def METHOD_NAME(self):
    new_text = "This is some text!"
    self.assertEqual("", self.position_expander.get_text("Z", "X", "Y"))
    self.position_expander.add_text("Z", "X", "Y", "This is the new text.")
    self.assertEqual(
        "This is the new text.", self.position_expander.get_text("Z", "X", "Y")
    )
    # We should get an exception if we try to add text to the same place
    with self.assertRaises(KeyError):
        self.position_expander.add_text("Z", "X", "Y", "This should not work.")