c# - 单元测试中 Web Api Controller 的 ContentResult 总是返回 null

Question

我尝试在 getMethod(string id) 的单元测试中检查的 ContentResult 始终返回 null。 Controller 调用的服务返回 DTO 模型。

我试过了 Action 结果为 OkNegotiatedContentResult Action 结果为 OkNegotiatedContentResult

单元测试:

      [TestMethod]
      public void GetUserInformation_ReturnsUserDetails()
        {
            //Arrange
               UserDetails userDetails = new UserDetails();
               mockUserService.Setup(x => 
         x.GetuserInformation(It.IsAny<string> 
          ())).Returns(userDetails);
             //Act
             IHttpActionResult result = 
              userController.GetUserInformation("226");
              var contentResult = result as 
             OkNegotiatedContentResult<UserDetails>;
            //Assert
           //Validate Ok Result
              Assert.IsNotNull(contentResult);//this fails
              Assert.IsNotNull(contentResult.Content);
              Assert.AreEqual("226", contentResult.Content.userID);
              Assert.IsInstanceOfType(result, 
              typeof(OkNegotiatedContentResult<UserDetails>));//this assert works

            }

Controller :

public IHttpActionResult GetUserInformation(string userID)
        {
            if (!string.IsNullOrEmpty(userID))
            {
                var result = _userService.GetUserInformation(userID);
                if (result != null)
                {
                    return Ok(result);
                }
                return InternalServerError();
            }
            else
            {
                return BadRequest("User Not Found");
            }
        }

服务层:

 public UserDetails GetUserInformation(string userID)
        {
            UserDetails userDetails = new UserDetails();
            //business logic
            return userDetails;
        }

ContentNegotiator = '((System.Web.Http.Results.OkNegotiatedContentResult)result).ContentNegotiator' 抛出类型为'System.InvalidOperationException'的异常

Request = '(result as OkNegotiatedContentResult).Request' 抛出了 'System.InvalidOperationException' 类型的异常

Answer 1

构建 API 应用程序可能有不同的方法。

我的方法是 API 应该构建为 3 层:

• 表示层: Controller
• 业务逻辑:服务
• 数据层:存储库

Controller 和存储库应尽可能精简。所有的逻辑都应该在服务层。在这种情况下，应用程序将是可维护、可扩展和可测试的。

测试示例

使用的包:

• NUnit
• NUnit3TestAdapter
• 起订量

您还可以使用:

• FluentAssertions
• AutoFixture.NUnit3

服务的测试类示例:

[TestFixture]
public class OrdersServiceTests
{
    private OrdersService _sut;

    private Mock<ICapacityService> _capacityService;

    private Mock<IOrdersRepository> _ordersRepository;

    [SetUp]
    public void Setup()
    {
        // Executed for each test. Mocks are recreated. Tests are not influencing each other.

        _ordersRepository = new Mock<IOrdersRepository>();
        _capacityService = new Mock<ICapacityService>();

        _sut = new OrdersService(_ordersRepository.Object, _capacityService.Object);
    }

    [Test]
    public async Task Should_CheckCapacity_WhenCreatingOrder()
    {
        //// Arrange

        var orderEntity = new OrderEntity
        {
            Id = Guid.NewGuid(),
        };

        //// Act

        await _sut.CreateAsync(orderEntity);

        //// Assert

        _capacityService
            .Verify(
                x => x.CheckCapacity(
                    It.Is<Guid>(g => g.Equals(orderEntity.Id)))),
                Times.Once);
    }
}