718 lines
23 KiB
Python
718 lines
23 KiB
Python
import logging
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import re
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import sys
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import time
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import warnings
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from contextlib import contextmanager
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from functools import wraps
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from unittest import TestCase, skipIf, skipUnless
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from xml.dom.minidom import Node, parseString
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from django.apps import apps
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from django.apps.registry import Apps
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from django.conf import UserSettingsHolder, settings
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from django.core import mail
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from django.core.signals import request_started
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from django.db import reset_queries
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from django.db.models.options import Options
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from django.http import request
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from django.template import Template
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from django.test.signals import setting_changed, template_rendered
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from django.urls import get_script_prefix, set_script_prefix
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from django.utils import six
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from django.utils.decorators import available_attrs
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from django.utils.encoding import force_str
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from django.utils.translation import deactivate
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try:
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import jinja2
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except ImportError:
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jinja2 = None
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__all__ = (
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'Approximate', 'ContextList', 'isolate_lru_cache', 'get_runner',
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'modify_settings', 'override_settings',
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'requires_tz_support',
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'setup_test_environment', 'teardown_test_environment',
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)
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TZ_SUPPORT = hasattr(time, 'tzset')
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class Approximate(object):
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def __init__(self, val, places=7):
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self.val = val
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self.places = places
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def __repr__(self):
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return repr(self.val)
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def __eq__(self, other):
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if self.val == other:
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return True
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return round(abs(self.val - other), self.places) == 0
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class ContextList(list):
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"""A wrapper that provides direct key access to context items contained
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in a list of context objects.
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"""
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def __getitem__(self, key):
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if isinstance(key, six.string_types):
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for subcontext in self:
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if key in subcontext:
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return subcontext[key]
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raise KeyError(key)
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else:
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return super(ContextList, self).__getitem__(key)
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def __contains__(self, key):
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try:
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self[key]
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except KeyError:
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return False
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return True
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def keys(self):
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"""
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Flattened keys of subcontexts.
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"""
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keys = set()
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for subcontext in self:
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for dict in subcontext:
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keys |= set(dict.keys())
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return keys
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def instrumented_test_render(self, context):
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"""
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An instrumented Template render method, providing a signal
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that can be intercepted by the test system Client
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"""
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template_rendered.send(sender=self, template=self, context=context)
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return self.nodelist.render(context)
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def setup_test_environment():
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"""Perform any global pre-test setup. This involves:
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- Installing the instrumented test renderer
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- Set the email backend to the locmem email backend.
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- Setting the active locale to match the LANGUAGE_CODE setting.
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"""
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Template._original_render = Template._render
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Template._render = instrumented_test_render
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# Storing previous values in the settings module itself is problematic.
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# Store them in arbitrary (but related) modules instead. See #20636.
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mail._original_email_backend = settings.EMAIL_BACKEND
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settings.EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
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request._original_allowed_hosts = settings.ALLOWED_HOSTS
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settings.ALLOWED_HOSTS = ['*']
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mail.outbox = []
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deactivate()
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def teardown_test_environment():
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"""Perform any global post-test teardown. This involves:
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- Restoring the original test renderer
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- Restoring the email sending functions
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"""
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Template._render = Template._original_render
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del Template._original_render
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settings.EMAIL_BACKEND = mail._original_email_backend
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del mail._original_email_backend
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settings.ALLOWED_HOSTS = request._original_allowed_hosts
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del request._original_allowed_hosts
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del mail.outbox
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def get_runner(settings, test_runner_class=None):
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if not test_runner_class:
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test_runner_class = settings.TEST_RUNNER
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test_path = test_runner_class.split('.')
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# Allow for Python 2.5 relative paths
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if len(test_path) > 1:
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test_module_name = '.'.join(test_path[:-1])
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else:
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test_module_name = '.'
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test_module = __import__(test_module_name, {}, {}, force_str(test_path[-1]))
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test_runner = getattr(test_module, test_path[-1])
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return test_runner
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class TestContextDecorator(object):
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"""
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A base class that can either be used as a context manager during tests
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or as a test function or unittest.TestCase subclass decorator to perform
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temporary alterations.
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`attr_name`: attribute assigned the return value of enable() if used as
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a class decorator.
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`kwarg_name`: keyword argument passing the return value of enable() if
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used as a function decorator.
