def test_key_builder(self):
qk = QueryKey(Foo)
self.runtests([
(qk.build_key({}, {}, ''), '~Foo_all', 'all'),
(qk.build_key({'username': '******'}, {}, ''), '~Foo_all+Foo_index:username:foo', 'all+inter'),
(qk.build_key({}, {'username': '******'}, ''), '~Foo_all-Foo_index:username:foo', 'all+diff'),
(qk.build_key({}, {}, 'Foo:username'), '~Foo_all^Foo:username', 'all+sort'),
])
