test: validate the add/remove listener after the replicator start (#2830)
test: validate the add/remove listener after the replicator start (#2830)

* validate the add/remove listener after the replicator starts
couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios