How to unit test an Action method which returns JsonResult?

Question

If I have a controller like this:

[HttpPost]
public JsonResult FindStuff(string query) 
{
   var results = _repo.GetStuff(query);
   var jsonResult = results         


        

Answer 1

I extend the solution from Matt Greer and come up with this small extension:

    public static JsonResult IsJson(this ActionResult result)
    {
        Assert.IsInstanceOf(result);
        return (JsonResult) result;
    }

    public static JsonResult WithModel(this JsonResult result, object model)
    {
        var props = model.GetType().GetProperties();
        foreach (var prop in props)
        {
            var mv = model.GetReflectedProperty(prop.Name);
            var expected = result.Data.GetReflectedProperty(prop.Name);
            Assert.AreEqual(expected, mv);
        }
        return result;
    }

And i just run the unittest as this: - Set the expected data result:

        var expected = new
        {
            Success = false,
            Message = "Name is required"
        };

- Assert the result:

        // Assert
        result.IsJson().WithModel(expected);