如何单元测试返回一个匿名对象数组的JsonResult？

Question

我有一个返回的匿名对象的JSON数组的操作：

public JsonResult GetItems() 
{ 
    var items = new[] { new { Id = 1, Name = "One" }, new { Id = 2, Name = "Two" } }; 
    return Json(items); 
} 

如何编写该方法的测试？事情是这样的：

[TestMethod] 
public void MyController_GetItems() 
{ 
    var controller = new MyController(); 
    var result = controller.GetItems(); 
    dynamic items = result.Data; 
    Assert.AreEqual("One", items[0].Name); // ??? 
} 

Answer 1

好，返回类型仍然是一个JsonResult。如果你在文档中徘徊，应该有一种方法来检查它的值。

http://msdn.microsoft.com/en-us/library/system.web.mvc.jsonresult(v=vs.118).aspx

它看起来像你得到的是一个Object类型。所以，我认为你正在做的是你能做的最好的事情。

Answer 2

var items = (dynamic[])result.Data; 
Assert.AreEqual("One", items[0].Name); 

Answer 3

怎么是这样的： JsonNetResult是，取代了微软内部的JSON序列与JSON.net

using FakeItEasy; 
using Newtonsoft.Json; 
using NUnit.Framework; 
using System; 
using System.Text; 
using System.Web; 
using System.Web.Mvc; 
using System.Web.Routing; 

public class JsonNetResultFixture 
{ 
    private JsonNetResult _sut; 

    private Controller fakeController; 
    private HttpContextBase fakeContext; 
    private HttpRequestBase fakeRequest; 
    private HttpResponseBase fakeResponse; 
    private RequestContext fakeRequestContext; 

    [SetUp] 
    public void Setup() 
    { 
     fakeController = A.Fake<Controller>(); 
     fakeContext = A.Fake<HttpContextBase>(); 
     fakeRequest = A.Fake<HttpRequestBase>(); 
     fakeResponse = A.Fake<HttpResponseBase>(); 
     fakeRequestContext = new RequestContext(fakeContext, new RouteData()); 
     fakeController.ControllerContext = new ControllerContext(fakeRequestContext, fakeController); 

     A.CallTo(() => fakeRequest.HttpMethod).Returns(HttpVerbs.Post.ToString()); 
     A.CallTo(() => fakeContext.Response).Returns(fakeResponse); 
     A.CallTo(() => fakeContext.Request).Returns(fakeRequest); 

     _sut = new JsonNetResult(); 
    } 

    [Test] 
    [ExpectedException(typeof(ArgumentNullException))] 
    public void should_throw_argumentexception_if_context_is_null() 
    { 
     _sut.ExecuteResult(null); 
    } 

    [Test] 
    public void should_write_serialized_class_to_output_stream() 
    { 
     //Arrange 
     var sb = new StringBuilder(); 

     _sut.Data = new SerializableClass { Id = Guid.NewGuid(), Payload = "awesome payload" }; 

     var serializedData = JsonConvert.SerializeObject(_sut.Data, Formatting.Indented); 

     A.CallTo(() => fakeResponse.Write(A<String>.Ignored)).Invokes((String x) => sb.Append(x)); 

     //Act 
     _sut.ExecuteResult(fakeController.ControllerContext); 

     //Assert 
     Assert.That(sb.ToString(), Is.EqualTo(serializedData)); 
    } 

    [Test] 
    public void should_write_nothing_when_data_is_nothing() 
    { 
     //Arrange 
     var sb = new StringBuilder(); 

     A.CallTo(() => fakeResponse.Write(A<String>.Ignored)).Invokes((String x) => sb.Append(x)).MustHaveHappened(Repeated.Never); 

     //Act 
     _sut.ExecuteResult(fakeController.ControllerContext); 

     //Assert 
     Assert.That(sb.ToString(), Is.EqualTo(String.Empty)); 
    } 

    [Test] 
    public void should_set_content_type_if_sent_in() 
    { 
     //Arrange 
     var contentType = "text/xml"; 
     _sut.ContentType = contentType; 

     //Act 
     _sut.ExecuteResult(fakeController.ControllerContext); 

     //Assert 
     Assert.That(_sut.ContentType, Is.EqualTo(contentType)); 
    } 

    [Test] 
    public void should_set_content_encoding_if_sent_in() 
    { 
     //Arrange 
     var contentEncoding = Encoding.BigEndianUnicode; 
     _sut.ContentEncoding = contentEncoding; 

     //Act 
     _sut.ExecuteResult(fakeController.ControllerContext); 

     //Assert 
     Assert.That(_sut.ContentEncoding, Is.EqualTo(contentEncoding)); 
    } 
} 

public class SerializableClass 
{ 
    public Guid Id { get; set; } 
    public String Payload { get; set; } 
}