@Test
public void testGetServerDomainModifiedListException() {

    MockZMSFileChangeLogStore fstore = new MockZMSFileChangeLogStore(FSTORE_PATH, null, null);
    ZMSClient zmsClient = Mockito.mock(ZMSClient.class);
    fstore.setZMSClient(zmsClient);
    Mockito.when(zmsClient.getSignedDomains(null, "true", null, null))
            .thenThrow(new ZMSClientException(500, "invalid server error:"));
    SignedDomains returnList = fstore.getServerDomainModifiedList();
    assertNull(returnList);
}