    @Test
    public void testWithNullValues() throws Exception {

        ConstraintsModifier constraintsModifier = new ConstraintsModifier(network, config);
        try {
            constraintsModifier.looseConstraints(null, violations);
            fail();
        } catch (Throwable e) {

        }
        try {
            constraintsModifier.looseConstraints(StateManagerConstants.INITIAL_STATE_ID, null);
            fail();
        } catch (Throwable e) {
        }
    }