值不能为空.参数名称:请求

Question

我正在使用nunit创建一个单元测试,所有这些代码在运行时都能正常工作.

我有HttpResponseMessage下面这个受保护的代码,当它返回时我的控制器会调用它.

但是,错误:

"值不能为空.参数名称:请求"正在显示.

当我检查请求时,实际上是null.

问题:如何编码我的单元测试以返回HttpResponseMessage？

错误显示在此行中:

  protected HttpResponseMessage Created<T>(T result) => Request.CreateResponse(HttpStatusCode.Created, Envelope.Ok(result));

这是我的控制器:

    [Route("employees")]
    [HttpPost]
    public HttpResponseMessage CreateEmployee([FromBody] CreateEmployeeModel model)
    {
        //**Some code here**//

        return Created(new EmployeeModel
        {
            EmployeeId = employee.Id,
            CustomerId = employee.CustomerId,
            UserId = employee.UserId,
            FirstName = employee.User.FirstName,
            LastName = employee.User.LastName,
            Email = employee.User.Email,

            MobileNumber = employee.MobileNumber,
            IsPrimaryContact = employee.IsPrimaryContact,
            OnlineRoleId = RoleManager.GetOnlineRole(employee.CustomerId, employee.UserId).Id,
            HasMultipleCompanies = EmployeeManager.HasMultipleCompanies(employee.UserId)
        });
    }

Answer 1

你得到的原因:

System.Web.Http.dll中发生类型为"System.ArgumentNullException"的异常但未在用户代码中处理附加信息:值不能为null.

是因为Request对象是null.

解决方案是在测试中创建控制器的实例,例如:

    var myApiController = new MyApiController
    {
        Request = new System.Net.Http.HttpRequestMessage(),
        Configuration = new HttpConfiguration()
    };

这样,在创建类的新实例时,MyApiController我们正在初始化Request对象.而且,还必须提供相关的配置对象.

最后,您的Api控制器的单元测试示例可能是:

[TestClass]
public class MyApiControllerTests
{
    [TestMethod]
    public void CreateEmployee_Returns_HttpStatusCode_Created()
    {
        // Arrange
        var controller = new MyApiController
        {
            Request = new System.Net.Http.HttpRequestMessage(),
            Configuration = new HttpConfiguration()
        };

        var employee = new CreateEmployeeModel
        {
            Id = 1
        };

        // Act
        var response = controller.CreateEmployee(employee);

        // Assert
        Assert.AreEqual(response.StatusCode, HttpStatusCode.Created);
    }
}

Answer 2

HttpRequestMessage我认为发生的情况是，当您更新控制器时，您没有实例化或分配您的请求属性（ ）。我认为在通过单元测试调用 Api 方法之前必须指定请求。

您可能还需要配置 ( HttpConfiguration)：

sut = new YourController()
    {
        Request = new HttpRequestMessage {
            RequestUri = new Uri("http://www.unittests.com") },

        Configuration = new HttpConfiguration()
    };

让我知道这是否有效。