单元测试任务<IActionResult>

Question

我正在开发 .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 });
}

我想编写一个测试来断言我确实得到了 200 OK 结果。

我试过以下方法：

[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)
}

但是我在投射到 OkObjectResult 的行中遇到错误。它说我无法将类型 Task<IActionResult> 转换为 OkObjectResult

Answer 1

您需要接收函数 GetArtists()（不是任务）的结果，如下所示：

var getArtistsResult = artistsController.GetArtists().Result;

然后你可以将它转换为 OkObjectResult。

或者您可以尝试像这样更改您的测试：

[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 库的扩展方法，它非常有用。

Answer 2

调用异步方法时需要使用await:

var getArtistsResult = await artistsController.GetArtists();

这反过来使你的测试方法async Task:

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

单元测试任务<IActionResult>

Unit Test Task<IActionResult>

c#

unit-testing

mstest

asp.net-core