bump version to v5.0.0

Drop support for Python 3.7 (after 2023-06-27)

.github/workflows/codespell.yml

@@ -0,0 +1,22 @@
+---
+name: Codespell
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Codespell
+        uses: codespell-project/actions-codespell@v2

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "pypy-3.8"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "pypy-3.8"]
 
     steps:
       - uses: actions/checkout@v3.5.2
@@ -25,11 +25,19 @@ jobs:
 
       - name: Install project dependencies
         run: |
-          pip install --upgrade pip
-          pip install codecov tox tox-gh-actions
+          pip3 install --upgrade pip
+          pip3 install codecov tox tox-gh-actions
 
-      - name: Run tests with tox
-        run: tox
+      - name: Run online tests with tox
+        run: tox -- -m online
+
+      - name: Run offline tests with tox with no access to the Internet
+        run: |
+          # We're using unshare to take Internet access
+          # away from tox so that we'll notice whenever some new test
+          # is missing @pytest.mark.online decoration in the future
+          unshare --map-root-user --net -- \
+              sh -c 'ip link set lo up; tox -- -m "not online"'
 
       - name: Run coverage
         run: codecov

docs/advanced.rst

@@ -71,7 +71,7 @@ Finally, register your class with VCR to use your new serializer.
 
     import vcr
 
-    class BogoSerializer(object):
+    class BogoSerializer:
         """
         Must implement serialize() and deserialize() methods
         """
@@ -136,7 +136,8 @@ Create your own persistence class, see the example below:
 
 Your custom persister must implement both ``load_cassette`` and ``save_cassette``
 methods.  The ``load_cassette`` method must return a deserialized cassette or raise
-``ValueError`` if no cassette is found.
+either ``CassetteNotFoundError`` if no cassette is found, or ``CassetteDecodeError``
+if the cassette cannot be successfully deserialized.
 
 Once the persister class is defined, register with VCR like so...
 

docs/changelog.rst

@@ -7,6 +7,20 @@ For a full list of triaged issues, bugs and PRs and what release they are target
 
 All help in providing PRs to close out bug issues is appreciated. Even if that is providing a repo that fully replicates issues. We have very generous contributors that have added these to bug issues which meant another contributor picked up the bug and closed it out.
 
+-  5.0.0
+    - BREAKING CHANGE: Drop support for Python 3.7.  3.7 is EOL as of 6/27/23 Thanks @jairhenrique
+    - BREAKING CHANGE: Custom Cassette persisters no longer catch ValueError.  If you have implemented a custom persister (has anyone implemented a custom persister?  Let us know!) then you will need to throw a CassetteNotFoundError when unable to find a cassette.  See #681 for discussion and reason for this change. Thanks @amosjyng for the PR and the review from @hartwork
+-  4.4.0
+    - HUGE thanks to @hartwork for all the work done on this release!
+    - Bring vcr/unittest in to vcrpy as a full feature of vcr instead of a separate library.  Big thanks to @hartwork for doing this and to @agriffis for originally creating the library
+    - Make decompression robust towards already decompressed input (thanks @hartwork)
+    - Bugfix: Add read1 method (fixes compatibility with biopython), thanks @mghantous
+    - Bugfix: Prevent filters from corrupting request (thanks @abramclark)
+    - Bugfix: Add support for `response.raw.stream()` to fix urllib v2 compat
+    - Bugfix: Replace `assert` with `raise AssertionError`: fixes support for `PYTHONOPTIMIZE=1`
+    - Add pytest.mark.online to run test suite offline, thanks @jspricke
+    - use python3 and pip3 binaries to ease debian packaging (thanks @hartwork)
+    - Add codespell (thanks @mghantous)
 -  4.3.1
     - Support urllib3 v1 and v2.  NOTE: there is an issue running urllib3 v2 on
       Python older than 3.10, so this is currently blocked in the requirements.

