}

    /**
     * Test isSearchField() with Set-based lookup.
     */
    @Test
    public void test_isSearchField_withSetBasedLookup() {
        // Test valid search fields
        assertTrue(queryCommand.isSearchField("title"));
        assertTrue(queryCommand.isSearchField("content"));
        assertTrue(queryCommand.isSearchField("url"));
        assertTrue(queryCommand.isSearchField("host"));