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A VCR imitation for python-requests

Project description

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.

Description: betamax

Betamax is a VCR_ imitation for requests. This will make mocking out requests
much easier. It is tested on `Travis CI`_.

Put in a more humorous way: "Betamax records your HTTP interactions so the NSA
does not have to."

Example Use

.. code-block:: python

from betamax import Betamax
from requests import Session
from unittest import TestCase

with Betamax.configure() as config:
config.cassette_library_dir = 'tests/fixtures/cassettes'

class TestGitHubAPI(TestCase):
def setUp(self):
self.session = Session()

# Set the cassette in a line other than the context declaration
def test_user(self):
with Betamax(self.session) as vcr:
resp = self.session.get('',
auth=('user', 'pass'))
assert resp.json()['login'] is not None

# Set the cassette in line with the context declaration
def test_repo(self):
with Betamax(self.session).use_cassette('repo'):
resp = self.session.get(
assert resp.json()['owner'] != {}

What does it even do?

If you are unfamiliar with VCR_, you might need a better explanation of what
Betamax does.

Betamax intercepts every request you make and attempts to find a matching
request that has already been intercepted and recorded. Two things can then

1. If there is a matching request, it will return the response that is
associated with it.
2. If there is **not** a matching request and it is allowed to record new
responses, it will make the request, record the response and return the

Recorded requests and corresponding responses - also known as interactions -
are stored in files called cassettes. (An example cassette can be seen in
the `examples section of the documentation`_.) The directory you store your
cassettes in is called your library, or your `cassette library`_.

VCR Cassette Compatibility

Betamax can use any VCR-recorded cassette as of this point in time. The only
caveat is that python-requests returns a URL on each response. VCR does not
store that in a cassette now but we will. Any VCR-recorded cassette used to
playback a response will unfortunately not have a URL attribute on responses
that are returned. This is a minor annoyance but not something that can be


You can check out the project board on waffle.io_ to see what the status of
each issue is.

.. _VCR:
.. _Travis CI:
.. _examples section of the documentation:
.. _cassette library:


0.5.1 - 2015-10-24

- Fix bugs with requests 2.8.x integration

- Fix bugs with older versions of requests that were missing an HTTPHeaderDict

0.5.0 - 2015-07-15

- Add unittest integration in ``betamax.fixtures.unittest``

- Add pytest integration in ``betamax.fixtures.pytest``

- Add a decorator as a short cut for ``use_cassette``

- Fix bug where body bytes were not always encoded on Python 3.2+

Fixed by @bboe

0.4.2 - 2015-04-18

- Fix issue #58 reported by @bboe

Multiple cookies were not being properly stored or replayed after being

- @leighlondon converted ``__all__`` to a tuple

0.4.1 - 2014-09-24

- Fix issue #39 reported by @buttscicles

This bug did not properly parse the Set-Cookie header with multiple cookies
when replaying a recorded response.

0.4.0 - 2014-07-29

- Allow the user to pass placeholders to ``Betamax#use_cassette``.

- Include Betamax's version number in cassettes

0.3.2 - 2014-06-05

- Fix request and response bodies courtesy of @dgouldin

0.3.1 - 2014-05-28

- Fix GitHub Issue #35 - Placeholders were not being properly applied to
request bodies. This release fixes that so placeholders are now behave as
expected with recorded request bodies.

0.3.0 - 2014-05-23

- Add ``Betamax#start`` and ``Betamax#stop`` to allow users to start recording
and stop without using a context-manager.

- Add ``digest-auth`` matcher to help users match the right request when using
requests' ``HTTPDigestAuth``.

- Reorganize and refactor the cassettes, matchers, and serializers modules.

- Refactor some portions of code a bit.

- ``Cassette.cassette_name`` no longer is the relative path to the file in
which the cassette is saved. To access that information use
``Cassette.cassette_path``. The ``cassette_name`` attribute is now the name
that you pass to ``Betamax#use_cassette``.

0.2.0 - 2014-04-12

- Fix bug where new interactions recorded under ``new_episodes`` or ``all``
were not actually saved to disk.

- Match URIs in a far more intelligent way.

- Use the Session's original adapters when making new requests

In the event the Session has a custom adapter mounted, e.g., the SSLAdapter
in requests-toolbelt, then we should probably use that.

- Add ``on_init`` hook to ``BaseMatcher`` so matcher authors can customize

- Add support for custom Serialization formats. See the docs for more info.

- Add support for preserving exact body bytes.

- Deprecate ``serialize`` keyword to ``Betamax#use_cassette`` in preference
for ``serialize_with`` (to be more similar to VCR).

0.1.6 - 2013-12-07

- Fix how global settings and per-invocation options are persisted and
honored. (#10)

- Support ``match_requests_on`` as a parameter sent to
``Betamax#use_cassette``. (No issue)

0.1.5 - 2013-09-27

- Make sure what we pass to ``base64.b64decode`` is a bytes object

0.1.4 - 2013-09-27

- Do not try to sanitize something that may not exist.

0.1.3 - 2013-09-27

- Fix issue when response has a Content-Encoding of gzip and we need to
preserve the original bytes of the message.

0.1.2 - 2013-09-21

- Fix issues with how requests parses cookies out of responses

- Fix unicode issues with ``Response#text`` (trying to use ``Response#json``
raises exception because it cannot use string decoding on a unicode string)

0.1.1 - 2013-09-19

- Fix issue where there is a unicode character not in ``range(128)``

0.1.0 - 2013-09-17

- Initial Release

- Support for VCR generated cassettes (JSON only)

- Support for ``re_record_interval``

- Support for the ``once``, ``all``, ``new_episodes``, ``all`` cassette modes

- Support for filtering sensitive data

- Support for the following methods of request matching:

- Method


- Host

- Path

- Query String

- Body

- Headers

Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: License :: OSI Approved
Classifier: Intended Audience :: Developers
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.2
Classifier: Programming Language :: Python :: 3.3
Classifier: Programming Language :: Python :: Implementation :: CPython

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