224 lines
7.1 KiB
Python
224 lines
7.1 KiB
Python
import warnings
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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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__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, basestring):
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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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value = 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 TransactionTestCase
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if isinstance(test_func, type) and issubclass(test_func, TransactionTestCase):
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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 str_prefix(s):
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return s % {'_': 'u'}
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