René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"tests.unit.test_policy.TestPolicy: test_from_pb_empty failed","articleBody":"This test failed!\n\nTo configure my behavior, see [the Flaky Bot documentation](https://github.com/googleapis/repo-automation-bots/tree/master/packages/flakybot).\n\nIf I'm commenting on this issue too often, add the `flakybot: quiet` label and\nI will stop commenting.\n\n---\n\ncommit: 542737decf1391f01d4518a972af794a63f0ead9\nbuildURL: [Build Status](https://source.cloud.google.com/results/invocations/dbae0dc9-5c05-4453-81de-d7072bcc687c), [Sponge](http://sponge2/dbae0dc9-5c05-4453-81de-d7072bcc687c)\nstatus: failed\n\u003cdetails\u003e\u003csummary\u003eTest output\u003c/summary\u003e\u003cbr\u003e\u003cpre\u003eself = \u003ctests.unit.test_policy.TestPolicy testMethod=test_from_pb_empty\u003e\n\n    def test_from_pb_empty(self):\n        from google.iam.v1 import policy_pb2\n    \n        empty = frozenset()\n        message = policy_pb2.Policy()\n        klass = self._get_target_class()\n        policy = klass.from_pb(message)\n        self.assertEqual(policy.etag, b\"\")\n        self.assertEqual(policy.version, 0)\n        self.assertEqual(policy.bigtable_admins, empty)\n        self.assertEqual(policy.bigtable_readers, empty)\n        self.assertEqual(policy.bigtable_users, empty)\n        self.assertEqual(policy.bigtable_viewers, empty)\n\u003e       self.assertEqual(len(policy), 0)\nE       AssertionError: 4 != 0\n\ntests/unit/test_policy.py:103: AssertionError\u003c/pre\u003e\u003c/details\u003e","author":{"url":"https://github.com/flaky-bot[bot]","@type":"Person","name":"flaky-bot[bot]"},"datePublished":"2021-03-23T19:46:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/262/python-bigtable/issues/262"}