public static async Task <TestData> CreateFiles(int nbFiles, int sizeKb, string folder) { foreach (var _ in Enumerable.Range(0, nbFiles)) { await TestFileHelper.NewFile(folder, sizeKb); } await Task.Delay(150); // for filesystem latency return(new TestData { Directories = new List <DirectoryInfo> { new DirectoryInfo(folder) } }); }