Fixtures

Useful mocks for os, random and tempfile and time.

fixtureresources.fixtures.create_patch(mpatch, request)

Helper method for creating patch for the patch functions implementing start and stop.

Args:

mpatch: e.g. return value of mock.patch()

request: pytest request.

fixtureresources.fixtures.mock_gettempdir(request)

Pytest mock fixture for tempfile.gettempdir(). The default return value is ‘tmp’.

fixtureresources.fixtures.mock_os_path_abspath(request)

Pytest mock fixture for os.path.abspath(). The default return value joins ‘abspath’ with given path.

For example:

def test_os_path_abspath(mock_os_path_abspath):
    assert os.path.abspath('path') == os.path.join('abspath', 'path')

fixtureresources.fixtures.mock_os_path_isfile(request)

Pytest mock fixture for os.path.isfile(). The default return value is True.

fixtureresources.fixtures.mock_os_walk(request)

Pytest mock fixture for os.walk(). The default os.walk() mock directory tree depth is 10 and all directories contains only ‘dir’ directory.

For example:

def test_os_walk(mock_os_walk):
    for _ in range(10):
        for _, dirs, _  in os.walk('foo/bar'):
            assert dirs == ['dir']

fixtureresources.fixtures.mock_randomchoice(request)

Pytest mock fixture for random.SystemRandom.choice(). Patched random.SystemRandom.choice() returns

choices[call_number % number_of_choices]

For example:

def test_randon(mock_randomchoice):
    assert (''.join(random.SystemRandom().choice(['a', 'b', 'c'])
                    for _ in range(5)) == 'abcab')

fixtureresources.fixtures.mock_time_sleep(request)

Pytest mock fixture for time.sleep().

MockFile

class fixtureresources.mockfile.MockFile(filename=None, content='', side_effect=None, args=None)

Simple string IO based mock for a file to be used via open.

Example usage:

>>> with MockFile(filename='foo.txt', content='bar') as mockfile:
...      with open('foo.txt', 'a') as f:
...          f.write('foo')
...      with open('foo.txt') as f:
...         print(f.read())
...
3L
barfoo
>>> def raise_io_error():
...     raise IOError('message')
...
>>> with MockFile(filename='filename',
...               side_effect=lambda *args: raise_io_error()):
...    open('filename')
...
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
  File "mockfile.py", line 123, in __enter__
    return self.mock_open_file(self.filename, self.args)
  File "mockfile.py", line 102, in mock_open_file
    self.side_effect(*args)
  File "<stdin>", line 2, in <lambda>
  File "<stdin>", line 2, in raise_io_error
IOError: message
>>>

Note

Tested only for one file at time and for text files.

set_content(content)

Set content

set_filename(filename)

Set filename

set_side_effect(side_effect)

Set side_effect

class fixtureresources.mockfile.SavedIO(content='', saver=None, mode=None)