def METHOD_NAME(self):
    result = self.run_command([self.command_name, "--base", "core20"])
    self.assertThat(result.exit_code, Equals(0))
    self.assertThat(
        result.output, Contains("Displaying plugins available for 'core20")
    )
    self.fake_iter_modules.mock.assert_called_once_with(
        snapcraft_legacy.plugins.v2.__path__
    )