330 lines
10 KiB
Python
330 lines
10 KiB
Python
import re
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import warnings
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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.test.signals import template_rendered, setting_changed
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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.utils.translation import deactivate
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from django.utils.functional import wraps
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from django.utils import six
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__all__ = (
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'Approximate', 'ContextList', 'get_runner', 'override_settings',
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'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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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 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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mail.original_email_backend = settings.EMAIL_BACKEND
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settings.EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
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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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del mail.outbox
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def get_warnings_state():
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"""
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Returns an object containing the state of the warnings module
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"""
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# There is no public interface for doing this, but this implementation of
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# get_warnings_state and restore_warnings_state appears to work on Python
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# 2.4 to 2.7.
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return warnings.filters[:]
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def restore_warnings_state(state):
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"""
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Restores the state of the warnings module when passed an object that was
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returned by get_warnings_state()
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"""
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warnings.filters = state[:]
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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, {}, {}, 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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self.wrapped = settings._wrapped
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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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original_pre_setup = test_func._pre_setup
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original_post_teardown = test_func._post_teardown
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def _pre_setup(innerself):
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self.enable()
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original_pre_setup(innerself)
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def _post_teardown(innerself):
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original_post_teardown(innerself)
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self.disable()
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test_func._pre_setup = _pre_setup
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test_func._post_teardown = _post_teardown
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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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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)
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def disable(self):
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settings._wrapped = 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)
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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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