'Create a course with one section, two subsections, and four units'

def populate_course_fixture(self, course_fixture):

    self.chap_1_handle = 0
    self.chap_1_seq_1_handle = 1
    self.seq_1_vert_1_handle = 2
    self.seq_1_vert_2_handle = 3
    self.chap_1_seq_2_handle = 4
    course_fixture.add_children(XBlockFixtureDesc('chapter', '1').add_children(XBlockFixtureDesc('sequential', '1.1').add_children(XBlockFixtureDesc('vertical', '1.1.1'), XBlockFixtureDesc('vertical', '1.1.2')), XBlockFixtureDesc('sequential', '1.2').add_children(XBlockFixtureDesc('vertical', '1.2.1'), XBlockFixtureDesc('vertical', '1.2.2'))))