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"""
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def __init__(self, attr_name=None, kwarg_name=None):
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self.attr_name = attr_name
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self.kwarg_name = kwarg_name
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def enable(self):
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raise NotImplementedError
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def disable(self):
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raise NotImplementedError
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def __enter__(self):
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return self.enable()
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def __exit__(self, exc_type, exc_value, traceback):
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self.disable()
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def decorate_class(self, cls):
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if issubclass(cls, TestCase):
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decorated_setUp = cls.setUp
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decorated_tearDown = cls.tearDown
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def setUp(inner_self):
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context = self.enable()
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if self.attr_name:
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setattr(inner_self, self.attr_name, context)
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decorated_setUp(inner_self)
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def tearDown(inner_self):
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decorated_tearDown(inner_self)
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self.disable()
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cls.setUp = setUp
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cls.tearDown = tearDown
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return cls
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raise TypeError('Can only decorate subclasses of unittest.TestCase')
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def decorate_callable(self, func):
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@wraps(func, assigned=available_attrs(func))
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def inner(*args, **kwargs):
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with self as context:
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if self.kwarg_name:
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kwargs[self.kwarg_name] = context
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return func(*args, **kwargs)
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return inner
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def __call__(self, decorated):
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if isinstance(decorated, type):
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return self.decorate_class(decorated)
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elif callable(decorated):
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return self.decorate_callable(decorated)
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raise TypeError('Cannot decorate object of type %s' % type(decorated))
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class override_settings(TestContextDecorator):
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"""
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Acts as either a decorator or a context manager. If it's a decorator it
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takes a function and returns a wrapped function. If it's a contextmanager
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it's used with the ``with`` statement. In either event entering/exiting
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are called before and after, respectively, the function/block is executed.
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"""
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def __init__(self, **kwargs):
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self.options = kwargs
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super(override_settings, self).__init__()
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def enable(self):
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# Keep this code at the beginning to leave the settings unchanged
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# in case it raises an exception because INSTALLED_APPS is invalid.
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if 'INSTALLED_APPS' in self.options:
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try:
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apps.set_installed_apps(self.options['INSTALLED_APPS'])
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except Exception:
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apps.unset_installed_apps()
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raise
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override = UserSettingsHolder(settings._wrapped)
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for key, new_value in self.options.items():
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setattr(override, key, new_value)
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self.wrapped = settings._wrapped
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settings._wrapped = override
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for key, new_value in self.options.items():
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setting_changed.send(sender=settings._wrapped.__class__,
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setting=key, value=new_value, enter=True)
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def disable(self):
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if 'INSTALLED_APPS' in self.options:
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apps.unset_installed_apps()
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settings._wrapped = self.wrapped
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del self.wrapped
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for key in self.options:
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new_value = getattr(settings, key, None)
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setting_changed.send(sender=settings._wrapped.__class__,
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setting=key, value=new_value, enter=False)
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def save_options(self, test_func):
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if test_func._overridden_settings is None:
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test_func._overridden_settings = self.options
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else:
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# Duplicate dict to prevent subclasses from altering their parent.
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test_func._overridden_settings = dict(
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test_func._overridden_settings, **self.options)
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def decorate_class(self, cls):
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from django.test import SimpleTestCase
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if not issubclass(cls, SimpleTestCase):
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raise ValueError(
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"Only subclasses of Django SimpleTestCase can be decorated "
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"with override_settings")
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self.save_options(cls)
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return cls
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class modify_settings(override_settings):
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"""
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Like override_settings, but makes it possible to append, prepend or remove
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items instead of redefining the entire list.
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"""
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def __init__(self, *args, **kwargs):
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if args:
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# Hack used when instantiating from SimpleTestCase.setUpClass.
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assert not kwargs
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self.operations = args[0]
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else:
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assert not args
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self.operations = list(kwargs.items())
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super(override_settings, self).__init__()
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def save_options(self, test_func):
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if test_func._modified_settings is None:
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test_func._modified_settings = self.operations
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else:
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# Duplicate list to prevent subclasses from altering their parent.
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test_func._modified_settings = list(
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test_func._modified_settings) + self.operations
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def enable(self):
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self.options = {}
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for name, operations in self.operations:
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try:
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# When called from SimpleTestCase.setUpClass, values may be
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# overridden several times; cumulate changes.
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value = self.options[name]
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except KeyError:
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value = list(getattr(settings, name, []))
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for action, items in operations.items():
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# items my be a single value or an iterable.