docs/conf.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # vcrpy documentation build configuration file, created by
 # sphinx-quickstart on Sun Sep 13 11:18:00 2015.

docs/contributing.rst

@@ -74,7 +74,7 @@ The PR reviewer is a second set of eyes to see if:
 **Release Manager:**
  - Ensure CI is passing.
  - Create a release on github and tag it with the changelog release notes.
- - ``python setup.py build sdist bdist_wheel``
+ - ``python3 setup.py build sdist bdist_wheel``
  - ``twine upload dist/*``
  - Go to ReadTheDocs build page and trigger a build https://readthedocs.org/projects/vcrpy/builds/
 
@@ -96,11 +96,11 @@ The test suite is pretty big and slow, but you can tell tox to only run specific
 
     tox -e {pyNN}-{HTTP_LIBRARY} -- <pytest flags passed through>
 
-    tox -e py37-requests -- -v -k "'test_status_code or test_gzip'"
-    tox -e py37-requests -- -v --last-failed
+    tox -e py38-requests -- -v -k "'test_status_code or test_gzip'"
+    tox -e py38-requests -- -v --last-failed
 
 This will run only tests that look like ``test_status_code`` or
-``test_gzip`` in the test suite, and only in the python 3.7 environment
+``test_gzip`` in the test suite, and only in the python 3.8 environment
 that has ``requests`` installed.
 
 Also, in order for the boto tests to run, you will need an AWS key.
@@ -127,20 +127,20 @@ in this example::
     eval "$(pyenv init -)"
 
     # Setup your local system tox tooling
-    pip install tox tox-pyenv
+    pip3 install tox tox-pyenv
 
     # Install supported versions (at time of writing), this does not activate them
-    pyenv install 3.7.5 3.8.0 pypy3.8
+    pyenv install 3.8.0 pypy3.8
 
     # This activates them
-    pyenv local 3.7.5 3.8.0 pypy3.8
+    pyenv local 3.8.0 pypy3.8
 
     # Run the whole test suite
     tox
 
     # Run the whole test suite or just part of it
     tox -e lint
-    tox -e py37-requests
+    tox -e py38-requests
 
 
 Troubleshooting on MacOSX

docs/installation.rst

@@ -4,12 +4,12 @@ Installation
 VCR.py is a package on `PyPI <https://pypi.python.org>`__, so you can install
 with pip::
 
-    pip install vcrpy
+    pip3 install vcrpy
 
 Compatibility
 -------------
 
-VCR.py supports Python 3.7+, and `pypy <http://pypy.org>`__.
+VCR.py supports Python 3.8+, and `pypy <http://pypy.org>`__.
 
 The following HTTP libraries are supported:
 
@@ -35,7 +35,7 @@ rebuilding pyyaml.
 
 1. Test if pyyaml is built with libyaml. This should work::
 
-     python -c 'from yaml import CLoader'
+     python3 -c 'from yaml import CLoader'
 
 2. Install libyaml according to your Linux distribution, or using `Homebrew
    <http://mxcl.github.com/homebrew/>`__ on Mac::
@@ -46,8 +46,8 @@ rebuilding pyyaml.
 
 3. Rebuild pyyaml with libyaml::
 
-     pip uninstall pyyaml
-     pip --no-cache-dir install pyyaml
+     pip3 uninstall pyyaml
+     pip3 --no-cache-dir install pyyaml
 
 Upgrade
 -------
@@ -61,7 +61,7 @@ is to simply delete your cassettes and re-record all of them. VCR.py
 also provides a migration script that attempts to upgrade your 0.x
 cassettes to the new 1.x format. To use it, run the following command::
 
-    python -m vcr.migration PATH
+    python3 -m vcr.migration PATH
 
 The PATH can be either a path to the directory with cassettes or the
 path to a single cassette.

