单元测试返回自定义结果的ASP.NET Web API 2 Controller

Question

我有一个Web API 2控制器,它有一个这样的动作方法:

public async Task<IHttpActionResult> Foo(int id)
{
    var foo = await _repository.GetFooAsync(id);
    return foo == null ? (IHttpActionResult)NotFound() : new CssResult(foo.Css);
}

在哪里CssResult定义为:

public class CssResult : IHttpActionResult
{
    private readonly string _content;

    public CssResult(string content)
    {
        content.ShouldNotBe(null);
        _content = content;
    }

    public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
    {
        var response = new HttpResponseMessage(HttpStatusCode.OK)
        {
            Content = new StringContent(_content, Encoding.UTF8, "text/css")
        };

        return Task.FromResult(response);
    }
}

我如何为此编写单元测试？

我试过这个:

var response = await controller.Foo(id) as CssResult;

但我无法访问实际内容,例如我想验证响应的实际内容是我期望的CSS.

有什么帮助吗？

解决方案是简单地将该_content领域公之于众吗？(感觉很脏)

Answer 1

避免强制转换，尤其是在单元测试中。这应该有效：

var response = await controller.Foo(id);
var message = await response.ExecuteAsync(CancellationToken.None);
var content = await message.Content.ReadAsStringAsync();
Assert.AreEqual("expected CSS", content);