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if isinstance(items, six.string_types):
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items = [items]
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if action == 'append':
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value = value + [item for item in items if item not in value]
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elif action == 'prepend':
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value = [item for item in items if item not in value] + value
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elif action == 'remove':
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value = [item for item in value if item not in items]
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else:
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raise ValueError("Unsupported action: %s" % action)
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self.options[name] = value
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super(modify_settings, self).enable()
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class override_system_checks(TestContextDecorator):
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"""
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Acts as a decorator. Overrides list of registered system checks.
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Useful when you override `INSTALLED_APPS`, e.g. if you exclude `auth` app,
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you also need to exclude its system checks.
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"""
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def __init__(self, new_checks, deployment_checks=None):
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from django.core.checks.registry import registry
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self.registry = registry
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self.new_checks = new_checks
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self.deployment_checks = deployment_checks
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super(override_system_checks, self).__init__()
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def enable(self):
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self.old_checks = self.registry.registered_checks
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self.registry.registered_checks = self.new_checks
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self.old_deployment_checks = self.registry.deployment_checks
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if self.deployment_checks is not None:
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self.registry.deployment_checks = self.deployment_checks
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def disable(self):
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self.registry.registered_checks = self.old_checks
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self.registry.deployment_checks = self.old_deployment_checks
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def compare_xml(want, got):
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"""Tries to do a 'xml-comparison' of want and got. Plain string
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comparison doesn't always work because, for example, attribute
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ordering should not be important. Comment nodes are not considered in the
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comparison. Leading and trailing whitespace is ignored on both chunks.
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Based on http://codespeak.net/svn/lxml/trunk/src/lxml/doctestcompare.py
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"""
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_norm_whitespace_re = re.compile(r'[ \t\n][ \t\n]+')
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def norm_whitespace(v):
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return _norm_whitespace_re.sub(' ', v)
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def child_text(element):
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return ''.join(c.data for c in element.childNodes
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if c.nodeType == Node.TEXT_NODE)
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def children(element):
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return [c for c in element.childNodes
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if c.nodeType == Node.ELEMENT_NODE]
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def norm_child_text(element):
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return norm_whitespace(child_text(element))
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def attrs_dict(element):
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return dict(element.attributes.items())
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def check_element(want_element, got_element):
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if want_element.tagName != got_element.tagName:
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return False
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if norm_child_text(want_element) != norm_child_text(got_element):
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return False
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if attrs_dict(want_element) != attrs_dict(got_element):
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return False
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want_children = children(want_element)
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got_children = children(got_element)
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if len(want_children) != len(got_children):
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return False
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for want, got in zip(want_children, got_children):
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if not check_element(want, got):
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return False
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return True
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def first_node(document):
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for node in document.childNodes:
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if node.nodeType != Node.COMMENT_NODE:
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return node
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want, got = strip_quotes(want, got)
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want = want.strip().replace('\\n', '\n')
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got = got.strip().replace('\\n', '\n')
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# If the string is not a complete xml document, we may need to add a
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# root element. This allow us to compare fragments, like "<foo/><bar/>"
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if not want.startswith('<?xml'):
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wrapper = '<root>%s</root>'
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want = wrapper % want
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got = wrapper % got
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# Parse the want and got strings, and compare the parsings.
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want_root = first_node(parseString(want))
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got_root = first_node(parseString(got))
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return check_element(want_root, got_root)
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def strip_quotes(want, got):
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"""
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Strip quotes of doctests output values:
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>>> strip_quotes("'foo'")
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"foo"
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>>> strip_quotes('"foo"')
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"foo"
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"""
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def is_quoted_string(s):
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s = s.strip()
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return len(s) >= 2 and s[0] == s[-1] and s[0] in ('"', "'")
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def is_quoted_unicode(s):
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s = s.strip()
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return len(s) >= 3 and s[0] == 'u' and s[1] == s[-1] and s[1] in ('"', "'")
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if is_quoted_string(want) and is_quoted_string(got):
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want = want.strip()[1:-1]
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got = got.strip()[1:-1]
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elif is_quoted_unicode(want) and is_quoted_unicode(got):
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want = want.strip()[2:-1]
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got = got.strip()[2:-1]
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return want, got
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def str_prefix(s):
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return s % {'_': '' if six.PY3 else 'u'}
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class CaptureQueriesContext(object):
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"""
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Context manager that captures queries executed by the specified connection.