docs/usage.rst

@@ -4,11 +4,11 @@ Usage
 .. code:: python
 
     import vcr
-    import urllib
+    import urllib.request
 
     with vcr.use_cassette('fixtures/vcr_cassettes/synopsis.yaml'):
         response = urllib.request.urlopen('http://www.iana.org/domains/reserved').read()
-        assert 'Example domains' in response
+        assert b'Example domains' in response
 
 Run this test once, and VCR.py will record the HTTP request to
 ``fixtures/vcr_cassettes/synopsis.yaml``. Run it again, and VCR.py will
@@ -26,7 +26,7 @@ look like this:
     @vcr.use_cassette('fixtures/vcr_cassettes/synopsis.yaml')
     def test_iana():
         response = urllib.request.urlopen('http://www.iana.org/domains/reserved').read()
-        assert 'Example domains' in response
+        assert b'Example domains' in response
 
 When using the decorator version of ``use_cassette``, it is possible to
 omit the path to the cassette file.
@@ -36,7 +36,7 @@ omit the path to the cassette file.
     @vcr.use_cassette()
     def test_iana():
         response = urllib.request.urlopen('http://www.iana.org/domains/reserved').read()
-        assert 'Example domains' in response
+        assert b'Example domains' in response
 
 In this case, the cassette file will be given the same name as the test
 function, and it will be placed in the same directory as the file in
@@ -92,9 +92,73 @@ all
 Unittest Integration
 --------------------
 
-While it's possible to use the context manager or decorator forms with unittest,
-there's also a ``VCRTestCase`` provided separately by `vcrpy-unittest
-<https://github.com/agriffis/vcrpy-unittest>`__.
+Inherit from ``VCRTestCase`` for automatic recording and playback of HTTP
+interactions.
+
+.. code:: python
+
+    from vcr.unittest import VCRTestCase
+    import requests
+
+    class MyTestCase(VCRTestCase):
+       def test_something(self):
+           response = requests.get('http://example.com')
+
+Similar to how VCR.py returns the cassette from the context manager,
+``VCRTestCase`` makes the cassette available as ``self.cassette``:
+
+.. code:: python
+
+    self.assertEqual(len(self.cassette), 1)
+    self.assertEqual(self.cassette.requests[0].uri, 'http://example.com')
+
+By default cassettes will be placed in the ``cassettes`` subdirectory next to the
+test, named according to the test class and method. For example, the above test
+would read from and write to ``cassettes/MyTestCase.test_something.yaml``
+
+The configuration can be modified by overriding methods on your subclass:
+``_get_vcr_kwargs``, ``_get_cassette_library_dir`` and ``_get_cassette_name``.
+To modify the ``VCR`` object after instantiation, for example to add a matcher,
+you can hook on ``_get_vcr``, for example:
+
+.. code:: python
+
+    class MyTestCase(VCRTestCase):
+        def _get_vcr(self, **kwargs):
+            myvcr = super(MyTestCase, self)._get_vcr(**kwargs)
+            myvcr.register_matcher('mymatcher', mymatcher)
+            myvcr.match_on = ['mymatcher']
+            return myvcr
+
+See
+`the source
+<https://github.com/kevin1024/vcrpy/blob/master/vcr/unittest.py>`__
+for the default implementations of these methods.
+
+If you implement a ``setUp`` method on your test class then make sure to call
+the parent version ``super().setUp()`` in your own in order to continue getting
+the cassettes produced.
+
+VCRMixin
+~~~~~~~~
+
+In case inheriting from ``VCRTestCase`` is difficult because of an existing
+class hierarchy containing tests in the base classes, inherit from ``VCRMixin``
+instead.
+
+.. code:: python
+
+    from vcr.unittest import VCRMixin
+    import requests
+    import unittest
+
+    class MyTestMixin(VCRMixin):
+       def test_something(self):
+           response = requests.get(self.url)
+
+    class MyTestCase(MyTestMixin, unittest.TestCase):
+        url = 'http://example.com'
+
 
