Unit test - Moq abstract class with SetOwinContext

I am trying to Moq to test abstract class method.

var mock = new Mock<BaseStudentController>();
mock.CallBase = true;
var ta = mock.Object;
var result = await ta.ActivateStudent"User1@test.com", true);

This successfully mocks the base class, and it hits the method in my abstract class.

Problem:

However, my abstract class is also expecting Request.GetOwinContext. I am not sure how i can moq it along with my above request.