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123 lines
4.4 KiB
Python
123 lines
4.4 KiB
Python
# (c) 2014, Toshio Kuratomi <tkuratomi@ansible.com>
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#
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# This file is part of Ansible
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#
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# Ansible 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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# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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'''
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Compat module for Python3.x's unittest.mock module
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'''
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import sys
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# Python 2.7
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# Note: Could use the pypi mock library on python3.x as well as python2.x. It
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# is the same as the python3 stdlib mock library
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try:
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# Allow wildcard import because we really do want to import all of mock's
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# symbols into this compat shim
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# pylint: disable=wildcard-import,unused-wildcard-import
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from unittest.mock import *
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except ImportError:
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# Python 2
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# pylint: disable=wildcard-import,unused-wildcard-import
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try:
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from mock import *
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except ImportError:
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print('You need the mock library installed on python2.x to run tests')
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# Prior to 3.4.4, mock_open cannot handle binary read_data
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if sys.version_info >= (3,) and sys.version_info < (3, 4, 4):
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file_spec = None
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def _iterate_read_data(read_data):
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# Helper for mock_open:
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# Retrieve lines from read_data via a generator so that separate calls to
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# readline, read, and readlines are properly interleaved
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sep = b'\n' if isinstance(read_data, bytes) else '\n'
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data_as_list = [l + sep for l in read_data.split(sep)]
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if data_as_list[-1] == sep:
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# If the last line ended in a newline, the list comprehension will have an
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# extra entry that's just a newline. Remove this.
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data_as_list = data_as_list[:-1]
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else:
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# If there wasn't an extra newline by itself, then the file being
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# emulated doesn't have a newline to end the last line remove the
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# newline that our naive format() added
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data_as_list[-1] = data_as_list[-1][:-1]
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for line in data_as_list:
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yield line
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def mock_open(mock=None, read_data=''):
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"""
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A helper function to create a mock to replace the use of `open`. It works
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for `open` called directly or used as a context manager.
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The `mock` argument is the mock object to configure. If `None` (the
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default) then a `MagicMock` will be created for you, with the API limited
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to methods or attributes available on standard file handles.
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`read_data` is a string for the `read` methoddline`, and `readlines` of the
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file handle to return. This is an empty string by default.
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"""
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def _readlines_side_effect(*args, **kwargs):
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if handle.readlines.return_value is not None:
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return handle.readlines.return_value
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return list(_data)
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def _read_side_effect(*args, **kwargs):
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if handle.read.return_value is not None:
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return handle.read.return_value
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return type(read_data)().join(_data)
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def _readline_side_effect():
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if handle.readline.return_value is not None:
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while True:
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yield handle.readline.return_value
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for line in _data:
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yield line
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global file_spec
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if file_spec is None:
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import _io
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file_spec = list(set(dir(_io.TextIOWrapper)).union(set(dir(_io.BytesIO))))
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if mock is None:
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mock = MagicMock(name='open', spec=open)
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handle = MagicMock(spec=file_spec)
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handle.__enter__.return_value = handle
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_data = _iterate_read_data(read_data)
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handle.write.return_value = None
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handle.read.return_value = None
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handle.readline.return_value = None
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handle.readlines.return_value = None
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handle.read.side_effect = _read_side_effect
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handle.readline.side_effect = _readline_side_effect()
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handle.readlines.side_effect = _readlines_side_effect
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mock.return_value = handle
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return mock
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