How to unit test whether a Core MVC controller action calls ControllerBase.Problem()

Question

We have a controller that derives from ControllerBase with an action like this:

public async Task Get(int id)
{
  try
  {
           


        

Answer 1

In your tests, if you first create a ControllerContext, then ProblemDetails should be created as expected while executing controller code.

...
MyController controller;

[Setup]
public void Setup()
{
    controller = new MyController();
    controller.ControllerContext = new ControllerContext
    {
        HttpContext = new DefaultHttpContext
        {
            // add other mocks or fakes 
        }
    };
}
...