'Create a course with a single chapter.
That chapter has a single section.
That section has a single vertical.
That vertical has a single video element.'

def populate_course_fixture(self, course_fixture):

    video_block = XBlockFixtureDesc(u'video', u'Test    Video')
    vertical = XBlockFixtureDesc(u'vertical', u'Test    Vertical')
    vertical.add_children(video_block)
    sequential = XBlockFixtureDesc(u'sequential', u'Test    Section')
    sequential.add_children(vertical)
    chapter = XBlockFixtureDesc(u'chapter', u'Test    Chapter')
    chapter.add_children(sequential)
    self.course_fixture.add_children(chapter)
