@Test
    void testNGramRewritingPhraseSingleTerm() {
        Query q = new Query("?query=gram3:%22engul%22");
        createExecution().search(q);
        assertEquals("WEAKAND(100) (AND gram3:eng gram3:ngu gram3:gul)", q.getModel().getQueryTree().toString());
    }
Note that single-term phrases are simplified to just the term at parse time,
so the ngram rewriter cannot know to keep the grams as a phrase in this case.
container-search/src/test/java/com/yahoo/search/querytransform/test/NGramSearcherTestCase.java