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110 lines
3.3 KiB
110 lines
3.3 KiB
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2020 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import io
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import types
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import asyncio
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import unittest.mock
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class _asyncio_patch:
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"""
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A wrapper around python patch supporting asyncio.
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Like the original patch you can use it as context
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manager (with)
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The original patch source code is the main source of
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inspiration:
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https://hg.python.org/cpython/file/3.4/Lib/unittest/mock.py
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"""
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def __init__(self, function, *args, **kwargs):
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self._function = function
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self._aync_magic_mock = AsyncioMagicMock(*args, **kwargs)
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def __enter__(self):
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"""Used when enter in the with block"""
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self._patcher = unittest.mock.patch(self._function, new=self._aync_magic_mock)
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mock_class = self._patcher.start()
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return mock_class
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def __exit__(self, *exc_info):
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"""Used when leaving the with block"""
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self._patcher.stop()
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def asyncio_patch(function, *args, **kwargs):
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return _asyncio_patch(function, *args, **kwargs)
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# monkey patch MagicMock,
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# FIXME: would probably be better to use asynctest or pytest.asyncio to test our asyncio code
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async def async_magic():
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pass
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unittest.mock.MagicMock.__await__ = lambda x: async_magic().__await__()
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class AsyncioMagicMock(unittest.mock.MagicMock):
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"""
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Magic mock returning coroutine
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"""
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try:
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__class__ = types.CoroutineType
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except AttributeError: # Not supported with Python 3.4
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__class__ = types.GeneratorType
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def __init__(self, return_value=None, **kwargs):
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"""
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:return_values: Array of return value at each call will return the next
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"""
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if return_value is not None:
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future = asyncio.Future()
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future.set_result(return_value)
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kwargs["return_value"] = future
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super().__init__(**kwargs)
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def _get_child_mock(self, **kw):
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"""Create the child mocks for attributes and return value.
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By default child mocks will be the same type as the parent.
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Subclasses of Mock may want to override this to customize the way
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child mocks are made.
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For non-callable mocks the callable variant will be used (rather than
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any custom subclass).
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Original code: https://github.com/python/cpython/blob/121f86338111e49c547a55eb7f26db919bfcbde9/Lib/unittest/mock.py
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"""
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return AsyncioMagicMock(**kw)
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class AsyncioBytesIO(io.BytesIO):
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"""
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An async wrapper around io.BytesIO to fake an
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async network connection
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"""
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async def read(self, length=-1):
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return super().read(length)
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async def write(self, data):
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return super().write(data)
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async def close(self):
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return super().close()
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