def test_fetch_public_key__calls_sender_key_fetcher(self, mock_fetch):
mock_fetcher = Mock(return_value="public key")
env = MagicEnvelope(author_handle="spam@eggs",
sender_key_fetcher=mock_fetcher)
env.fetch_public_key()
mock_fetcher.assert_called_once_with("spam@eggs")
assert not mock_fetch.called
def test_fetch_public_key__calls_fetch_public_key(self, mock_fetch):
env = MagicEnvelope(author_handle="spam@eggs")
env.fetch_public_key()
mock_fetch.assert_called_once_with("spam@eggs")
