public async Task <IFileItem> WriteTestFile(string extension = "txt", string path = null) { string filePath; if (path != null) { filePath = path; } else { filePath = ImportTestPath; } string testFileName = string.Format("{0}.{1}", Guid.NewGuid(), extension); string testFilePath = filePath + "/" + testFileName; var file = RootFolder.GetFileReference(testFilePath, true); await file.WriteAsync(new byte[] { 0, 1, 2, 3 }); return(file); }