public void DownloadAsync_WhenRequestsFileBeingDownloadedAtTheMoment_WaitsForExistingRequestToFinishAndReturnsItsResult()
{
// Arrange
int delay = 2000;
IFileDownloader downloader = CreateFileDownloader(delay);
FileDownloadManager manager = new FileDownloadManager(downloader);
string file = "a file";
Task <FileResult> request1 = manager.DownloadAsync(file);
Task <FileResult> request2 = manager.DownloadAsync(file);
// Act
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
Task.WaitAll(Task.Run(async() => await request1),
Task.Run(async() => await request2));
stopwatch.Stop();
//Assert
FileResult result1 = request1.Result;
FileResult result2 = request2.Result;
int timeRatio = GetTimeRation(stopwatch, delay);
A.CallTo(() => downloader.DownloadAsync(A <string> .Ignored)).MustHaveHappenedOnceExactly();
result1.FileDownloadName.Should().Be(file);
result2.FileDownloadName.Should().Be(file);
result1.Should().BeSameAs(result2);
timeRatio.Should().Be(1);
}
public async void DownloadAsync_WhenRequestsFileAlreadyDownloaded_DownloadsIndependently()
{
// Arrange
int delay = 2000;
IFileDownloader downloader = CreateFileDownloader(delay);
FileDownloadManager manager = new FileDownloadManager(downloader);
string file = "a file";
Task <FileResult> request2 = manager.DownloadAsync(file);
// Act
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
FileResult result1 = await manager.DownloadAsync(file);
FileResult result2 = await manager.DownloadAsync(file);
stopwatch.Stop();
//Assert
int timeRatio = GetTimeRation(stopwatch, delay);
A.CallTo(() => downloader.DownloadAsync(A <string> .Ignored)).MustHaveHappenedTwiceExactly();
result1.FileDownloadName.Should().Be(file);
result2.FileDownloadName.Should().Be(file);
result1.Should().NotBeSameAs(result2);
timeRatio.Should().Be(2);
}
public void DownloadAsync_WhenRequestsTwoDifferentFilesSimultaneously_DownloadsConcurrently()
{
// Arrange
int delay = 2000;
IFileDownloader downloader = CreateFileDownloader(delay);
FileDownloadManager manager = new FileDownloadManager(downloader);
string file1 = "a file";
Task <FileResult> request1 = manager.DownloadAsync(file1);
string file2 = "another file";
Task <FileResult> request2 = manager.DownloadAsync(file2);
// Act
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
Task.WaitAll(Task.Run(async() => await request1),
Task.Run(async() => await request2));
stopwatch.Stop();
//Assert
FileResult result1 = request1.Result;
FileResult result2 = request2.Result;
int timeRatio = GetTimeRation(stopwatch, delay);
A.CallTo(() => downloader.DownloadAsync(A <string> .Ignored)).MustHaveHappenedTwiceExactly();
result1.FileDownloadName.Should().Be(file1);
result2.FileDownloadName.Should().Be(file2);
result1.Should().NotBeSameAs(result2);
timeRatio.Should().Be(1);
}
