human
I wrote the below code

    class IDeployerTests(AsyncTestCase, ):
        '\n                                Tests    for    ``IDeployer``.\n                                '
        def _make_deployer(self):
            '\n                                                Make    the    ``IDeployer``    under    test.\n                                                '
            return fixture(self)
        def test_interface(self):
            '\n                                                The    object    claims    to    provide    the    interface.\n                                                '
            self.assertTrue(verifyObject(IDeployer, self._make_deployer()))
        def _discover_state(self):
            "\n                                                Create    a    deployer    using    the    fixture    and    ask    it    to    discover    state.\n\n                                                :return:    The    return    value    of    the    object's    ``discover_state``\n                                                                method.\n                                                "
            self._deployer = self._make_deployer()
            result = self._deployer.discover_state(DeploymentState(nodes={NodeState(hostname='10.0.0.1')}), persistent_state=PersistentState())
            return result
        def test_discover_state_ilocalstate_result(self):
            "\n                                                The    object's    ``discover_state``    method    returns    a    ``Deferred``    that\n                                                fires    with    a    ``ILocalState``    provider.\n                                                "
            def discovered(local_state):
                self.assertTrue(ILocalState.providedBy(local_state))
                self.assertEqual(tuple, type(local_state.shared_state_changes()))
            return self._discover_state().addCallback(discovered)
        def test_discover_state_iclusterstatechange(self):
            '\n           ...

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def ideployer_tests_factory(fixture):