public boolean isStable() {
        return this.oldConf.isEmpty();
    }
@Test
    public void testIsStable() {
        ConfigurationEntry entry = TestUtils.getConfEntry("localhost:8081,localhost:8082,localhost:8083",
            "localhost:8080,localhost:8081,localhost:8082");
        assertFalse(entry.isStable());
        assertEquals(4, entry.listPeers().size());
        assertTrue(entry.contains(new PeerId("localhost", 8080)));
        assertTrue(entry.contains(new PeerId("localhost", 8081)));
        assertTrue(entry.contains(new PeerId("localhost", 8082)));
        assertTrue(entry.contains(new PeerId("localhost", 8083)));
    }