如何对返回ContentResult的ActionResult进行单元测试？

Question

我想单元测试以下ASP.NET MVC控制器索引操作.我该如何替换下面断言中的实际参数(以？为标记).

using System.Web.Mvc;
namespace MvcApplication1.Controllers
{
    public class StatusController : Controller
    {
        public ActionResult Index()
        {
            return Content("Hello World!");
        }
    }
}


[TestMethod]
public void TestMethod1()
{
    // Arrange
    var controller = CreateStatusController();

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

    // Assert
    Assert.AreEqual( "Hello World!.", ? );
}

Answer 1

使用"as"运算符进行可为空的强制转换.然后只需检查null结果

[TestMethod]
public void TestMethod1()
{
    // Arrange
    var controller = CreateStatusController();

    // Act
    var result = controller.Index() as ContentResult;

    // Assert
    Assert.NotNull(result);
    Assert.AreEqual( "Hello World!.", result.Content);
}

Answer 2

我喜欢为这类事情创建断言助手.例如,您可能会执行以下操作:

public static class AssertActionResult {
    public static void IsContentResult(ActionResult result, string contentToMatch) {
        var contentResult = result as ContentResult;
        Assert.NotNull(contentResult);
        Assert.AreEqual(contentToMatch, contentResult.Content);        
    }
}

然后你会这样称呼:

[TestMethod]
public void TestMethod1()
{
    var controller = CreateStatusController();
    var result = controller.Index();

    AssertActionResult.IsContentResult(result, "Hello World!");    
}

我认为这使得测试更容易阅读和编写.