 Pytest Integration
 ------------------

pyproject.toml

@@ -7,3 +7,14 @@ known_first_party = "vcrpy"
 multi_line_output = 3
 use_parentheses = true
 include_trailing_comma = true
+
+[tool.codespell]
+skip = '.git,*.pdf,*.svg,.tox'
+ignore-regex = "\\\\[fnrstv]"
+#
+# ignore-words-list = ''
+
+[tool.pytest.ini_options]
+markers = [
+    "online",
+]

runtests.sh

@@ -4,4 +4,4 @@
 # If you are getting an INVOCATION ERROR for this script then there is 
 # a good chance you are running on Windows.
 # You can and should use WSL for running tox on Windows when it calls bash scripts.
-REQUESTS_CA_BUNDLE=`python -m pytest_httpbin.certs` pytest $*
+REQUESTS_CA_BUNDLE=`python3 -m pytest_httpbin.certs` exec pytest "$@"

setup.py

@@ -8,7 +8,7 @@ import sys
 from setuptools import find_packages, setup
 from setuptools.command.test import test as TestCommand
 
-long_description = open("README.rst", "r").read()
+long_description = open("README.rst").read()
 here = os.path.abspath(os.path.dirname(__file__))
 
 
@@ -85,7 +85,7 @@ setup(
     author_email="me@kevinmccarthy.org",
     url="https://github.com/kevin1024/vcrpy",
     packages=find_packages(exclude=["tests*"]),
-    python_requires=">=3.7",
+    python_requires=">=3.8",
     install_requires=install_requires,
     license="MIT",
     tests_require=tests_require,
@@ -95,7 +95,6 @@ setup(
         "Intended Audience :: Developers",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",

tests/assertions.py

@@ -11,9 +11,10 @@ def assert_cassette_has_one_response(cass):
     assert cass.play_count == 1
 
 
-def assert_is_json(a_string):
+def assert_is_json_bytes(b: bytes):
+    assert isinstance(b, bytes)
     try:
-        json.loads(a_string.decode("utf-8"))
+        json.loads(b.decode("utf-8"))
     except Exception:
         assert False
     assert True

tests/integration/test_aiohttp.py

@@ -34,6 +34,7 @@ def post(url, output="text", **kwargs):
     return request("POST", url, output="text", **kwargs)
 
 
+@pytest.mark.online
 def test_status(tmpdir, mockbin_request_url):
     url = mockbin_request_url
 
@@ -46,6 +47,7 @@ def test_status(tmpdir, mockbin_request_url):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 @pytest.mark.parametrize("auth", [None, aiohttp.BasicAuth("vcrpy", "test")])
 def test_headers(tmpdir, auth, mockbin_request_url):
     url = mockbin_request_url
@@ -63,6 +65,7 @@ def test_headers(tmpdir, auth, mockbin_request_url):
         assert "yarl.URL" not in cassette.data[0]
 
 
+@pytest.mark.online
 def test_case_insensitive_headers(tmpdir, mockbin_request_url):
     url = mockbin_request_url
 
@@ -76,6 +79,7 @@ def test_case_insensitive_headers(tmpdir, mockbin_request_url):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_text(tmpdir, mockbin_request_url):
     url = mockbin_request_url
 
@@ -88,6 +92,7 @@ def test_text(tmpdir, mockbin_request_url):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_json(tmpdir, mockbin_request_url):
     url = mockbin_request_url
     headers = {"Content-Type": "application/json"}
@@ -101,6 +106,7 @@ def test_json(tmpdir, mockbin_request_url):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_binary(tmpdir, mockbin_request_url):
     url = mockbin_request_url + "/image/png"
     with vcr.use_cassette(str(tmpdir.join("binary.yaml"))):
@@ -112,6 +118,7 @@ def test_binary(tmpdir, mockbin_request_url):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_stream(tmpdir, mockbin_request_url):
     url = mockbin_request_url
 
@@ -124,6 +131,7 @@ def test_stream(tmpdir, mockbin_request_url):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 @pytest.mark.parametrize("body", ["data", "json"])
 def test_post(tmpdir, body, caplog, mockbin_request_url):
     caplog.set_level(logging.INFO)
@@ -143,12 +151,13 @@ def test_post(tmpdir, body, caplog, mockbin_request_url):
         (
             log
             for log in caplog.records
-            if log.getMessage() == "<Request (POST) {}> not in cassette, sending to real server".format(url)
+            if log.getMessage() == f"<Request (POST) {url}> not in cassette, sending to real server"
         ),
         None,
     ), "Log message not found."
 
