@Test
    void testNegativeMustHaveNegatives() {
        CompositeItem root = new NotItem();

        root.addItem(new WordItem("positive"));
        assertCanonicalized("positive", null, root);
    }
Multiple levels of RANK should collapse
container-search/src/test/java/com/yahoo/prelude/query/test/QueryCanonicalizerTestCase.java