@Override
    public Port port(String portId) {
        checkArgument(!Strings.isNullOrEmpty(portId), ERR_NULL_PORT_ID);
        return osNetworkStore.port(portId);
    }
@Test
    public void testGetPortById() {
        createBasicNetworks();
        assertTrue("Port did not match", target.port(PORT_ID) != null);
        assertTrue("Port did not match", target.port(UNKNOWN_ID) == null);
    }