public void CelebrateBirthday()
{
// our mock context will return 1
var id = _user.GetCurrentPersonId();
// get the person from the mock db
var person = _personRepo.GetPersonById(id);
// set our expectation
int expectedAge = person.Age + 1;
// this is the function we are actually here to test
var result = _birthdayService.CelebrateBirthday(person);
Assert.IsNotNull(result);
Assert.IsInstanceOf(typeof(Person), result);
Assert.AreEqual(expectedAge, result.Age);
}
