@Override
    public String getConfig(final String dataId) {
        return this.apolloClient.getItemValue(dataId);
    }
@Test
    public void testGetConfig2() {
        when(apolloClient.getItemValue(Mockito.any())).thenReturn("");
        assertEquals("", apolloDataChangedListener.getConfig("42"));
        verify(apolloClient).getItemValue(Mockito.any());
    }