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"""
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def __init__(self, connection):
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self.connection = connection
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def __iter__(self):
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return iter(self.captured_queries)
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def __getitem__(self, index):
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return self.captured_queries[index]
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def __len__(self):
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return len(self.captured_queries)
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@property
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def captured_queries(self):
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return self.connection.queries[self.initial_queries:self.final_queries]
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def __enter__(self):
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self.force_debug_cursor = self.connection.force_debug_cursor
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self.connection.force_debug_cursor = True
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self.initial_queries = len(self.connection.queries_log)
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self.final_queries = None
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request_started.disconnect(reset_queries)
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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self.connection.force_debug_cursor = self.force_debug_cursor
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request_started.connect(reset_queries)
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if exc_type is not None:
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return
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self.final_queries = len(self.connection.queries_log)
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class ignore_warnings(TestContextDecorator):
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def __init__(self, **kwargs):
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self.ignore_kwargs = kwargs
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if 'message' in self.ignore_kwargs or 'module' in self.ignore_kwargs:
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self.filter_func = warnings.filterwarnings
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else:
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self.filter_func = warnings.simplefilter
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super(ignore_warnings, self).__init__()
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def enable(self):
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self.catch_warnings = warnings.catch_warnings()
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self.catch_warnings.__enter__()
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self.filter_func('ignore', **self.ignore_kwargs)
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def disable(self):
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self.catch_warnings.__exit__(*sys.exc_info())
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@contextmanager
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def patch_logger(logger_name, log_level, log_kwargs=False):
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"""
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Context manager that takes a named logger and the logging level
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and provides a simple mock-like list of messages received
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"""
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calls = []
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def replacement(msg, *args, **kwargs):
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call = msg % args
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calls.append((call, kwargs) if log_kwargs else call)
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logger = logging.getLogger(logger_name)
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orig = getattr(logger, log_level)
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setattr(logger, log_level, replacement)
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try:
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yield calls
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finally:
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setattr(logger, log_level, orig)
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# On OSes that don't provide tzset (Windows), we can't set the timezone
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# in which the program runs. As a consequence, we must skip tests that
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# don't enforce a specific timezone (with timezone.override or equivalent),
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# or attempt to interpret naive datetimes in the default timezone.
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requires_tz_support = skipUnless(
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TZ_SUPPORT,
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"This test relies on the ability to run a program in an arbitrary "
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"time zone, but your operating system isn't able to do that."
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)
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@contextmanager
|
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def extend_sys_path(*paths):
|
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"""Context manager to temporarily add paths to sys.path."""
|
|
_orig_sys_path = sys.path[:]
|
|
sys.path.extend(paths)
|
|
try:
|
|
yield
|
|
finally:
|
|
sys.path = _orig_sys_path
|
|
|
|
|
|
@contextmanager
|
|
def isolate_lru_cache(lru_cache_object):
|
|
"""Clear the cache of an LRU cache object on entering and exiting."""
|
|
lru_cache_object.cache_clear()
|
|
try:
|
|
yield
|
|
finally:
|
|
lru_cache_object.cache_clear()
|
|
|
|
|
|
@contextmanager
|
|
def captured_output(stream_name):
|
|
"""Return a context manager used by captured_stdout/stdin/stderr
|
|
that temporarily replaces the sys stream *stream_name* with a StringIO.
|
|
|
|
Note: This function and the following ``captured_std*`` are copied
|
|
from CPython's ``test.support`` module."""
|
|
orig_stdout = getattr(sys, stream_name)
|
|
setattr(sys, stream_name, six.StringIO())
|
|
try:
|
|
yield getattr(sys, stream_name)
|
|
finally:
|
|
setattr(sys, stream_name, orig_stdout)
|
|
|
|
|
|
def captured_stdout():
|
|
"""Capture the output of sys.stdout:
|
|
|
|
with captured_stdout() as stdout:
|
|
print("hello")
|
|
self.assertEqual(stdout.getvalue(), "hello\n")
|
|
"""
|
|
return captured_output("stdout")
|
|
|
|
|
|
def captured_stderr():
|
|
"""Capture the output of sys.stderr:
|
|
|
|
with captured_stderr() as stderr:
|
|
print("hello", file=sys.stderr)
|
|
self.assertEqual(stderr.getvalue(), "hello\n")
|
|
"""
|
|
return captured_output("stderr")
|
|
|
|
|
|
def captured_stdin():
|
|
"""Capture the input to sys.stdin:
|
|
|
|
with captured_stdin() as stdin:
|
|
stdin.write('hello\n')
|
|
stdin.seek(0)
|
|
# call test code that consumes from sys.stdin
|
|
captured = input()
|
|
self.assertEqual(captured, "hello")
|
|
"""
|
|
return captured_output("stdin")
|
|
|
|
|
|
def reset_warning_registry():
|
|
"""
|
|
Clear warning registry for all modules. This is required in some tests
|
|
because of a bug in Python that prevents warnings.simplefilter("always")
|
|
from always making warnings appear: http://bugs.python.org/issue4180
|
|
|
|
The bug was fixed in Python 3.4.2.
