def _get_tops(self):
        tops = DefaultOrderedDict(list)

        tops['a'].append(self.env1)
        tops['b'].append(self.env2)
        tops['c'].append(self.env3)
        return tops
Test that plugin callbacks are being called upon user choice.
dataset/ETHPy150Open saltstack/salt/tests/unit/highstateconf_test.py/TopFileMergeTestCase._get_tops--crossover with--dataset/ETHPy150Open beetbox/beets/test/test_plugins.py/PromptChoicesTest.test_plugin_callback