def METHOD_NAME(self):
    """
    Test that the method returns a URL for the "last completed" block
    when sending a user object
    """
    block_url = retrieve_last_sitewide_block_completed(
        self.engaged_user
    )
    empty_block_url = retrieve_last_sitewide_block_completed(
        self.cruft_user
    )
    assert block_url ==\
           'test_url:9999/courses/course-v1:{org}+{course}+{run}/jump_to/'\
           'block-v1:{org}+{course}+{run}+type@vertical+block@{vertical_id}'.format(
               org=self.course.location.course_key.org,
               course=self.course.location.course_key.course,
               run=self.course.location.course_key.run,
               vertical_id=self.vertical2.location.block_id
           )
    assert empty_block_url is None