import logging
import re
import sys
import time
import warnings
from contextlib import contextmanager
from functools import wraps
from unittest import TestCase, skipIf, skipUnless
from xml.dom.minidom import Node, parseString
from django.apps import apps
from django.apps.registry import Apps
from django.conf import UserSettingsHolder, settings
from django.core import mail
from django.core.signals import request_started
from django.db import reset_queries
from django.db.models.options import Options
from django.http import request
from django.template import Template
from django.test.signals import setting_changed, template_rendered
from django.urls import get_script_prefix, set_script_prefix
from django.utils import six
from django.utils.decorators import available_attrs
from django.utils.encoding import force_str
from django.utils.translation import deactivate
try:
import jinja2
except ImportError:
jinja2 = None
__all__ = (
'Approximate', 'ContextList', 'isolate_lru_cache', 'get_runner',
'modify_settings', 'override_settings',
'requires_tz_support',
'setup_test_environment', 'teardown_test_environment',
)
TZ_SUPPORT = hasattr(time, 'tzset')
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, six.string_types):
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:
self[key]
except KeyError:
return False
return True
def keys(self):
"""
Flattened keys of subcontexts.
"""
keys = set()
for subcontext in self:
for dict in subcontext:
keys |= set(dict.keys())
return keys
def instrumented_test_render(self, context):
"""
An instrumented Template render method, providing a signal
that can be intercepted by the test system Client
"""
template_rendered.send(sender=self, template=self, context=context)
return self.nodelist.render(context)
def setup_test_environment():
"""
Perform global pre-test setup, such as installing the instrumented template
renderer and setting the email backend to the locmem email backend.
"""
Template._original_render = Template._render
Template._render = instrumented_test_render
# Storing previous values in the settings module itself is problematic.
# Store them in arbitrary (but related) modules instead. See #20636.
mail._original_email_backend = settings.EMAIL_BACKEND
settings.EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
request._original_allowed_hosts = settings.ALLOWED_HOSTS
settings.ALLOWED_HOSTS = ['*']
mail.outbox = []
deactivate()
def teardown_test_environment():
"""
Perform any global post-test teardown, such as restoring the original
template renderer and restoring the email sending functions.
"""
Template._render = Template._original_render
del Template._original_render
settings.EMAIL_BACKEND = mail._original_email_backend
del mail._original_email_backend
settings.ALLOWED_HOSTS = request._original_allowed_hosts
del request._original_allowed_hosts
del mail.outbox
def get_runner(settings, test_runner_class=None):
if not test_runner_class:
test_runner_class = settings.TEST_RUNNER
test_path = test_runner_class.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, {}, {}, force_str(test_path[-1]))
test_runner = getattr(test_module, test_path[-1])
return test_runner
class TestContextDecorator(object):
"""
A base class that can either be used as a context manager during tests
or as a test function or unittest.TestCase subclass decorator to perform
temporary alterations.
`attr_name`: attribute assigned the return value of enable() if used as
a class decorator.
`kwarg_name`: keyword argument passing the return value of enable() if
used as a function decorator.
"""
def __init__(self, attr_name=None, kwarg_name=None):
self.attr_name = attr_name
self.kwarg_name = kwarg_name
def enable(self):
raise NotImplementedError
def disable(self):
raise NotImplementedError
def __enter__(self):
return self.enable()
def __exit__(self, exc_type, exc_value, traceback):
self.disable()
def decorate_class(self, cls):
if issubclass(cls, TestCase):
decorated_setUp = cls.setUp
decorated_tearDown = cls.tearDown
def setUp(inner_self):
context = self.enable()
if self.attr_name:
setattr(inner_self, self.attr_name, context)
decorated_setUp(inner_self)
def tearDown(inner_self):
decorated_tearDown(inner_self)
self.disable()
cls.setUp = setUp
cls.tearDown = tearDown
return cls
raise TypeError('Can only decorate subclasses of unittest.TestCase')
def decorate_callable(self, func):
@wraps(func, assigned=available_attrs(func))
def inner(*args, **kwargs):
with self as context:
if self.kwarg_name:
kwargs[self.kwarg_name] = context
return func(*args, **kwargs)
return inner
def __call__(self, decorated):
if isinstance(decorated, type):
return self.decorate_class(decorated)
elif callable(decorated):
return self.decorate_callable(decorated)
raise TypeError('Cannot decorate object of type %s' % type(decorated))
class override_settings(TestContextDecorator):
"""
Acts as either a decorator or a context manager. If it's a decorator it
takes a function and returns a wrapped function. If it's a contextmanager
it's used with the ``with`` statement. In either event entering/exiting
are called before and after, respectively, the function/block is executed.