 
+@pytest.mark.online
 def test_params(tmpdir, mockbin_request_url):
     url = mockbin_request_url + "?d=d"
     headers = {"Content-Type": "application/json"}
@@ -164,6 +173,7 @@ def test_params(tmpdir, mockbin_request_url):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_params_same_url_distinct_params(tmpdir, mockbin_request_url):
     url = mockbin_request_url
     headers = {"Content-Type": "application/json"}
@@ -183,6 +193,7 @@ def test_params_same_url_distinct_params(tmpdir, mockbin_request_url):
             get(url, output="text", params=other_params)
 
 
+@pytest.mark.online
 def test_params_on_url(tmpdir, mockbin_request_url):
     url = mockbin_request_url + "?a=1&b=foo"
     headers = {"Content-Type": "application/json"}
@@ -248,6 +259,7 @@ def test_aiohttp_test_client_json(aiohttp_client, tmpdir):
     assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_redirect(tmpdir, mockbin):
     url = mockbin + "/redirect/302/2"
 
@@ -272,6 +284,7 @@ def test_redirect(tmpdir, mockbin):
     assert cassette_response.request_info.real_url == response.request_info.real_url
 
 
+@pytest.mark.online
 def test_not_modified(tmpdir, mockbin):
     """It doesn't try to redirect on 304"""
     url = mockbin + "/status/304"
@@ -289,6 +302,7 @@ def test_not_modified(tmpdir, mockbin):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_double_requests(tmpdir, mockbin_request_url):
     """We should capture, record, and replay all requests and response chains,
     even if there are duplicate ones.
@@ -404,6 +418,7 @@ def test_cookies_redirect(httpbin_both, httpbin_ssl_context, tmpdir):
     run_in_loop(run)
 
 
+@pytest.mark.online
 def test_not_allow_redirects(tmpdir, mockbin):
     url = mockbin + "/redirect/308/5"
     path = str(tmpdir.join("redirects.yaml"))

tests/integration/test_basic.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """Basic tests for cassettes"""
 
 # External imports

tests/integration/test_boto3.py

@@ -20,12 +20,12 @@ except ImportError:
 # https://github.com/boto/botocore/pull/1495
 boto3_skip_vendored_requests = pytest.mark.skipif(
     botocore_awsrequest,
-    reason="botocore version {ver} does not use vendored requests anymore.".format(ver=botocore.__version__),
+    reason=f"botocore version {botocore.__version__} does not use vendored requests anymore.",
 )
 
 boto3_skip_awsrequest = pytest.mark.skipif(
     not botocore_awsrequest,
-    reason="botocore version {ver} still uses vendored requests.".format(ver=botocore.__version__),
+    reason=f"botocore version {botocore.__version__} still uses vendored requests.",
 )
 
 IAM_USER_NAME = "vcrpy"

tests/integration/test_config.py

@@ -7,6 +7,7 @@ import pytest
 import vcr
 
 
+@pytest.mark.online
 def test_set_serializer_default_config(tmpdir, mockbin_request_url):
     my_vcr = vcr.VCR(serializer="json")
 
@@ -20,6 +21,7 @@ def test_set_serializer_default_config(tmpdir, mockbin_request_url):
         assert json.loads(file_content)
 
 
+@pytest.mark.online
 def test_default_set_cassette_library_dir(tmpdir, mockbin_request_url):
     my_vcr = vcr.VCR(cassette_library_dir=str(tmpdir.join("subdir")))
 
