pytest-power

Adds a number of shorthands for fixtures and other helpers for easier testing:

• patch.object
• patch.init
• patch.many
• patch.everything

You can instal pytest-power with pip:

pip install pytest-power

Usage

patch.object

A shorthand for pytest-mock's mocker.patch.object

from myapp import App

def test_app_run(patch):
  patch.object(App, 'run')
  App.run()
  assert App.run.call_count == 1

You can pass keywords arguments as usual:

from myapp import App

def test_app_run(patch):
  patch.object(App, 'run', return_value='running')
  assert App.run() == 'running'

patch.init

Makes patching __init__ a bit simpler:

from myapp import App

def test_app_init(patch):
  patch.init(App)
  app = App()
  assert isinstance(app, App)

Instances patched in this way do not have properties that are set in __init__, so they have to be set again by hand.

Keyword arguments are passed to underlying patch.object, and autospec is enabled by default.

Multiple classes can be passed too:

patch.init(App, Cli)

patch.many

A shorthand to patch many properties of the same object:

from myapp import App

def test_app_run_called_by_run(patch):
  patch.many(App, ['run', 'called_by_run'])
  App.run()
  assert App.called_by_run.call_count == 1

Keyword arguments are again passed to underlying patch.object, and autospec is enabled by default.

patch.everything

A shorthand to patch every non-magic property. Useful when patch.many gets too long!

from myapp import App


def test_app_run_called_by_run(patch):
  patch.everything(App)
  App.run()
  assert App.called_by_run.call_count == 1

Supports forcing the exclusion of properties:

from myapp import App


def test_app_run(patch, excludes=['run']):
  patch.everything(App)
  App.run()
  assert App.called_by_run.call_count == 1

And forcing the inclusion of properties:

from myapp import App


def test_app_run(patch, includes=['__private__']):
  patch.everything(App)
  App.run()
  assert App.__private__.call_count == 1