"""
def __init__(self, **kwargs):
self.options = kwargs
super(override_settings, self).__init__()
def enable(self):
# Keep this code at the beginning to leave the settings unchanged
# in case it raises an exception because INSTALLED_APPS is invalid.
if 'INSTALLED_APPS' in self.options:
try:
apps.set_installed_apps(self.options['INSTALLED_APPS'])
except Exception:
apps.unset_installed_apps()
raise
override = UserSettingsHolder(settings._wrapped)
for key, new_value in self.options.items():
setattr(override, key, new_value)
self.wrapped = settings._wrapped
settings._wrapped = override
for key, new_value in self.options.items():
setting_changed.send(sender=settings._wrapped.__class__,
setting=key, value=new_value, enter=True)
def disable(self):
if 'INSTALLED_APPS' in self.options:
apps.unset_installed_apps()
settings._wrapped = self.wrapped
del self.wrapped
for key in self.options:
new_value = getattr(settings, key, None)
setting_changed.send(sender=settings._wrapped.__class__,
setting=key, value=new_value, enter=False)
def save_options(self, test_func):
if test_func._overridden_settings is None:
test_func._overridden_settings = self.options
else:
# Duplicate dict to prevent subclasses from altering their parent.
test_func._overridden_settings = dict(
test_func._overridden_settings, **self.options)
def decorate_class(self, cls):
from django.test import SimpleTestCase
if not issubclass(cls, SimpleTestCase):
raise ValueError(
"Only subclasses of Django SimpleTestCase can be decorated "
"with override_settings")
self.save_options(cls)
return cls
class modify_settings(override_settings):
"""
Like override_settings, but makes it possible to append, prepend or remove
items instead of redefining the entire list.
"""
def __init__(self, *args, **kwargs):
if args:
# Hack used when instantiating from SimpleTestCase.setUpClass.
assert not kwargs
self.operations = args[0]
else:
assert not args
self.operations = list(kwargs.items())
super(override_settings, self).__init__()
def save_options(self, test_func):
if test_func._modified_settings is None:
test_func._modified_settings = self.operations
else:
# Duplicate list to prevent subclasses from altering their parent.
test_func._modified_settings = list(
test_func._modified_settings) + self.operations
def enable(self):
self.options = {}
for name, operations in self.operations:
try:
# When called from SimpleTestCase.setUpClass, values may be
# overridden several times; cumulate changes.
value = self.options[name]
except KeyError:
value = list(getattr(settings, name, []))
for action, items in operations.items():
# items my be a single value or an iterable.
if isinstance(items, six.string_types):
items = [items]
if action == 'append':
value = value + [item for item in items if item not in value]
elif action == 'prepend':
value = [item for item in items if item not in value] + value
elif action == 'remove':
value = [item for item in value if item not in items]
else:
raise ValueError("Unsupported action: %s" % action)
self.options[name] = value
super(modify_settings, self).enable()
class override_system_checks(TestContextDecorator):
"""
Acts as a decorator. Overrides list of registered system checks.
Useful when you override `INSTALLED_APPS`, e.g. if you exclude `auth` app,
you also need to exclude its system checks.
"""
def __init__(self, new_checks, deployment_checks=None):
from django.core.checks.registry import registry
self.registry = registry
self.new_checks = new_checks
self.deployment_checks = deployment_checks
super(override_system_checks, self).__init__()
def enable(self):
self.old_checks = self.registry.registered_checks
self.registry.registered_checks = self.new_checks
self.old_deployment_checks = self.registry.deployment_checks
if self.deployment_checks is not None:
self.registry.deployment_checks = self.deployment_checks
def disable(self):
self.registry.registered_checks = self.old_checks
self.registry.deployment_checks = self.old_deployment_checks
def compare_xml(want, got):
"""Tries to do a 'xml-comparison' of want and got. Plain string
comparison doesn't always work because, for example, attribute
ordering should not be important. Comment nodes are not considered in the
comparison. Leading and trailing whitespace is ignored on both chunks.
