IHttpActionResult与集成测试Web API v2在MS测试中的应用

Question

VS2013根据我的EF上下文自动为我生成了一个web api v2控制器。我正在尝试对控制器的put部分进行单元测试。无论我做什么，我都不能让我的断言检查StatusCodeResult返回。自动生成的代码如下所示：

 // PUT api/Vendor/5
    public IHttpActionResult PutVendor(int id, Vendor vendor)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        if (id != vendor.Id)
        {
            return BadRequest();
        }

        db.Entry(vendor).State = EntityState.Modified;

        try
        {
            db.SaveChanges();
        }
        catch (DbUpdateConcurrencyException)
        {
            if (!VendorExists(id))
            {
                return NotFound();
            }
            else
            {
                throw;
            }
        }

        return StatusCode(HttpStatusCode.NoContent);
    }

我的集成测试如下所示：

        [TestMethod]
    public void PutVendor_UpdateVendorRecord_ReturnsTrue()
    {
        // Arrange
        //CleanUpVendors();

        var controller = new VendorController(ctx);
        const string vendorName = "Unit Test Company";

        // Add vendor to database
        ctx.Vendors.Add(new Vendor { Active = true, Name = vendorName });
        ctx.SaveChanges();

        var myVendor = (from v in ctx.Vendors
                        where v.Name == vendorName
                        select v).FirstOrDefault();

        // Get Newly Inserted ID
        Assert.IsNotNull(myVendor, "Vendor is Null");
        myVendor.Name = "New Name";

        // Act
        var httpActionResult = controller.PutVendor(myVendor.Id, myVendor);
        //var response = httpActionResult as OkNegotiatedContentResult<Vendor>;
        var response = httpActionResult as OkNegotiatedContentResult<Vendor>;

        // Assert


    }

我的测试有什么问题吗？我的断言应该是什么样子的？

此断言返回true：

Assert.IsInstanceOfType(httpActionResult, typeof(System.Web.Http.Results.StatusCodeResult));

但我不认为它实际上是在测试任何东西，除了有某种形式的回报。任何帮助都将不胜感激。

Answer 1

考虑到您对计划中的内存数据库更改的评论，以下是如何在您的场景中进行编写测试的一些示例：

    PeopleController people = new PeopleController();

    // mismatched person Id returns BadRequest
    Person person = new Person();
    person.Id = 11;
    person.Name = "John updated";

    IHttpActionResult result = people.PutPerson(10, person).Result;

    Assert.IsInstanceOfType(result, typeof(BadRequestResult));

    // ---------------------------------------------------

    // non-existing person
    Person person = new Person();
    person.Id = 1000;
    person.Name = "John updated";

    IHttpActionResult result = people.PutPerson(1000, person).Result;

    Assert.IsInstanceOfType(result, typeof(NotFoundResult));

    // --------------------------------------------------------

    //successful update of person information and its verification
    Person person = new Person();
    person.Id = 10;
    person.Name = "John updated";

    IHttpActionResult result = people.PutPerson(10, person).Result;

    StatusCodeResult statusCodeResult = result as StatusCodeResult;

    Assert.IsNotNull(statusCodeResult);
    Assert.AreEqual<HttpStatusCode>(HttpStatusCode.NoContent, statusCodeResult.StatusCode);

    //retrieve the person to see if the update happened successfully
    IHttpActionResult getPersonResult = people.GetPerson(10).Result;

    OkNegotiatedContentResult<Person> negotiatedResult = getPersonResult as OkNegotiatedContentResult<Person>;
    Assert.IsNotNull(negotiatedResult);
    Assert.AreEqual<string>(person.Name, negotiatedResult.Content.Name);