单元测试 AspNetCore 控制器检查 HttpStatusCode 与 ActionResult<T> 结果

Question

我正在尝试从对控制器的调用中检查 HttpStatusCode，但我不知道如何将我的 ActionResult<T> 转换为 HttpStatusCodeResult。

来自控制器的方法：

[Get]
public async Task<ActionResult<PagedResult<PersoDemandLiteResponse>>> GetDemandsByFilterAsync([FromQuery] DemandFilterRequest filter)
    => await this.GetAsync(() => DemandService.GetDemandByFilterAsync(filter), (sources) => sources);

这是我的测试方法（简化）：

... mocking of the services ...

var controller = new DemandController(demandService, organizationService.Object, productService.Object, Mapper.Object);

var request = new DemandFilterRequest { OrganizationId = Guid.NewGuid() };

var result = await controller.GetDemandsByFilterAsync(request);

//I would like to do something like this 
 var action = result as HttpStatusCodeResult;
 var badRequest = (int)HttpStatusCode.BadRequest;

 Assert.Equal(badRequest, action.StatusCode);

但我收到以下错误：

错误 CS0039 无法通过引用转换、装箱转换、拆箱转换、包装转换或空类型转换将类型“Microsoft.AspNetCore.Mvc.ActionResult>”转换为“System.Web.Mvc.HttpStatusCodeResult”。

关于如何实现这一点的任何想法？

Answer 1

假设被测方法返回了示例代码所暗示的错误请求，这将类似于

//...

if(...)
    return BadRequest();

//...    

那么在单元测试的时候，需要从action result中提取包装出来的结果

//Arrange
//...omitted for brevity

//Act
ActionResult<PagedResult<PersoDemandLiteResponse>> response = 
    await controller.GetDemandsByFilterAsync(request);
    
//Assert
BadRequestResult actual = response.Result as BadRequestResult;    
Assert.NotNull(actual);
int badRequest = (int)HttpStatusCode.BadRequest;
Assert.Equal(badRequest, actual.StatusCode);

参考Controller action return types in ASP.NET Core Web API