Question

我正在研究.Net Core Web API应用程序。我的控制器上有以下方法：

[HttpGet]
public async Task<IActionResult> GetArtists()
{
  var permissions = await _permissionsService.GetPermissionsAsync(HttpContext);
  var artists = _artistsService.GetAllArtists(permissions.UserId, permissions.IsAdministrator);
  return Ok( new { artists });
}

我想写一个测试，断言我确实得到了200 OK结果。

我尝试了以下内容：

[TestMethod]
public void GetArtists_ReturnsOKStatusCode()
{
  // arrange
  var artistsController = new ArtistsController(_mockPermissionsService.Object, _mockArtistsService.Object, _mockLogger.Object);
  // act
  var getArtistsResult = artistsController.GetArtists();
  var okResult = getArtistsResult as OkObjectResult;

  Assert.IsInstanceOfType(okResult, OkObjectResult)
}

但是在我投射到OkObjectResult的行上我收到错误。它说我无法将类型Task<IActionResult>转换为OkObjectResult

Answer 1

调用异步方法时需要使用await：

var getArtistsResult = await artistsController.GetArtists();

这反过来使您的测试方法async Task：

[TestMethod]
public async Task GetArtists_ReturnsOKStatusCode()
{
  ...
}

Answer 2

您需要接收函数GetArtists（）（不是Task）的结果，如下所示：

var getArtistsResult = artistsController.GetArtists().Result;

然后你可以将它转换为OkObjectResult。

或者您可以尝试更改您的测试：

[TestMethod]
public async Task GetArtists_ReturnsOKStatusCode()
{
  // arrange
  var artistsController = new ArtistsController(_mockPermissionsService.Object, _mockArtistsService.Object, _mockLogger.Object);
  // act
  var getArtistsResult = await artistsController.GetArtists();
  var okObjectResult = settings.Should().BeOfType<OkObjectResult>().Subject;
  var result = okObjectResult.Value.Should().BeAssignableTo<SomeType>();
}

我使用了一些来自FluentAssetions lib的扩展方法，它非常有用。

单元测试任务<iactionresult>

2 个答案: