def test_get_keys():
test_obj = MPCache(1)
test_obj.refresh("some_key", 43, time.time())
test_obj.write("some_other_key", 42)
assert "some_key" in test_obj.get_keys()
assert "some_other_key" in test_obj.get_keys()
assert not "some_keyXYZ" in test_obj.get_keys()
