private void assertCanonicalParse(String yqlQuery, String expectedQueryTree) {
        QueryTree qt  = parse(yqlQuery);
        assertNull(QueryCanonicalizer.canonicalize(qt));
        Query q = new Query();
        q.getModel().getQueryTree().setRoot(qt.getRoot());
        QueryRewrite.collapseSingleComposites(q);
        assertEquals(q.getModel().getQueryTree().toString(), expectedQueryTree);
    }
Verifies that we can search for a backslash
container-search/src/test/java/com/yahoo/search/yql/YqlParserTestCase.java