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import sys
import time
import os
import warnings
from django.conf import settings
from django.core import mail
from django.core.mail.backends import locmem
from django.test import signals
from django.template import Template, loader, TemplateDoesNotExist
from django.template.loaders import cached
from django.utils.translation import deactivate
__all__ = ('Approximate', 'ContextList', 'setup_test_environment',
'teardown_test_environment', 'get_runner')
RESTORE_LOADERS_ATTR = '_original_template_source_loaders'
class Approximate(object):
def __init__(self, val, places=7):
self.val = val
self.places = places
def __repr__(self):
return repr(self.val)
def __eq__(self, other):
if self.val == other:
return True
return round(abs(self.val-other), self.places) == 0
class ContextList(list):
"""A wrapper that provides direct key access to context items contained
in a list of context objects.
"""
def __getitem__(self, key):
if isinstance(key, basestring):
for subcontext in self:
if key in subcontext:
return subcontext[key]
raise KeyError(key)
else:
return super(ContextList, self).__getitem__(key)
def __contains__(self, key):
try:
value = self[key]
except KeyError:
return False
return True
def instrumented_test_render(self, context):
"""
An instrumented Template render method, providing a signal
that can be intercepted by the test system Client
"""
signals.template_rendered.send(sender=self, template=self, context=context)
return self.nodelist.render(context)
def setup_test_environment():
"""Perform any global pre-test setup. This involves:
- Installing the instrumented test renderer
- Set the email backend to the locmem email backend.
- Setting the active locale to match the LANGUAGE_CODE setting.
"""
Template.original_render = Template._render
Template._render = instrumented_test_render
mail.original_SMTPConnection = mail.SMTPConnection
mail.SMTPConnection = locmem.EmailBackend
mail.original_email_backend = settings.EMAIL_BACKEND
settings.EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
mail.outbox = []
deactivate()
def teardown_test_environment():
"""Perform any global post-test teardown. This involves:
- Restoring the original test renderer
- Restoring the email sending functions
"""
Template._render = Template.original_render
del Template.original_render
mail.SMTPConnection = mail.original_SMTPConnection
del mail.original_SMTPConnection
settings.EMAIL_BACKEND = mail.original_email_backend
del mail.original_email_backend
del mail.outbox
def get_warnings_state():
"""
Returns an object containing the state of the warnings module
"""
# There is no public interface for doing this, but this implementation of
# get_warnings_state and restore_warnings_state appears to work on Python
# 2.4 to 2.7.
return warnings.filters[:]
def restore_warnings_state(state):
"""
Restores the state of the warnings module when passed an object that was
returned by get_warnings_state()
"""
warnings.filters = state[:]
def get_runner(settings):
test_path = settings.TEST_RUNNER.split('.')
# Allow for Python 2.5 relative paths
if len(test_path) > 1:
test_module_name = '.'.join(test_path[:-1])
else:
test_module_name = '.'
test_module = __import__(test_module_name, {}, {}, test_path[-1])
test_runner = getattr(test_module, test_path[-1])
return test_runner
def setup_test_template_loader(templates_dict, use_cached_loader=False):
"""
Changes Django to only find templates from within a dictionary (where each
key is the template name and each value is the corresponding template
content to return).
Use meth:`restore_template_loaders` to restore the original loaders.
"""
if hasattr(loader, RESTORE_LOADERS_ATTR):
raise Exception("loader.%s already exists" % RESTORE_LOADERS_ATTR)
def test_template_loader(template_name, template_dirs=None):
"A custom template loader that loads templates from a dictionary."
try:
return (templates_dict[template_name], "test:%s" % template_name)
except KeyError:
raise TemplateDoesNotExist(template_name)
if use_cached_loader:
template_loader = cached.Loader(('test_template_loader',))
template_loader._cached_loaders = (test_template_loader,)
else:
template_loader = test_template_loader
setattr(loader, RESTORE_LOADERS_ATTR, loader.template_source_loaders)
loader.template_source_loaders = (template_loader,)
return template_loader
def restore_template_loaders():
"""
Restores the original template loaders after
:meth:`setup_test_template_loader` has been run.
"""
loader.template_source_loaders = getattr(loader, RESTORE_LOADERS_ATTR)
delattr(loader, RESTORE_LOADERS_ATTR)
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