@Test
public void testAppendProperties2() throws Exception {

    try {
        System.setProperty("dubbo.properties.two.i", "2");
        PropertiesConfig config = new PropertiesConfig("two");
        AbstractConfig.appendProperties(config);
        TestCase.assertEquals(2, config.getI());
    } finally {
        System.clearProperty("dubbo.properties.two.i");
    }
}