_____________________________ test_collection_add ______________________________
client = <google.cloud.firestore_v1.client.Client object at 0x7fb9ca171ad0>
cleanup = <built-in method append of list object at 0x7fb9c7c0acb0>
    def test_collection_add(client, cleanup):
        collection1 = client.collection("collek")
        collection2 = client.collection("collek", "shun", "child")
        collection3 = client.collection("collek", "table", "child")
        explicit_doc_id = "hula" + unique_resource_id("-")
>       assert set(collection1.list_documents()) == set()
E       assert set([<google....fb9c7c06290>]) == set([])
E         Extra items in the left set:
E         <google.cloud.firestore_v1.document.DocumentReference object at 0x7fb9c7c06290>
E         Full diff:
E         - set([<google.cloud.firestore_v1.document.DocumentReference object at 0x7fb9c7c06290>])
E + set([])