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helpers.py
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helpers.py
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'''This is a collection of helper functions for use in tests.
We want to avoid sharing test helper functions between test modules as
much as possible, and we definitely don't want to share test fixtures between
test modules, or to introduce a complex hierarchy of test class subclasses,
etc.
We want to reduce the amount of "travel" that a reader needs to undertake to
understand a test method -- reducing the number of other files they need to go
and read to understand what the test code does. And we want to avoid tightly
coupling test modules to each other by having them share code.
But some test helper functions just increase the readability of tests so much
and make writing tests so much easier, that it's worth having them despite the
potential drawbacks.
This module is reserved for these very useful functions.
'''
import os
import webtest
import pylons.config as config
import ckan.config.middleware
import ckan.model as model
import ckan.logic as logic
def reset_db():
'''Reset CKAN's database.
If a test class uses the database, then it should call this function in its
``setup()`` method to make sure that it has a clean database to start with
(nothing left over from other test classes or from previous test runs).
If a test class doesn't use the database (and most test classes shouldn't
need to) then it doesn't need to call this function.
:returns: ``None``
'''
# Close any database connections that have been left open.
# This prevents CKAN from hanging waiting for some unclosed connection.
model.Session.close_all()
model.repo.rebuild_db()
def call_action(action_name, context=None, **kwargs):
'''Call the named ``ckan.logic.action`` function and return the result.
This is just a nicer way for user code to call action functions, nicer than
either calling the action function directly or via
:py:func:`ckan.logic.get_action`.
For example::
user_dict = call_action('user_create', name='seanh',
email='seanh@seanh.com', password='pass')
Any keyword arguments given will be wrapped in a dict and passed to the
action function as its ``data_dict`` argument.
Note: this skips authorization! It passes 'ignore_auth': True to action
functions in their ``context`` dicts, so the corresponding authorization
functions will not be run.
This is because ckan.new_tests.logic.action tests only the actions, the
authorization functions are tested separately in
ckan.new_tests.logic.auth.
See the :doc:`testing guidelines </contributing/testing>` for more info.
This function should eventually be moved to
:py:func:`ckan.logic.call_action` and the current
:py:func:`ckan.logic.get_action` function should be
deprecated. The tests may still need their own wrapper function for
:py:func:`ckan.logic.call_action`, e.g. to insert ``'ignore_auth': True``
into the ``context`` dict.
:param action_name: the name of the action function to call, e.g.
``'user_update'``
:type action_name: string
:param context: the context dict to pass to the action function
(optional, if no context is given a default one will be supplied)
:type context: dict
:returns: the dict or other value that the action function returns
'''
if context is None:
context = {}
context.setdefault('user', '127.0.0.1')
context.setdefault('ignore_auth', True)
return logic.get_action(action_name)(context=context, data_dict=kwargs)
def call_auth(auth_name, context, **kwargs):
'''Call the named ``ckan.logic.auth`` function and return the result.
This is just a convenience function for tests in
:py:mod:`ckan.new_tests.logic.auth` to use.
Usage::
result = helpers.call_auth('user_update', context=context,
id='some_user_id',
name='updated_user_name')
:param auth_name: the name of the auth function to call, e.g.
``'user_update'``
:type auth_name: string
:param context: the context dict to pass to the auth function, must
contain ``'user'`` and ``'model'`` keys,
e.g. ``{'user': 'fred', 'model': my_mock_model_object}``
:type context: dict
:returns: the dict that the auth function returns, e.g.
``{'success': True}`` or ``{'success': False, msg: '...'}``
or just ``{'success': False}``
:rtype: dict
'''
assert 'user' in context, ('Test methods must put a user name in the '
'context dict')
assert 'model' in context, ('Test methods must put a model in the '
'context dict')
return logic.check_access(auth_name, context, data_dict=kwargs)
def _get_test_app():
'''Return a webtest.TestApp for CKAN, with legacy templates disabled.
For functional tests that need to request CKAN pages or post to the API.
Unit tests shouldn't need this.
'''
config['ckan.legacy_templates'] = False
app = ckan.config.middleware.make_app(config['global_conf'], **config)
app = webtest.TestApp(app)
return app
class FunctionalTestBaseClass():
'''A base class for functional test classes to inherit from.
Allows configuration changes by overriding _apply_config_changes and
resetting the CKAN config after your test class has run. It creates a
webtest.TestApp at self.app for your class to use to make HTTP requests
to the CKAN web UI or API.
If you're overriding methods that this class provides, like setup_class()
and teardown_class(), make sure to use super() to call this class's methods
at the top of yours!
'''
@classmethod
def setup_class(cls):
# Make a copy of the Pylons config, so we can restore it in teardown.
cls.original_config = config.copy()
cls._apply_config_changes(config)
cls.app = _get_test_app()
@classmethod
def _apply_config_changes(cls, cfg):
pass
def setup(self):
import ckan.model as model
model.Session.close_all()
model.repo.rebuild_db()
@classmethod
def teardown_class(cls):
# Restore the Pylons config to its original values, in case any tests
# changed any config settings.
config.clear()
config.update(cls.original_config)
## FIXME: remove webtest_* functions below when we upgrade webtest
def webtest_submit(form, name=None, index=None, value=None, **args):
'''
backported version of webtest.Form.submit that actually works
for submitting with different submit buttons.
We're stuck on an old version of webtest because we're stuck
on an old version of webob because we're stuck on an old version
of Pylons. This prolongs our suffering, but on the bright side
it lets us have functional tests that work.
'''
fields = webtest_submit_fields(form, name, index=index, submit_value=value)
if form.method.upper() != "GET":
args.setdefault("content_type", form.enctype)
return form.response.goto(form.action, method=form.method,
params=fields, **args)
def webtest_submit_fields(form, name=None, index=None, submit_value=None):
'''
backported version of webtest.Form.submit_fields that actually works
for submitting with different submit buttons.
'''
from webtest.app import File
submit = []
# Use another name here so we can keep function param the same for BWC.
submit_name = name
if index is not None and submit_value is not None:
raise ValueError("Can't specify both submit_value and index.")
# If no particular button was selected, use the first one
if index is None and submit_value is None:
index = 0
# This counts all fields with the submit name not just submit fields.
current_index = 0
for name, field in form.field_order:
if name is None: # pragma: no cover
continue
if submit_name is not None and name == submit_name:
if index is not None and current_index == index:
submit.append((name, field.value_if_submitted()))
if submit_value is not None and \
field.value_if_submitted() == submit_value:
submit.append((name, field.value_if_submitted()))
current_index += 1
else:
value = field.value
if value is None:
continue
if isinstance(field, File):
submit.append((name, field))
continue
if isinstance(value, list):
for item in value:
submit.append((name, item))
else:
submit.append((name, value))
return submit