@Test
    void testExplain() {
        Query q = new Query("?query=foo&explainLevel=2");
        assertEquals(2, q.getTrace().getExplainLevel());
        assertEquals(0, q.getTrace().getLevel());
    }
Test that we get the last value if a parameter is assigned multiple times
container-search/src/test/java/com/yahoo/search/test/QueryTestCase.java