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If I have a controller like this: [HttpPost] public JsonResult FindStuff(string query) { var results = _repo.GetStuff(query); var jsonResult = results.Select(x => new { id = x.Id, name = x.Foo, type = x.Bar }).ToList(); return Json(jsonResult); } Basically, I grab stuff from my repository, then project it into a List<T> of anonymous types. How can I unit-test it? System.Web.Mvc.JsonResult has a property called Data , but it's of type object , as we expected. So does that mean if I want to test that the JSON object has the properties I expect ("id", "name", "type"), I have to use reflection? EDIT: Here's my test: // Arrange. const string autoCompleteQuery = "soho"; // Act. var actionResult = _controller.FindLocations(autoCompleteQuery); // Assert. Assert.IsNotNull(actionResult, "No ActionResult returned from action method."); dynamic jsonCollection = actionResult.Data; foreach (dynamic json in jsonCollection) { Assert.IsNotNull(json.id, "JSON record does not contain \"id\" required property."); Assert.IsNotNull(json.name, "JSON record does not contain \"name\" required property."); Assert.IsNotNull(json.type, "JSON record does not contain \"type\" required property."); } But I get a runtime error in the loop, stating "object does not contain a definition for id". When I breakpoint, actionResult.Data is defined as a List<T> of anonymous types, so I figure if I enumerate through these, I can check the properties. Inside the loop, the object does have a property called "id" - so not sure what the issue is.

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