Is it possible for a unit test to assert that a method calls sys.exit()?

Question

I have a Python 2.7 method that sometimes calls

sys.exit(1)

Is it possible to make a unit test that verifies this line of code is called when

Answer 1

As an additional note to Pavel's excellent answer, you can also check for specific statuses if they're provided in the function you're testing. For example, if your_method() contained the following sys.exit("Error"), it would be possible to test for "Error" specifically:

with self.assertRaises(SystemExit) as cm:
    your_method()
    self.assertEqual(cm.exception, "Error")