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# -*- coding: utf-8 -*-
"""
flask.testing
~~~~~~~~~~~~~
Implements test support helpers. This module is lazily imported
and usually not used in production environments.
:copyright: (c) 2011 by Armin Ronacher.
:license: BSD, see LICENSE for more details.
"""
from __future__ import with_statement
from contextlib import contextmanager
from werkzeug.test import Client, EnvironBuilder
from flask import _request_ctx_stack
def make_test_environ_builder(app, path='/', base_url=None, *args, **kwargs):
"""Creates a new test builder with some application defaults thrown in."""
http_host = app.config.get('SERVER_NAME')
app_root = app.config.get('APPLICATION_ROOT')
if base_url is None:
base_url = 'http://%s/' % (http_host or 'localhost')
if app_root:
base_url += app_root.lstrip('/')
return EnvironBuilder(path, base_url, *args, **kwargs)
class FlaskClient(Client):
"""Works like a regular Werkzeug test client but has some knowledge about
how Flask works to defer the cleanup of the request context stack to the
end of a with body when used in a with statement. For general information
about how to use this class refer to :class:`werkzeug.test.Client`.
Basic usage is outlined in the :ref:`testing` chapter.
"""
preserve_context = False
@contextmanager
def session_transaction(self, *args, **kwargs):
"""When used in combination with a with statement this opens a
session transaction. This can be used to modify the session that
the test client uses. Once the with block is left the session is
stored back.
with client.session_transaction() as session:
session['value'] = 42
Internally this is implemented by going through a temporary test
request context and since session handling could depend on
request variables this function accepts the same arguments as
:meth:`~flask.Flask.test_request_context` which are directly
passed through.
"""
if self.cookie_jar is None:
raise RuntimeError('Session transactions only make sense '
'with cookies enabled.')
app = self.application
environ_overrides = kwargs.setdefault('environ_overrides', {})
self.cookie_jar.inject_wsgi(environ_overrides)
outer_reqctx = _request_ctx_stack.top
with app.test_request_context(*args, **kwargs) as c:
sess = app.open_session(c.request)
if sess is None:
raise RuntimeError('Session backend did not open a session. '
'Check the configuration')
# Since we have to open a new request context for the session
# handling we want to make sure that we hide out own context
# from the caller. By pushing the original request context
# (or None) on top of this and popping it we get exactly that
# behavior. It's important to not use the push and pop
# methods of the actual request context object since that would
# mean that cleanup handlers are called
_request_ctx_stack.push(outer_reqctx)
try:
yield sess
finally:
_request_ctx_stack.pop()
resp = app.response_class()
if not app.session_interface.is_null_session(sess):
app.save_session(sess, resp)
headers = resp.get_wsgi_headers(c.request.environ)
self.cookie_jar.extract_wsgi(c.request.environ, headers)
def open(self, *args, **kwargs):
kwargs.setdefault('environ_overrides', {}) \
['flask._preserve_context'] = self.preserve_context
as_tuple = kwargs.pop('as_tuple', False)
buffered = kwargs.pop('buffered', False)
follow_redirects = kwargs.pop('follow_redirects', False)
builder = make_test_environ_builder(self.application, *args, **kwargs)
return Client.open(self, builder,
as_tuple=as_tuple,
buffered=buffered,
follow_redirects=follow_redirects)
def __enter__(self):
if self.preserve_context:
raise RuntimeError('Cannot nest client invocations')
self.preserve_context = True
return self
def __exit__(self, exc_type, exc_value, tb):
self.preserve_context = False
# on exit we want to clean up earlier. Normally the request context
# stays preserved until the next request in the same thread comes
# in. See RequestGlobals.push() for the general behavior.
top = _request_ctx_stack.top
if top is not None and top.preserved:
top.pop()
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