@Test
public void testGetUpdatedSignedDomainsNullDomains() {

    MockZMSFileChangeLogStore store = new MockZMSFileChangeLogStore(FSTORE_PATH, null, "0");
    SignedDomains domains = new SignedDomains();
    store.setSignedDomains(domains);
    StringBuilder str = new StringBuilder();
    assertNull(store.getUpdatedSignedDomains(str));
}