public void Display_NonExistingPet_ReturnsHttp404()
{
// Arrange
string petName = "Barney";
SetControllerContext(petName);
// Act
var result = _controller.DisplayHttpNotFound() as HttpStatusCodeResult;
// Assert
// The action method returned an action result
Assert.IsNotNull(result);
// The action result is an HttpStatusCodeResult object
Assert.IsInstanceOfType(result, typeof(HttpStatusCodeResult));
// The HTTP code is 404 (not found)
Assert.AreEqual(404, result.StatusCode);
}
