'Populates the course fixture.
We are modifying \'advanced_modules\' setting of the
course.
Also add a section with a subsection and a unit.'

def populate_course_fixture(self, course_fixture):

    course_fixture.add_advanced_settings({u'advanced_modules': {'value': ['split_test']}})
    course_fixture.add_children(XBlockFixtureDesc('chapter', 'Test    Section').add_children(XBlockFixtureDesc('sequential', 'Test    Subsection').add_children(XBlockFixtureDesc('vertical', 'Test    Unit'))))
