mirror of
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949076eb11
When both parent and child classes are decorated with override_settings, child class settings should take precedence. Thanks Sephi for the report and Marc Tamlyn for the review.
425 lines
14 KiB
Python
425 lines
14 KiB
Python
from contextlib import contextmanager
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import logging
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import re
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import sys
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import time
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from unittest import skipUnless
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import warnings
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from functools import wraps
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from xml.dom.minidom import parseString, Node
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from django.conf import settings, UserSettingsHolder
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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.http import request
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from django.template import Template, loader, TemplateDoesNotExist
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from django.template.loaders import cached
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from django.test.signals import template_rendered, setting_changed
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from django.utils.encoding import force_str
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from django.utils import six
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from django.utils.translation import deactivate
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__all__ = (
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'Approximate', 'ContextList', 'get_runner', 'override_settings',
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'requires_tz_support', 'setup_test_environment', 'teardown_test_environment',
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)
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RESTORE_LOADERS_ATTR = '_original_template_source_loaders'
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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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def setup_test_template_loader(templates_dict, use_cached_loader=False):
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"""
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Changes Django to only find templates from within a dictionary (where each
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key is the template name and each value is the corresponding template
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content to return).
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Use meth:`restore_template_loaders` to restore the original loaders.
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"""
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if hasattr(loader, RESTORE_LOADERS_ATTR):
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raise Exception("loader.%s already exists" % RESTORE_LOADERS_ATTR)
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def test_template_loader(template_name, template_dirs=None):
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"A custom template loader that loads templates from a dictionary."
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try:
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return (templates_dict[template_name], "test:%s" % template_name)
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except KeyError:
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raise TemplateDoesNotExist(template_name)
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if use_cached_loader:
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template_loader = cached.Loader(('test_template_loader',))
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template_loader._cached_loaders = (test_template_loader,)
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else:
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template_loader = test_template_loader
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setattr(loader, RESTORE_LOADERS_ATTR, loader.template_source_loaders)
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loader.template_source_loaders = (template_loader,)
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return template_loader
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def restore_template_loaders():
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"""
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Restores the original template loaders after
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:meth:`setup_test_template_loader` has been run.
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"""
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loader.template_source_loaders = getattr(loader, RESTORE_LOADERS_ATTR)
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delattr(loader, RESTORE_LOADERS_ATTR)
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class override_settings(object):
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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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def __enter__(self):
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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 __call__(self, test_func):
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from django.test import SimpleTestCase
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if isinstance(test_func, type):
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if not issubclass(test_func, SimpleTestCase):
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raise Exception(
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"Only subclasses of Django SimpleTestCase can be decorated "
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"with override_settings")
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if test_func._custom_settings:
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test_func._custom_settings = dict(
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test_func._custom_settings, **self.options)
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else:
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test_func._custom_settings = self.options
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return test_func
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else:
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@wraps(test_func)
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def inner(*args, **kwargs):
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with self:
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return test_func(*args, **kwargs)
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return inner
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def enable(self):
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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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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 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.
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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.replace('\\n','\n')
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got = got.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
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and s[0] == s[-1]
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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
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and s[0] == 'u'
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and s[1] == s[-1]
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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.use_debug_cursor = self.connection.use_debug_cursor
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self.connection.use_debug_cursor = True
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self.initial_queries = len(self.connection.queries)
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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.use_debug_cursor = self.use_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)
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class IgnoreDeprecationWarningsMixin(object):
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warning_classes = [DeprecationWarning]
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def setUp(self):
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super(IgnoreDeprecationWarningsMixin, self).setUp()
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self.catch_warnings = warnings.catch_warnings()
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self.catch_warnings.__enter__()
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for warning_class in self.warning_classes:
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warnings.filterwarnings("ignore", category=warning_class)
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def tearDown(self):
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self.catch_warnings.__exit__(*sys.exc_info())
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super(IgnoreDeprecationWarningsMixin, self).tearDown()
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class IgnorePendingDeprecationWarningsMixin(IgnoreDeprecationWarningsMixin):
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warning_classes = [PendingDeprecationWarning]
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class IgnoreAllDeprecationWarningsMixin(IgnoreDeprecationWarningsMixin):
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warning_classes = [PendingDeprecationWarning, DeprecationWarning]
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@contextmanager
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def patch_logger(logger_name, log_level):
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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):
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calls.append(msg)
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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(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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