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250 lines
9.2 KiB
250 lines
9.2 KiB
# -*- 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: © 2010 by the Pallets team.
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:license: BSD, see LICENSE for more details.
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"""
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import werkzeug
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from contextlib import contextmanager
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from click.testing import CliRunner
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from flask.cli import ScriptInfo
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from werkzeug.test import Client, EnvironBuilder
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from flask import _request_ctx_stack
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from flask.json import dumps as json_dumps
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from werkzeug.urls import url_parse
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def make_test_environ_builder(
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app, path='/', base_url=None, subdomain=None, url_scheme=None,
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*args, **kwargs
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):
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"""Create a :class:`~werkzeug.test.EnvironBuilder`, taking some
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defaults from the application.
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:param app: The Flask application to configure the environment from.
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:param path: URL path being requested.
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:param base_url: Base URL where the app is being served, which
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``path`` is relative to. If not given, built from
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:data:`PREFERRED_URL_SCHEME`, ``subdomain``,
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:data:`SERVER_NAME`, and :data:`APPLICATION_ROOT`.
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:param subdomain: Subdomain name to append to :data:`SERVER_NAME`.
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:param url_scheme: Scheme to use instead of
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:data:`PREFERRED_URL_SCHEME`.
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:param json: If given, this is serialized as JSON and passed as
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``data``. Also defaults ``content_type`` to
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``application/json``.
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:param args: other positional arguments passed to
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:class:`~werkzeug.test.EnvironBuilder`.
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:param kwargs: other keyword arguments passed to
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:class:`~werkzeug.test.EnvironBuilder`.
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"""
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assert (
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not (base_url or subdomain or url_scheme)
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or (base_url is not None) != bool(subdomain or url_scheme)
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), 'Cannot pass "subdomain" or "url_scheme" with "base_url".'
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if base_url is None:
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http_host = app.config.get('SERVER_NAME') or 'localhost'
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app_root = app.config['APPLICATION_ROOT']
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if subdomain:
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http_host = '{0}.{1}'.format(subdomain, http_host)
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if url_scheme is None:
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url_scheme = app.config['PREFERRED_URL_SCHEME']
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url = url_parse(path)
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base_url = '{scheme}://{netloc}/{path}'.format(
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scheme=url.scheme or url_scheme,
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netloc=url.netloc or http_host,
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path=app_root.lstrip('/')
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)
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path = url.path
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if url.query:
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sep = b'?' if isinstance(url.query, bytes) else '?'
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path += sep + url.query
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if 'json' in kwargs:
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assert 'data' not in kwargs, (
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"Client cannot provide both 'json' and 'data'."
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)
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# push a context so flask.json can use app's json attributes
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with app.app_context():
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kwargs['data'] = json_dumps(kwargs.pop('json'))
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if 'content_type' not in kwargs:
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kwargs['content_type'] = 'application/json'
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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
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information about how to use this class refer to
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:class:`werkzeug.test.Client`.
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.. versionchanged:: 0.12
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`app.test_client()` includes preset default environment, which can be
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set after instantiation of the `app.test_client()` object in
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`client.environ_base`.
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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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def __init__(self, *args, **kwargs):
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super(FlaskClient, self).__init__(*args, **kwargs)
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self.environ_base = {
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"REMOTE_ADDR": "127.0.0.1",
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"HTTP_USER_AGENT": "werkzeug/" + werkzeug.__version__
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}
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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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::
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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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session_interface = app.session_interface
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sess = session_interface.open_session(app, 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 session_interface.is_null_session(sess):
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session_interface.save_session(app, 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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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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if (
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not kwargs and len(args) == 1
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and isinstance(args[0], (EnvironBuilder, dict))
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):
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environ = self.environ_base.copy()
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if isinstance(args[0], EnvironBuilder):
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environ.update(args[0].get_environ())
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else:
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environ.update(args[0])
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environ['flask._preserve_context'] = self.preserve_context
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else:
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kwargs.setdefault('environ_overrides', {}) \
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['flask._preserve_context'] = self.preserve_context
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kwargs.setdefault('environ_base', self.environ_base)
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builder = make_test_environ_builder(
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self.application, *args, **kwargs
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)
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try:
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environ = builder.get_environ()
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finally:
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builder.close()
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return Client.open(
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self, environ,
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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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)
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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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class FlaskCliRunner(CliRunner):
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"""A :class:`~click.testing.CliRunner` for testing a Flask app's
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CLI commands. Typically created using
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:meth:`~flask.Flask.test_cli_runner`. See :ref:`testing-cli`.
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"""
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def __init__(self, app, **kwargs):
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self.app = app
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super(FlaskCliRunner, self).__init__(**kwargs)
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def invoke(self, cli=None, args=None, **kwargs):
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"""Invokes a CLI command in an isolated environment. See
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:meth:`CliRunner.invoke <click.testing.CliRunner.invoke>` for
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full method documentation. See :ref:`testing-cli` for examples.
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If the ``obj`` argument is not given, passes an instance of
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:class:`~flask.cli.ScriptInfo` that knows how to load the Flask
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app being tested.
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:param cli: Command object to invoke. Default is the app's
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:attr:`~flask.app.Flask.cli` group.
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:param args: List of strings to invoke the command with.
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:return: a :class:`~click.testing.Result` object.
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"""
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if cli is None:
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cli = self.app.cli
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if 'obj' not in kwargs:
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kwargs['obj'] = ScriptInfo(create_app=lambda: self.app)
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return super(FlaskCliRunner, self).invoke(cli, args, **kwargs)
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