'Verify that a draft xblock\'s container preview returns the expected HTML.'

def test_draft_container_preview_html(self):

    self.validate_preview_html(self.vertical, self.container_view)
    self.validate_preview_html(self.child_container, self.container_view)
    self.validate_preview_html(self.child_vertical, self.reorderable_child_view)
