});
        final String result = systemHelper.updateConfiguration();
        assertTrue(result.contains("TestError:"));
        assertTrue(result.contains("Test error"));
    }

    public void test_getFilteredEnvMap_emptyKey() {
        envMap.put("", "value");
        envMap.put("VALID_KEY", "valid_value");

        final Map<String, String> filtered = systemHelper.getFilteredEnvMap(".*");