def _test_restorer(stack, data):
    # We need to test the request's specific Registry. Initialize it here so we
    # can use it later (RegistryManager will re-use one preexisting in the
    # environ)
    registry = Registry()
    extra_environ={'paste.throw_errors': False,
                   'paste.registry': registry}
    request_id = restorer.get_request_id(extra_environ)
    app = TestApp(stack)
    res = app.get('/', extra_environ=extra_environ, expect_errors=True)

    # Ensure all the StackedObjectProxies are empty after the RegistryUsingApp
    # raises an Exception
    for stacked, proxied_obj, test_cleanup in data:
        only_key = list(proxied_obj.keys())[0]
        try:
            assert only_key not in stacked
            assert False
        except __HOLE__:
            # Definitely empty
            pass

    # Ensure the StackedObjectProxies & Registry 'work' in the simulated
    # EvalException context
    replace = {'replace': 'dict'}
    new = {'new': 'object'}
    restorer.restoration_begin(request_id)
    try:
        for stacked, proxied_obj, test_cleanup in data:
            # Ensure our original data magically re-appears in this context
            only_key, only_val = list(proxied_obj.items())[0]
            assert only_key in stacked and stacked[only_key] == only_val

            # Ensure the Registry still works
            registry.prepare()
            registry.register(stacked, new)
            assert 'new' in stacked and stacked['new'] == 'object'
            registry.cleanup()

            # Back to the original (pre-prepare())
            assert only_key in stacked and stacked[only_key] == only_val

            registry.replace(stacked, replace)
            assert 'replace' in stacked and stacked['replace'] == 'dict'

            if test_cleanup:
                registry.cleanup()
                try:
                    stacked._current_obj()
                    assert False
                except TypeError:
                    # Definitely empty
                    pass
    finally:
        restorer.restoration_end()
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Paste-2.0.1/tests/test_registry.py/_test_restorer