public void Should_create_a_filestream() { var captureWebPage = new CaptureWebPage(Ie); try { var stream = captureWebPage.CreateFileStream(@"c:\capture_image_test.jpg"); Assert.That(stream, Is.Not.Null, "Expected a return value"); Assert.That(stream as FileStream, Is.Not.Null, "Expected a FileStream instance"); Assert.That(((FileStream)stream).Name, Is.EqualTo(@"c:\capture_image_test.jpg")); } catch (UnauthorizedAccessException ex) { Assert.That(ex.Message, Does.Contain(@"c:\capture_image_test.jpg")); } }