(null, default(CancellationToken)).ReturnsForAnyArgs(Task.FromResult(response));
var target = new ImageDownloader(new Lazy <IHttpClient>(() => httpClient));
var ex1 = Assert.CatchAsync <HttpRequestException>(async() => await target.DownloadImageBytes(url));
var ex2 = Assert.CatchAsync <HttpRequestException>(async() => await target.DownloadImageBytes(url));
Assert.That(ex1?.Message, Is.EqualTo(expectMessage1));
Assert.That(ex2?.Message, Is.EqualTo(expectMessage2));
}
public void HttpStatusCode_NotFound404_ThrowsHttpRequestException()
{
var url = new Uri("http://foo.bar");
var httpClient = Substitute.For <IHttpClient>();
var response = Substitute.For <IResponse>();
response.StatusCode.Returns(HttpStatusCode.NotFound);
httpClient.Send(null, default(CancellationToken)).ReturnsForAnyArgs(Task.FromResult(response));
var target = new ImageDownloader(new Lazy <IHttpClient>(() => httpClient));
Assert.ThrowsAsync <HttpRequestException>(async() => await target.DownloadImageBytes(url));
}
public void ContentTypeText_ThrowsHttpRequestException()
{
var url = new Uri("http://foo.bar");
var httpClient = Substitute.For <IHttpClient>();
var response = Substitute.For <IResponse>();
response.StatusCode.Returns(HttpStatusCode.OK);
response.ContentType.Returns("text/plain");
response.Body.Returns(Array.Empty <byte>());
httpClient.Send(null, default(CancellationToken)).ReturnsForAnyArgs(Task.FromResult(response));
var target = new ImageDownloader(new Lazy <IHttpClient>(() => httpClient));
Assert.ThrowsAsync <NonImageContentException>(async() => await target.DownloadImageBytes(url));
}
public async Task HttpStatusCode_OK_Async()
{
var url = new Uri("http://foo.bar");
var httpClient = Substitute.For <IHttpClient>();
var response = Substitute.For <IResponse>();
response.StatusCode.Returns(HttpStatusCode.OK);
response.ContentType.Returns("image/xxx");
response.Body.Returns(Array.Empty <byte>());
httpClient.Send(null, default(CancellationToken)).ReturnsForAnyArgs(Task.FromResult(response));
var target = new ImageDownloader(new Lazy <IHttpClient>(() => httpClient));
var bytes = await target.DownloadImageBytes(url);
Assert.IsEmpty(bytes);
}