// Verify result handles null message properly
        assertNotNull(result);
        assertTrue(result.contains("null"));
        assertTrue(result.endsWith("\n"));
    }

    public void test_execute_withNestedExceptionCause() {
        // Setup mock SearchLogHelper that throws nested exception
        SearchLogHelper mockSearchLogHelper = new SearchLogHelper() {
            @Override
            public void storeSearchLog() {