assertNotNull(keywords);
        assertEquals(0, keywords.length); // Should return empty array
    }

    // Additional tests for escapeWildcardQuery
    @Test
    public void testEscapeWildcardQueryWithMixedContent() {
        // Test with realistic query containing wildcards and regular text
        String query = "find*all?documents.pdf";
        String escaped = SuggestUtil.escapeWildcardQuery(query);