public async Task When_downloading_fails()
{
var fileName = RandomString();
var fileUrl = RandomString();
var httpResponse = new HttpStreamResponse(500, new HttpHeaders(), new MemoryStream());
GetMock <IHttpClient>().Setup(x => x.ExecuteAsStreamAsync(IsAny <IHttpRequest>()))
.ReturnsAsync(httpResponse);
var exception = await BecauseThrowsAsync <Exception>(() => ClassUnderTest.DownloadAsync(fileUrl, fileName));
It("throws an informative exception", () =>
{
exception.ShouldNotBeNull()
.Message.ShouldBe($"Failed with status code {httpResponse.StatusCode} to download {fileName}");
});
}
internal static async Task <HttpStreamResponse> LoadHttpStreamAsync(Uri uri)
{
HttpStreamResponse response = null;
try
{
using (var responseMessage = await HttpClient.GetAsync(uri).ConfigureAwait(false))
{
if (responseMessage.IsSuccessStatusCode)
{
MemoryStream stream = null;
TimeSpan? maxAge = null;
if (ImageAvailable(responseMessage.Headers))
{
stream = new MemoryStream();
await responseMessage.Content.CopyToAsync(stream).ConfigureAwait(false);
stream.Seek(0, SeekOrigin.Begin);
maxAge = responseMessage.Headers.CacheControl?.MaxAge;
}
response = new HttpStreamResponse(stream, maxAge);
}
else
{
Debug.WriteLine("ImageLoader: {0}: {1} {2}", uri, (int)responseMessage.StatusCode, responseMessage.ReasonPhrase);
}
}
}
catch (Exception ex)
{
Debug.WriteLine("ImageLoader: {0}: {1}", uri, ex.Message);
}
return(response);
}
public async Task When_downloading()
{
var downloadsDir = RandomString();
var fileName = RandomString();
var fileUrl = RandomString();
var httpResponse = new HttpStreamResponse(200, new HttpHeaders(), new MemoryStream());
IHttpRequest?capturedHttpRequest = null;
string? capturedPath = null;
var expectedFilePath = $"{downloadsDir}\\{fileName}";
GetMock <IArguments>().SetupGet(x => x.DownloadsDir).Returns(downloadsDir);
GetMock <IHttpClient>().Setup(x => x.ExecuteAsStreamAsync(IsAny <IHttpRequest>()))
.Callback <IHttpRequest>(httpRequest => capturedHttpRequest = httpRequest)
.ReturnsAsync(httpResponse);
GetMock <IFileSystem>().Setup(x => x.WriteStreamAsync(IsAny <string>(), httpResponse.Stream))
.Callback <string, Stream>((path, _) => capturedPath = path);
var downloadedFilePath = await BecauseAsync(() => ClassUnderTest.DownloadAsync(fileUrl, fileName));
It("downloads the required file", () =>
{
capturedHttpRequest.ShouldNotBeNull().ShouldSatisfyAllConditions(x =>
{
x.Url.ShouldBe(fileUrl);
x.Method.ShouldBe(HttpMethod.GET);
});
capturedPath.ShouldBe(expectedFilePath);
});
It("returns the path to the downloaded file", () =>
{
downloadedFilePath.ShouldBe(expectedFilePath);
});
}
