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