def test_periodic_reaper(self, mock_reap):
""" Test that the we invoke the image reaper periodically """
image_manager = ImageManager(self.vim_client, self.ds_manager)
image_manager.monitor_for_cleanup(reap_interval=0.1)
self.assertFalse(image_manager._image_reaper is None)
retry = 0
while mock_reap.call_count < 2 and retry < 10:
time.sleep(0.1)
retry += 1
image_manager.cleanup()
assert_that(mock_reap.call_count, greater_than(1))
assert_that(retry, is_not(10), "reaper cleanup not called repeatedly")