|
|
"""
|
|
key = "__warningregistry__"
|
|
for mod in sys.modules.values():
|
|
if hasattr(mod, key):
|
|
getattr(mod, key).clear()
|
|
|
|
|
|
@contextmanager
|
|
def freeze_time(t):
|
|
"""
|
|
Context manager to temporarily freeze time.time(). This temporarily
|
|
modifies the time function of the time module. Modules which import the
|
|
time function directly (e.g. `from time import time`) won't be affected
|
|
This isn't meant as a public API, but helps reduce some repetitive code in
|
|
Django's test suite.
|
|
"""
|
|
_real_time = time.time
|
|
time.time = lambda: t
|
|
try:
|
|
yield
|
|
finally:
|
|
time.time = _real_time
|
|
|
|
|
|
def require_jinja2(test_func):
|
|
"""
|
|
Decorator to enable a Jinja2 template engine in addition to the regular
|
|
Django template engine for a test or skip it if Jinja2 isn't available.
|
|
"""
|
|
test_func = skipIf(jinja2 is None, "this test requires jinja2")(test_func)
|
|
test_func = override_settings(TEMPLATES=[{
|
|
'BACKEND': 'django.template.backends.django.DjangoTemplates',
|
|
'APP_DIRS': True,
|
|
}, {
|
|
'BACKEND': 'django.template.backends.jinja2.Jinja2',
|
|
'APP_DIRS': True,
|
|
'OPTIONS': {'keep_trailing_newline': True},
|
|
}])(test_func)
|
|
return test_func
|
|
|
|
|
|
class override_script_prefix(TestContextDecorator):
|
|
"""
|
|
Decorator or context manager to temporary override the script prefix.
|
|
"""
|
|
def __init__(self, prefix):
|
|
self.prefix = prefix
|
|
super(override_script_prefix, self).__init__()
|
|
|
|
def enable(self):
|
|
self.old_prefix = get_script_prefix()
|
|
set_script_prefix(self.prefix)
|
|
|
|
def disable(self):
|
|
set_script_prefix(self.old_prefix)
|
|
|
|
|
|
class LoggingCaptureMixin(object):
|
|
"""
|
|
Capture the output from the 'django' logger and store it on the class's
|
|
logger_output attribute.
|
|
"""
|
|
def setUp(self):
|
|
self.logger = logging.getLogger('django')
|
|
self.old_stream = self.logger.handlers[0].stream
|
|
self.logger_output = six.StringIO()
|
|
self.logger.handlers[0].stream = self.logger_output
|
|
|
|
def tearDown(self):
|
|
self.logger.handlers[0].stream = self.old_stream
|
|
|
|
|
|
class isolate_apps(TestContextDecorator):
|
|
"""
|
|
Act as either a decorator or a context manager to register models defined
|
|
in its wrapped context to an isolated registry.
|
|
|
|
The list of installed apps the isolated registry should contain must be
|
|
passed as arguments.
|
|
|
|
Two optional keyword arguments can be specified:
|
|
|
|
`attr_name`: attribute assigned the isolated registry if used as a class
|
|
decorator.
|
|
|
|
`kwarg_name`: keyword argument passing the isolated registry if used as a
|
|
function decorator.
|
|
"""
|
|
|
|
def __init__(self, *installed_apps, **kwargs):
|
|
self.installed_apps = installed_apps
|
|
super(isolate_apps, self).__init__(**kwargs)
|
|
|
|
def enable(self):
|
|
self.old_apps = Options.default_apps
|
|
apps = Apps(self.installed_apps)
|
|
setattr(Options, 'default_apps', apps)
|
|
return apps
|
|
|
|
def disable(self):
|
|
setattr(Options, 'default_apps', self.old_apps)
|
|
|
|
|
|
def tag(*tags):
|
|
"""
|
|
Decorator to add tags to a test class or method.
|
|
"""
|
|
def decorator(obj):
|
|
setattr(obj, 'tags', set(tags))
|
|
return obj
|
|
return decorator
|