@@ -29,6 +31,7 @@ def test_default_set_cassette_library_dir(tmpdir, mockbin_request_url):
     assert os.path.exists(str(tmpdir.join("subdir").join("test.json")))
 
 
+@pytest.mark.online
 def test_override_set_cassette_library_dir(tmpdir, mockbin_request_url):
     my_vcr = vcr.VCR(cassette_library_dir=str(tmpdir.join("subdir")))
 
@@ -41,6 +44,7 @@ def test_override_set_cassette_library_dir(tmpdir, mockbin_request_url):
     assert not os.path.exists(str(tmpdir.join("subdir").join("test.json")))
 
 
+@pytest.mark.online
 def test_override_match_on(tmpdir, mockbin_request_url):
     my_vcr = vcr.VCR(match_on=["method"])
 
@@ -62,6 +66,7 @@ def test_missing_matcher():
             pass
 
 
+@pytest.mark.online
 def test_dont_record_on_exception(tmpdir, mockbin_request_url):
     my_vcr = vcr.VCR(record_on_exception=False)
 

tests/integration/test_disksaver.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """Basic tests about save behavior"""
 
 # External imports
@@ -6,10 +5,13 @@ import os
 import time
 from urllib.request import urlopen
 
+import pytest
+
 # Internal imports
 import vcr
 
 
+@pytest.mark.online
 def test_disk_saver_nowrite(tmpdir, mockbin_request_url):
     """
     Ensure that when you close a cassette without changing it it doesn't
@@ -30,6 +32,7 @@ def test_disk_saver_nowrite(tmpdir, mockbin_request_url):
     assert last_mod == last_mod2
 
 
+@pytest.mark.online
 def test_disk_saver_write(tmpdir, mockbin_request_url):
     """
     Ensure that when you close a cassette after changing it it does

tests/integration/test_filter.py

@@ -5,7 +5,7 @@ from urllib.parse import urlencode
 from urllib.request import Request, urlopen
 
 import pytest
-from assertions import assert_cassette_has_one_response, assert_is_json
+from assertions import assert_cassette_has_one_response, assert_is_json_bytes
 
 import vcr
 
@@ -105,7 +105,7 @@ def test_decompress_gzip(tmpdir, httpbin):
     with vcr.use_cassette(cass_file) as cass:
         decoded_response = urlopen(url).read()
         assert_cassette_has_one_response(cass)
-    assert_is_json(decoded_response)
+    assert_is_json_bytes(decoded_response)
 
 
 def test_decomptess_empty_body(tmpdir, httpbin):
@@ -129,7 +129,7 @@ def test_decompress_deflate(tmpdir, httpbin):
     with vcr.use_cassette(cass_file) as cass:
         decoded_response = urlopen(url).read()
         assert_cassette_has_one_response(cass)
-    assert_is_json(decoded_response)
+    assert_is_json_bytes(decoded_response)
 
 
 def test_decompress_regular(tmpdir, httpbin):
@@ -141,4 +141,25 @@ def test_decompress_regular(tmpdir, httpbin):
     with vcr.use_cassette(cass_file) as cass:
         resp = urlopen(url).read()
         assert_cassette_has_one_response(cass)
-    assert_is_json(resp)
+    assert_is_json_bytes(resp)
+
+
+def test_before_record_request_corruption(tmpdir, httpbin):
+    """Modifying request in before_record_request should not affect outgoing request"""
+
+    def before_record(request):
+        request.headers.clear()
+        request.body = b""
+        return request
+
+    req = Request(
+        httpbin.url + "/post",
+        data=urlencode({"test": "exists"}).encode(),
+        headers={"X-Test": "exists"},
+    )
+    cass_file = str(tmpdir.join("modified_response.yaml"))
+    with vcr.use_cassette(cass_file, before_record_request=before_record):
+        resp = json.loads(urlopen(req).read())
+
+    assert resp["headers"]["X-Test"] == "exists"
+    assert resp["form"]["test"] == "exists"

tests/integration/test_httplib2.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """Integration tests with httplib2"""
 from urllib.parse import urlencode
 
