c#-xUnit.net IsType在MS测试中等效,返回类型

我正在追踪this guide,并且尝试使用MS Test编写类似的测试. MS Test是否有一个IsType(),当强制转换成功时会返回对象？

从this comparison开始,我可以使用IsInstanceOfType(),但返回类型为void.

我正在尝试在MS Test中实现这一行：
var badRequestResult = Assert.IsType< BadRequestObjectResult>(结果);

[Fact]
public async Task IndexPost_ReturnsBadRequestResult_WhenModelStateIsInvalid()
{
    // Arrange
    var mockRepo = new Mock<IBrainstormSessionRepository>();
    mockRepo.Setup(repo => repo.ListAsync()).Returns(Task.FromResult(GetTestSessions()));
    var controller = new HomeController(mockRepo.Object);
    controller.ModelState.AddModelError("SessionName", "Required");
    var newSession = new HomeController.NewSessionModel();

    // Act
    var result = await controller.Index(newSession);

    // Assert
    var badRequestResult = Assert.IsType<BadRequestObjectResult>(result);
    Assert.IsType<SerializableError>(badRequestResult.Value);
}

是的,我可以先使用as进行转换,然后再使用IsInstanceOfType……只是想知道是否有单线.

var badRequestResult = result as BadRequestObjectResult;
Assert.IsInstanceOfType(badRequestResult, typeof(BadRequestObjectResult));

解决方法:

我从未遇到过MSTest中的等效版本.

如果是强制类型转换,则无需检查实例是否为类型.只要检查它是否不为空.

// Act
var result = await controller.Index(newSession);

// Assert
var badRequestResult = result as BadRequestObjectResult;
Assert.IsNotNull(badRequestResult, "Expected BadRequestObjectResult");
Assert.IsInstanceOfType(badRequestResult.Value,typeof(SerializableError));

否则,您可以创建自己的断言

public static class AssertExtension {
    public static TExpected AssertIsType<TExpected>(this object actual, string message = null) {
        TExpected result = actual as TExpected;
        Assert.IsNotNull(result, message);
        return result;
    }
}

提供所需的行为

// Assert
var badRequestResult = result.AssertIsType<BadRequestObjectResult>();
badRequestResult.Value.AssertIsType<SerializableError>();

标签：xunit-net,mstest,c
来源： https://codeday.me/bug/20191109/2011418.html