    @Test
    public void testSimpleConstraint() {

        final String allVmsGoToPm3 = "create view constraint_simple as " +
                                     "select * from virtual_machine " +
                                     "check controllable__physical_machine = 'pm3'";
        final LoadBalance lb = new LoadBalance(Collections.singletonList(allVmsGoToPm3));
        addInventory(lb);
        final Result<? extends Record> results = lb.run();
        System.out.println(results);
        results.forEach(e -> assertEquals("pm3", e.get("CONTROLLABLE__PHYSICAL_MACHINE")));
    }