@@ -56,6 +55,7 @@ def test_response_headers(tmpdir, httpbin_both):
         assert set(headers) == set(resp.items())
 
 
+@pytest.mark.online
 def test_effective_url(tmpdir):
     """Ensure that the effective_url is captured"""
     url = "http://mockbin.org/redirect/301"

tests/integration/test_httpx.py

@@ -87,6 +87,7 @@ def yml(tmpdir, request):
     return str(tmpdir.join(request.function.__name__ + ".yaml"))
 
 
+@pytest.mark.online
 def test_status(tmpdir, mockbin, do_request):
     url = mockbin
 
@@ -99,6 +100,7 @@ def test_status(tmpdir, mockbin, do_request):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_case_insensitive_headers(tmpdir, mockbin, do_request):
     url = mockbin
 
@@ -112,6 +114,7 @@ def test_case_insensitive_headers(tmpdir, mockbin, do_request):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_content(tmpdir, mockbin, do_request):
     url = mockbin
 
@@ -124,6 +127,7 @@ def test_content(tmpdir, mockbin, do_request):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_json(tmpdir, mockbin, do_request):
     url = mockbin + "/request"
 
@@ -138,6 +142,7 @@ def test_json(tmpdir, mockbin, do_request):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 def test_params_same_url_distinct_params(tmpdir, mockbin, do_request):
     url = mockbin + "/request"
     headers = {"Content-Type": "application/json"}
@@ -158,6 +163,7 @@ def test_params_same_url_distinct_params(tmpdir, mockbin, do_request):
             do_request()("GET", url, params=params, headers=headers)
 
 
+@pytest.mark.online
 def test_redirect(mockbin, yml, do_request):
     url = mockbin + "/redirect/303/2"
 
@@ -184,6 +190,7 @@ def test_redirect(mockbin, yml, do_request):
     }
 
 
+@pytest.mark.online
 def test_work_with_gzipped_data(mockbin, do_request, yml):
     url = mockbin + "/gzip?foo=bar"
     headers = {"accept-encoding": "deflate, gzip"}
@@ -199,6 +206,7 @@ def test_work_with_gzipped_data(mockbin, do_request, yml):
         assert cassette.play_count == 1
 
 
+@pytest.mark.online
 @pytest.mark.parametrize("url", ["https://github.com/kevin1024/vcrpy/issues/" + str(i) for i in range(3, 6)])
 def test_simple_fetching(do_request, yml, url):
     with vcr.use_cassette(yml):
@@ -231,6 +239,7 @@ def test_behind_proxy(do_request):
         assert cassette_response.request.url == response.request.url
 
 
+@pytest.mark.online
 def test_cookies(tmpdir, mockbin, do_request):
     def client_cookies(client):
         return [c for c in client.client.cookies]
@@ -268,6 +277,7 @@ def test_cookies(tmpdir, mockbin, do_request):
             assert client_cookies(new_client) == ["k1", "k2"]
 
 
+@pytest.mark.online
 def test_relative_redirects(tmpdir, scheme, do_request, mockbin):
     redirect_kwargs = {HTTPX_REDIRECT_PARAM.name: True}
 
@@ -286,6 +296,7 @@ def test_relative_redirects(tmpdir, scheme, do_request, mockbin):
         assert cassette.play_count == 3
 
 
+@pytest.mark.online
 def test_redirect_wo_allow_redirects(do_request, mockbin, yml):
     url = mockbin + "/redirect/308/5"
 

tests/integration/test_ignore.py

@@ -28,9 +28,9 @@ def test_ignore_localhost(tmpdir, httpbin):
     with overridden_dns({"httpbin.org": "127.0.0.1"}):
         cass_file = str(tmpdir.join("filter_qs.yaml"))
         with vcr.use_cassette(cass_file, ignore_localhost=True) as cass:
-            urlopen("http://localhost:{}/".format(httpbin.port))
+            urlopen(f"http://localhost:{httpbin.port}/")
             assert len(cass) == 0
-            urlopen("http://httpbin.org:{}/".format(httpbin.port))
+            urlopen(f"http://httpbin.org:{httpbin.port}/")
             assert len(cass) == 1
 
