def test_layabout_can_reuse_an_existing_client_to_reconnect(monkeypatch):
"""
Test that layabout can reuse an existing SlackClient instance to reconnect
to the Slack API rather than needlessly instantiating a new one on each
reconnection attempt.
"""
layabout = Layabout()
# Fail initial connection, fail reconnection, succeed at last.
connections = (False, False, True)
SlackClient, _ = mock_slack(connections=connections)
monkeypatch.setattr('layabout.SlackClient', SlackClient)
# Retry connecting twice to verify reconnection logic was evaluated.
# until will exit early just to be safe.
layabout.run(connector=TOKEN,
retries=2,
backoff=lambda r: 0,
until=lambda e: False)
# Make sure the SlackClient was only instantiated once so we know that we
# reused the existing instance.
SlackClient.assert_called_once_with(token=TOKEN)
