如何使用 xUNit 测试 WebAPI 中的 NotFound

Question

我有一个 Web API 方法，它将两个输入作为

string

并返回输出。我已执行以下步骤来使用 xUnit 进行单元测试。

1. 创建了 xUnit 项目并向其添加了一种方法。
2. 使用

   AutoFixure

   创建模拟数据。
3. 添加了测试代码并运行测试无需运行API项目。我就在这里做这个吗？我还需要运行 API 项目吗？
4. 我的测试给出的是结果而不是 NoDataFound。当我从 Postman 运行测试用例时，我得到了预期的结果

   404 error

   但在 xUnit 中，得到了计数为 3 的对象。

我不知道我在哪里缺少什么。请提供任何帮助。 TIA。 下面是我的代码。

public class ControllerTest
{
    private readonly IFixture fixure;
    private readonly Mock<ICustomerService> service;;
    private readonly CustController  controller;

    public CustControllerTest()
    {
        service = new Mock<ICustomerService>();
        controller = new CustController(service.Object);
        fixure = new Fixture();
    }

    [Fact]
    public async Task GetMember_WithZeroAsInput_ShouldReturnNotFound()

    {

        //arrange
            var member = fixure.Create<List<Member>>();//creating a mock for Member object
            var Id = Convert.ToString(0); //0 as input
            var name = Convert.ToString(0);//0 as input

            service.Setup(x => x.GetMember(Id, name)).ReturnsAsync(member);//here I am getting 3 record count even my both inputs are 0

            //act
            var result = await CustController.GetMember(Id, name);//here also I am getting 3 record count even my both inputs are 0.
                //when I am calling GetMember from Postman with 0 as inputs I am getting NotFound result. 

            //assert
            result.Should().NotBeNull();
            result.Result.Should().BeAssignableTo<NotFoundObjectResult>();//getting error here as - Expected memberFlagResult.Result to be assignable to Microsoft.AspNetCore.Mvc.NotFoundObjectResult, but Microsoft.AspNetCore.Mvc.OkObjectResult is not.
            result.Verify(x => x.GetMember(memberId, flagName), Times.Once());
        
    }
}```

Answer 1

您的问题来自线路

var member = fixture.Create<List<Member>>();

fixture.Create

将生成一个匿名对象（https://github.com/AutoFixture/AutoFixture#overview）来解决您的问题，您应该更明确=>

var member = null

或

var member = new List<Member>()

，具体取决于您是否期望

null

或控制器中的空列表以返回

404

。

Answer 2

这应该有效

result.Should().BeAssignableTo<NotFoundResult>();