Based on https://github.com/lxml/lxml/blob/master/src/lxml/doctestcompare.py
"""
_norm_whitespace_re = re.compile(r'[ \t\n][ \t\n]+')
def norm_whitespace(v):
return _norm_whitespace_re.sub(' ', v)
def child_text(element):
return ''.join(c.data for c in element.childNodes
if c.nodeType == Node.TEXT_NODE)
def children(element):
return [c for c in element.childNodes
if c.nodeType == Node.ELEMENT_NODE]
def norm_child_text(element):
return norm_whitespace(child_text(element))
def attrs_dict(element):
return dict(element.attributes.items())
def check_element(want_element, got_element):
if want_element.tagName != got_element.tagName:
return False
if norm_child_text(want_element) != norm_child_text(got_element):
return False
if attrs_dict(want_element) != attrs_dict(got_element):
return False
want_children = children(want_element)
got_children = children(got_element)
if len(want_children) != len(got_children):
return False
for want, got in zip(want_children, got_children):
if not check_element(want, got):
return False
return True
def first_node(document):
for node in document.childNodes:
if node.nodeType != Node.COMMENT_NODE:
return node
want, got = strip_quotes(want, got)
want = want.strip().replace('\\n', '\n')
got = got.strip().replace('\\n', '\n')
# If the string is not a complete xml document, we may need to add a
# root element. This allow us to compare fragments, like "<foo/><bar/>"
if not want.startswith('<?xml'):
wrapper = '<root>%s</root>'
want = wrapper % want
got = wrapper % got
# Parse the want and got strings, and compare the parsings.
want_root = first_node(parseString(want))
got_root = first_node(parseString(got))
return check_element(want_root, got_root)
def strip_quotes(want, got):
"""
Strip quotes of doctests output values:
>>> strip_quotes("'foo'")
"foo"
>>> strip_quotes('"foo"')
"foo"
"""
def is_quoted_string(s):
s = s.strip()
return len(s) >= 2 and s[0] == s[-1] and s[0] in ('"', "'")
def is_quoted_unicode(s):
s = s.strip()
return len(s) >= 3 and s[0] == 'u' and s[1] == s[-1] and s[1] in ('"', "'")
if is_quoted_string(want) and is_quoted_string(got):
want = want.strip()[1:-1]
got = got.strip()[1:-1]
elif is_quoted_unicode(want) and is_quoted_unicode(got):
want = want.strip()[2:-1]
got = got.strip()[2:-1]
return want, got
def str_prefix(s):
return s % {'_': '' if six.PY3 else 'u'}
class CaptureQueriesContext(object):
"""
Context manager that captures queries executed by the specified connection.
"""
def __init__(self, connection):
self.connection = connection
def __iter__(self):
return iter(self.captured_queries)
def __getitem__(self, index):
return self.captured_queries[index]
def __len__(self):
return len(self.captured_queries)
@property
def captured_queries(self):
return self.connection.queries[self.initial_queries:self.final_queries]
def __enter__(self):
self.force_debug_cursor = self.connection.force_debug_cursor
self.connection.force_debug_cursor = True
self.initial_queries = len(self.connection.queries_log)
self.final_queries = None
request_started.disconnect(reset_queries)
return self
def __exit__(self, exc_type, exc_value, traceback):
self.connection.force_debug_cursor = self.force_debug_cursor
request_started.connect(reset_queries)
if exc_type is not None:
return
self.final_queries = len(self.connection.queries_log)
class ignore_warnings(TestContextDecorator):
def __init__(self, **kwargs):
self.ignore_kwargs = kwargs
if 'message' in self.ignore_kwargs or 'module' in self.ignore_kwargs:
self.filter_func = warnings.filterwarnings
else:
self.filter_func = warnings.simplefilter
super(ignore_warnings, self).__init__()
def enable(self):
self.catch_warnings = warnings.catch_warnings()
self.catch_warnings.__enter__()
self.filter_func('ignore', **self.ignore_kwargs)
def disable(self):
self.catch_warnings.__exit__(*sys.exc_info())
@contextmanager
def patch_logger(logger_name, log_level, log_kwargs=False):
"""
Context manager that takes a named logger and the logging level
and provides a simple mock-like list of messages received
"""
calls = []
def replacement(msg, *args, **kwargs):
call = msg % args
calls.append((call, kwargs) if log_kwargs else call)
logger = logging.getLogger(logger_name)
orig = getattr(logger, log_level)
setattr(logger, log_level, replacement)
try:
yield calls
finally:
setattr(logger, log_level, orig)
# On OSes that don't provide tzset (Windows), we can't set the timezone
# in which the program runs. As a consequence, we must skip tests that
# don't enforce a specific timezone (with timezone.override or equivalent),
# or attempt to interpret naive datetimes in the default timezone.
requires_tz_support = skipUnless(
TZ_SUPPORT,
"This test relies on the ability to run a program in an arbitrary "
"time zone, but your operating system isn't able to do that."
)
@contextmanager
def extend_sys_path(*paths):
"""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