1 files changed, 228 insertions, 0 deletions
diff --git a/tests/asyncio/future/test_async_future.py b/tests/asyncio/future/test_async_future.py
new file mode 100644
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+++ b/tests/asyncio/future/test_async_future.py
@@ -0,0 +1,228 @@
+# Copyright 2017, Google LLC
+#
+# 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 asyncio
+
+import mock
+import pytest
+
+from google.api_core import exceptions
+from google.api_core.future import async_future
+
+
+class AsyncFuture(async_future.AsyncFuture):
+    async def done(self):
+        return False
+
+    async def cancel(self):
+        return True
+
+    async def cancelled(self):
+        return False
+
+    async def running(self):
+        return True
+
+
+@pytest.mark.asyncio
+async def test_polling_future_constructor():
+    future = AsyncFuture()
+    assert not await future.done()
+    assert not await future.cancelled()
+    assert await future.running()
+    assert await future.cancel()
+
+
+@pytest.mark.asyncio
+async def test_set_result():
+    future = AsyncFuture()
+    callback = mock.Mock()
+
+    future.set_result(1)
+
+    assert await future.result() == 1
+    callback_called = asyncio.Event()
+
+    def callback(unused_future):
+        callback_called.set()
+
+    future.add_done_callback(callback)
+    await callback_called.wait()
+
+
+@pytest.mark.asyncio
+async def test_set_exception():
+    future = AsyncFuture()
+    exception = ValueError("meep")
+
+    future.set_exception(exception)
+
+    assert await future.exception() == exception
+    with pytest.raises(ValueError):
+        await future.result()
+
+    callback_called = asyncio.Event()
+
+    def callback(unused_future):
+        callback_called.set()
+
+    future.add_done_callback(callback)
+    await callback_called.wait()
+
+
+@pytest.mark.asyncio
+async def test_invoke_callback_exception():
+    future = AsyncFuture()
+    future.set_result(42)
+
+    # This should not raise, despite the callback causing an exception.
+    callback_called = asyncio.Event()
+
+    def callback(unused_future):
+        callback_called.set()
+        raise ValueError()
+
+    future.add_done_callback(callback)
+    await callback_called.wait()
+
+
+class AsyncFutureWithPoll(AsyncFuture):
+    def __init__(self):
+        super().__init__()
+        self.poll_count = 0
+        self.event = asyncio.Event()
+
+    async def done(self):
+        self.poll_count += 1
+        await self.event.wait()
+        self.set_result(42)
+        return True
+
+
+@pytest.mark.asyncio
+async def test_result_with_polling():
+    future = AsyncFutureWithPoll()
+
+    future.event.set()
+    result = await future.result()
+
+    assert result == 42
+    assert future.poll_count == 1
+    # Repeated calls should not cause additional polling
+    assert await future.result() == result
+    assert future.poll_count == 1
+
+
+class AsyncFutureTimeout(AsyncFutureWithPoll):
+    async def done(self):
+        await asyncio.sleep(0.2)
+        return False
+
+
+@pytest.mark.asyncio
+async def test_result_timeout():
+    future = AsyncFutureTimeout()
+    with pytest.raises(asyncio.TimeoutError):
+        await future.result(timeout=0.2)
+
+
+@pytest.mark.asyncio
+async def test_exception_timeout():
+    future = AsyncFutureTimeout()
+    with pytest.raises(asyncio.TimeoutError):
+        await future.exception(timeout=0.2)
+
+
+@pytest.mark.asyncio
+async def test_result_timeout_with_retry():
+    future = AsyncFutureTimeout()
+    with pytest.raises(asyncio.TimeoutError):
+        await future.exception(timeout=0.4)
+
+
+class AsyncFutureTransient(AsyncFutureWithPoll):
+    def __init__(self, errors):
+        super().__init__()
+        self._errors = errors
+
+    async def done(self):
+        if self._errors:
+            error, self._errors = self._errors[0], self._errors[1:]
+            raise error("testing")
+        self.poll_count += 1
+        self.set_result(42)
+        return True
+
+
+@mock.patch("asyncio.sleep", autospec=True)
+@pytest.mark.asyncio
+async def test_result_transient_error(unused_sleep):
+    future = AsyncFutureTransient(
+        (
+            exceptions.TooManyRequests,
+            exceptions.InternalServerError,
+            exceptions.BadGateway,
+        )
+    )
+    result = await future.result()
+    assert result == 42
+    assert future.poll_count == 1
+    # Repeated calls should not cause additional polling
+    assert await future.result() == result
+    assert future.poll_count == 1
+
+
+@pytest.mark.asyncio
+async def test_callback_concurrency():
+    future = AsyncFutureWithPoll()
+
+    callback_called = asyncio.Event()
+
+    def callback(unused_future):
+        callback_called.set()
+
+    future.add_done_callback(callback)
+
+    # Give the thread a second to poll
+    await asyncio.sleep(1)
+    assert future.poll_count == 1
+
+    future.event.set()
+    await callback_called.wait()
+
+
+@pytest.mark.asyncio
+async def test_double_callback_concurrency():
+    future = AsyncFutureWithPoll()
+
+    callback_called = asyncio.Event()
+
+    def callback(unused_future):
+        callback_called.set()
+
+    callback_called2 = asyncio.Event()
+
+    def callback2(unused_future):
+        callback_called2.set()
+
+    future.add_done_callback(callback)
+    future.add_done_callback(callback2)
+
+    # Give the thread a second to poll
+    await asyncio.sleep(1)
+    future.event.set()
+
+    assert future.poll_count == 1
+    await callback_called.wait()
+    await callback_called2.wait()