// Expected exception
            assertTrue(e.getMessage().contains("non.existent.property"));
        }
    }

    // Test system property without prefix
    @Test
    public void test_get_systemPropertyWithoutPrefix() {
        // Set system property without FESS_CONFIG_PREFIX
        String testKey = "test.property";
        String systemValue = "wrong-system-value";
        System.setProperty(testKey, systemValue);