284 lines
9.9 KiB
Python
284 lines
9.9 KiB
Python
# -*- 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 Pallets
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:license: BSD-3-Clause
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"""
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import warnings
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from contextlib import contextmanager
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import werkzeug.test
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from click.testing import CliRunner
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from werkzeug.test import Client
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from werkzeug.urls import url_parse
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from . import _request_ctx_stack
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from .cli import ScriptInfo
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from .json import dumps as json_dumps
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class EnvironBuilder(werkzeug.test.EnvironBuilder):
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"""An :class:`~werkzeug.test.EnvironBuilder`, that takes defaults from the
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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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def __init__(
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self,
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app,
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path="/",
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base_url=None,
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subdomain=None,
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url_scheme=None,
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*args,
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**kwargs
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):
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assert not (base_url or subdomain or url_scheme) or (
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base_url is not None
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) != bool(
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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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self.app = app
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super(EnvironBuilder, self).__init__(path, base_url, *args, **kwargs)
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def json_dumps(self, obj, **kwargs):
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"""Serialize ``obj`` to a JSON-formatted string.
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The serialization will be configured according to the config associated
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with this EnvironBuilder's ``app``.
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"""
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kwargs.setdefault("app", self.app)
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return json_dumps(obj, **kwargs)
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def make_test_environ_builder(*args, **kwargs):
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"""Create a :class:`flask.testing.EnvironBuilder`.
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.. deprecated: 1.1
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Will be removed in 2.0. Construct
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``flask.testing.EnvironBuilder`` directly instead.
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"""
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warnings.warn(
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DeprecationWarning(
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'"make_test_environ_builder()" is deprecated and will be'
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' removed in 2.0. Construct "flask.testing.EnvironBuilder"'
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" directly instead."
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)
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)
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return EnvironBuilder(*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(
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"Session transactions only make sense with cookies enabled."
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)
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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(
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"Session backend did not open a session. Check the configuration"
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)
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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
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and len(args) == 1
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and isinstance(args[0], (werkzeug.test.EnvironBuilder, dict))
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):
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environ = self.environ_base.copy()
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if isinstance(args[0], werkzeug.test.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"
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] = self.preserve_context
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kwargs.setdefault("environ_base", self.environ_base)
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builder = EnvironBuilder(self.application, *args, **kwargs)
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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,
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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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# Normally the request context is preserved until the next
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# request in the same thread comes. When the client exits we
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# want to clean up earlier. Pop request contexts until the stack
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# is empty or a non-preserved one is found.
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while True:
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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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else:
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break
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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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