ASP.NET测试Api控制器:Uri(Request.GetEncodedUrl()..)返回null

Question

我正在测试一个ASP.NET Core Api-post方法，但我得到了导致测试失败的System.NullReferenceException。

当我试图返回Created((-ActionResult时，会出现null异常，如下所示：

return Created(new Uri(Request.GetEncodedUrl() + "/" + personDto.Id), personDto);

我的personDto.Id和personDto都不为null，但Uri((的结果返回null。我在谷歌上搜索了一下，但没有找到解决方案，但我相信我必须以某种方式嘲笑Uri((-方法(我对测试和asp.net都是新手(。Api在针对SQL Server进行"实时"测试时运行良好。

我正在使用Moq和NUnit进行测试，下面是我的设置和测试方法的一部分：

public void SetUp()
{
_mapper = GenerateConcreteInstance();
_personService = new Mock<IPersonService>();
_personService.Setup(ps => ps.Create(It.IsAny<Person>())).Verifiable();
_controller = new PeopleController(_personService.Object, _mapper);
}
[Test]
public void CreatePerson_WhenCalled_IsNotNull()
{
var personDto = new PersonDto()
{
Id = 3,
Firstname = "Karl",
Lastname = "Karlsson",
City = "Oslo",
Email = "[e-mail]"
};
var result = _controller.CreatePerson(personDto);
var createdResult = result as CreatedResult;
Assert.IsNotNull(createdResult);
}

我正在尝试测试的控制器：

[HttpPost]
public IActionResult CreatePerson(PersonDto personDto)
{
if (!ModelState.IsValid)
return BadRequest();
var person = _mapper.Map<PersonDto, Person>(personDto);
person.DateCreated = DateTime.Now;
_personService.Create(person);
_personService.Save();
personDto.Id = person.Id;
return Created(new Uri(Request.GetEncodedUrl() + "/" + personDto.Id), personDto);
}

如何正确设置此测试以避免出现null异常？如果我的测试在任何其他方面都不好，我将感谢关于如何解决这个问题的任何帮助，以及一般的建议。

更新

我把测验改成这样了。我走对了吗？

public void CreatePerson_WhenCalled_IsNotNull()
{
var personDto = new PersonDto()
{
Id = 3,
Firstname = "Karl",
Lastname = "Karlsson",
City = "Oslo",
Email = "[e-mail]"
};
var request = new Mock<HttpRequest>();
request.Setup(x => x.Headers).Returns(
new HeaderDictionary {
{"X-Requested-With", "XMLHttpRequest"}
});

var context = new Mock<HttpContext>();
context.Setup(x => x.Request).Returns(request.Object);
_controller.ControllerContext = new ControllerContext()
{
HttpContext = context.Object
};
var result = _controller.CreatePerson(personDto);
var createdResult = result as CreatedResult;
Assert.IsNotNull(createdResult);
}

Answer 1

Request.GetEncodedUrl()扩展依赖于具有有效的请求。

/// <summary>
/// Returns the combined components of the request URL in a fully escaped form suitable for use in HTTP headers
/// and other HTTP operations.
/// </summary>
/// <param name="request">The request to assemble the uri pieces from.</param>
/// <returns>The encoded string version of the URL from <paramref name="request"/>.</returns>
public static string GetEncodedUrl(this HttpRequest request)
{
return BuildAbsolute(request.Scheme, request.Host, request.PathBase, request.Path, request.QueryString);
}

源

哪个将使失败

if (scheme == null)
{
throw new ArgumentNullException(nameof(scheme));
}

源

没有与所示示例相关的上下文或请求，因此我建议提供一个有效的上下文，其中填充了必要的成员，以便按预期进行测试。

//...omitted for brevity
var httpContext = new DefaultHttpContext();
//http://localhost/example
httpContext.Request.Scheme = "http";
httpContext.Request.Host = new HostString("localhost");
//Controller needs a controller context 
var controllerContext = new ControllerContext() {
HttpContext = httpContext,
};
//assign context to controller
_controller.ControllerContext = controllerContext;
//...omitted for brevity