assertNotNull(result);
        assertTrue(result.contains("null"));
        assertTrue(result.endsWith("\n"));
    }

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

Shinsuke Sugaya <******@****.***> 1773442886 +0900