def METHOD_NAME(self):
    super().METHOD_NAME()
    # Append some random string to avoid having children with the same name
    self.child_name = "te-child-" + secrets.token_hex(4)
    self.other_child_name = "other-te-child-" + secrets.token_hex(4)
    child_device_fragment = (
        self.cumulocity.get_child_device_of_thin_edge_device_by_name(
            self.project.device, self.child_name
        )
    )
    self.assertThat(
        "actual == expected", actual=child_device_fragment, expected=None
    )
    self.addCleanupFunction(self.test_cleanup)