assertNotNull(result);
        // Unicode characters may be escaped in JSON
        assertTrue(result.contains("テスト") || result.contains("\\u"));
    }

    @Test
    public void test_constantValue() {
        assertEquals('\n', NotificationHelper.LF);
    }

    @Test
    public void test_send_withBothConfigurations() {
        // Setup mock configuration with both webhook URLs