How to assert with anonymous type result in unit testing web API?

Question

Hi I am writing unit test cases for the following method in my controller.

    [HttpGet]
    [Route("GetList")]
    public IHttpActionResult GetAllMasterList()
    {
        var MasterList = _masterListRepo.GetAll().Select(t => new { t.MASTER_ID, t.MASTER_NAME }).OrderBy(t=>t.MASTER_NAME).ToList();
        return Ok(MasterList);
    }

For the above method the unit test case method is as follows.

    [TestMethod]
    public void AllMastersList()
    {
        //Arrange
        var controller = new MastersController();
        var actualResults = _masterListRepo.GetAll().ToList();

        //Act
        var actionResult = controller.GetAllMasterList();

        //Assert
        Assert.IsTrue(actionResult.GetType().GetGenericTypeDefinition() == typeof(OkNegotiatedContentResult<>));
        var contentExpected = actionResult as OkNegotiatedContentResult<IEnumerable<dynamic>>;
        Assert.IsNotNull(contentExpected.Content.ToList());
        Assert.AreEqual(contentExpected.Content.Count(), actualResults.Count);

    }

I am getting contentExpected as null. How do I cast this Ok() result to get the value. How to do it?

Take a look at the answer I gave here stackoverflow.com/a/38446754/5233410 — Nkosi
– Nkosi, Commented Jan 9, 2018 at 9:50

exeraph · Accepted Answer · 2018-01-09 08:32:11Z

2

I would strongly recommed against returning anonymous objects. Introduce a model class with will allow you to easily unit test you api calls.

public class Master {
    public string Id { get; set;}
    public string Name { get; set;}
}

var MasterList = _masterListRepo.GetAll().Select(t => new Master {Id = MASTER_ID, Name = t.MASTER_NAME).OrderBy(t=>t.MASTER_NAME).ToList();

Also you don't have to return an IHttpActionResult from your Method, you can just return an IEnumerable with also makes your test way more readable

var controller = new MastersController();
var actualResults = _masterListRepo.GetAll().ToList();

var resultsFromController = controller.GetAllMasterList(); //This is now an IEnumerable<Master>)

answered Jan 9, 2018 at 8:32

exeraph

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1 Comment

Jyotirmaya Prusty Over a year ago

totally got your point. But there must be some way to test such methods. Which returns anonymous lists.

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