public final void fillContext(String dataId, String group) {
        this.dataId = dataId;
        this.group = group;
    }
@Test
    void testFillContext() {
        assertEquals(0, receivedMap.size());
        MockShardListener listener = new MockShardListener();
        listener.receiveConfigInfo(CONFIG_CONTENT);
        assertEquals(2, receivedMap.size());
        assertNull(receivedMap.get("group"));
        assertNull(receivedMap.get("dataId"));
        listener.fillContext("aaa", "ggg");
        listener.receiveConfigInfo(CONFIG_CONTENT);
        assertEquals(2, receivedMap.size());
        assertEquals("ggg", receivedMap.get("group"));
        assertEquals("aaa", receivedMap.get("dataId"));
    }