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<JsonResult>(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);

Answer 2

RPM, you look to be correct. I still have much to learn about dynamic and I cannot get Marc's approach to work either. So here is how I was doing it before. You may find it helpful. I just wrote a simple extension method:

    public static object GetReflectedProperty(this object obj, string propertyName)
    {  
        obj.ThrowIfNull("obj");
        propertyName.ThrowIfNull("propertyName");

        PropertyInfo property = obj.GetType().GetProperty(propertyName);

        if (property == null)
        {
            return null;
        }

        return property.GetValue(obj, null);
    }

Then I just use that to do assertions on my Json data:

        JsonResult result = controller.MyAction(...);
                    ...
        Assert.That(result.Data, Is.Not.Null, "There should be some data for the JsonResult");
        Assert.That(result.Data.GetReflectedProperty("page"), Is.EqualTo(page));