assertEquals("en", result[1].getValues()[0]);
        assertEquals("ja", result[1].getValues()[1]);
    }

    // Test addRewriter method
    @Test
    public void test_addRewriter() {
        SearchHelper.SearchRequestParamsRewriter rewriter = p -> p;

        searchHelper.addRewriter(rewriter);

        assertNotNull(searchHelper.searchRequestParamsRewriters);