def METHOD_NAME(self):
    pattern_view = self.widget.pattern_widget
    self.load_phase('au_Anderson.jcpds')
    num_line_items = len(pattern_view.phases[0].line_items)
    self.model.phase_model.delete_reflection(0, 0)
    self.assertEqual(len(pattern_view.phases[0].line_items),
                     num_line_items-1)