Method test_correct_element_index

test/python/test_ElementMap.py:69–71

(self, em1)

class Test_symbol:
    def test_correct_element_index(self, em1):
        for i, e in enumerate(elements):
            assert em1.symbol(i) == e, "Wrong element order."
    def test_wrong_argument_type(self, em1):
        with pytest.raises(TypeError):
            em1.symbol("H")