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test_futures.py
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test_futures.py
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# Copyright 2017, Google LLC All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import threading
import mock
import pytest
from google.cloud.pubsub_v1 import exceptions
from google.cloud.pubsub_v1 import futures
def _future(*args, **kwargs):
return futures.Future(*args, **kwargs)
def test_constructor_defaults():
with mock.patch.object(threading, "Event", autospec=True) as Event:
future = _future()
assert future._result == futures.Future._SENTINEL
assert future._exception == futures.Future._SENTINEL
assert future._callbacks == []
assert future._completed is Event.return_value
Event.assert_called_once_with()
def test_constructor_explicit_completed():
completed = mock.sentinel.completed
future = _future(completed=completed)
assert future._result == futures.Future._SENTINEL
assert future._exception == futures.Future._SENTINEL
assert future._callbacks == []
assert future._completed is completed
def test_cancel():
assert _future().cancel() is False
def test_cancelled():
assert _future().cancelled() is False
def test_running():
future = _future()
assert future.running() is True
future.set_result("foobar")
assert future.running() is False
def test_done():
future = _future()
assert future.done() is False
future.set_result("12345")
assert future.done() is True
def test_exception_no_error():
future = _future()
future.set_result("12345")
assert future.exception() is None
def test_exception_with_error():
future = _future()
error = RuntimeError("Something really bad happened.")
future.set_exception(error)
# Make sure that the exception that is returned is the batch's error.
# Also check the type to ensure the batch's error did not somehow
# change internally.
assert future.exception() is error
assert isinstance(future.exception(), RuntimeError)
with pytest.raises(RuntimeError):
future.result()
def test_exception_timeout():
future = _future()
with pytest.raises(exceptions.TimeoutError):
future.exception(timeout=0.01)
def test_result_no_error():
future = _future()
future.set_result("42")
assert future.result() == "42"
def test_result_with_error():
future = _future()
future.set_exception(RuntimeError("Something really bad happened."))
with pytest.raises(RuntimeError):
future.result()
def test_add_done_callback_pending_batch():
future = _future()
callback = mock.Mock()
future.add_done_callback(callback)
assert len(future._callbacks) == 1
assert callback in future._callbacks
assert callback.call_count == 0
def test_add_done_callback_completed_batch():
future = _future()
future.set_result("12345")
callback = mock.Mock(spec=())
future.add_done_callback(callback)
callback.assert_called_once_with(future)
def test_trigger():
future = _future()
callback = mock.Mock(spec=())
future.add_done_callback(callback)
assert callback.call_count == 0
future.set_result("12345")
callback.assert_called_once_with(future)
def test_set_result_once_only():
future = _future()
future.set_result("12345")
with pytest.raises(RuntimeError):
future.set_result("67890")
def test_set_exception_once_only():
future = _future()
future.set_exception(ValueError("wah wah"))
with pytest.raises(RuntimeError):
future.set_exception(TypeError("other wah wah"))