def test4(self):
        self.trytext("add_plugin('test_larch_plugin')")
        self.trytext("b = _tests.f1_larch(5)")
        self.isValue('b', 10)
        self.NoExceptionRaised()

        self.trytext("c = _tests.f1_larch(5, _larch=None)")
        self.isValue('c', 5)
        self.NoExceptionRaised()
test function with _larch keyword...
dataset/ETHPy150Open xraypy/xraylarch/tests/test_plugins_call.py/TestPlugins.test4