def test2(self):
        self.trytext("add_plugin('test_larch_plugin')")
        self.trytext("a = _tests.add2(3, 5)")
        self.isValue('a', 11)
        self.NoExceptionRaised()

        self.trytext("a = _tests.add2(y=0, x=8)")
        self.isValue('a', 16)
        self.NoExceptionRaised()

        self.trytext("a = _tests.add2('hello', 'world')")
        self.isValue('a', 'hellohelloworld')
        self.NoExceptionRaised()
test function with 2 arguments 2*x+y
dataset/ETHPy150Open xraypy/xraylarch/tests/test_plugins_call.py/TestPlugins.test2