 
@@ -38,9 +38,9 @@ def test_ignore_httpbin(tmpdir, httpbin):
     with overridden_dns({"httpbin.org": "127.0.0.1"}):
         cass_file = str(tmpdir.join("filter_qs.yaml"))
         with vcr.use_cassette(cass_file, ignore_hosts=["httpbin.org"]) as cass:
-            urlopen("http://httpbin.org:{}/".format(httpbin.port))
+            urlopen(f"http://httpbin.org:{httpbin.port}/")
             assert len(cass) == 0
-            urlopen("http://localhost:{}/".format(httpbin.port))
+            urlopen(f"http://localhost:{httpbin.port}/")
             assert len(cass) == 1
 
 
@@ -48,8 +48,8 @@ def test_ignore_localhost_and_httpbin(tmpdir, httpbin):
     with overridden_dns({"httpbin.org": "127.0.0.1"}):
         cass_file = str(tmpdir.join("filter_qs.yaml"))
         with vcr.use_cassette(cass_file, ignore_hosts=["httpbin.org"], ignore_localhost=True) as cass:
-            urlopen("http://httpbin.org:{}".format(httpbin.port))
-            urlopen("http://localhost:{}".format(httpbin.port))
+            urlopen(f"http://httpbin.org:{httpbin.port}")
+            urlopen(f"http://localhost:{httpbin.port}")
             assert len(cass) == 0
 
 
@@ -57,12 +57,12 @@ def test_ignore_localhost_twice(tmpdir, httpbin):
     with overridden_dns({"httpbin.org": "127.0.0.1"}):
         cass_file = str(tmpdir.join("filter_qs.yaml"))
         with vcr.use_cassette(cass_file, ignore_localhost=True) as cass:
-            urlopen("http://localhost:{}".format(httpbin.port))
+            urlopen(f"http://localhost:{httpbin.port}")
             assert len(cass) == 0
-            urlopen("http://httpbin.org:{}".format(httpbin.port))
+            urlopen(f"http://httpbin.org:{httpbin.port}")
             assert len(cass) == 1
         with vcr.use_cassette(cass_file, ignore_localhost=True) as cass:
             assert len(cass) == 1
-            urlopen("http://localhost:{}".format(httpbin.port))
-            urlopen("http://httpbin.org:{}".format(httpbin.port))
+            urlopen(f"http://localhost:{httpbin.port}")
+            urlopen(f"http://httpbin.org:{httpbin.port}")
             assert len(cass) == 1

tests/integration/test_proxy.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """Test using a proxy."""
 
 import http.server

tests/integration/test_register_matcher.py

@@ -1,5 +1,7 @@
 from urllib.request import urlopen
 
+import pytest
+
 import vcr
 
 
@@ -11,6 +13,7 @@ def false_matcher(r1, r2):
     return False
 
 
+@pytest.mark.online
 def test_registered_true_matcher(tmpdir, mockbin_request_url):
     my_vcr = vcr.VCR()
     my_vcr.register_matcher("true", true_matcher)
@@ -26,6 +29,7 @@ def test_registered_true_matcher(tmpdir, mockbin_request_url):
         urlopen(mockbin_request_url)
 
 
+@pytest.mark.online
 def test_registered_false_matcher(tmpdir, mockbin_request_url):
     my_vcr = vcr.VCR()
     my_vcr.register_matcher("false", false_matcher)

tests/integration/test_register_persister.py

@@ -1,16 +1,17 @@
-# -*- coding: utf-8 -*-
 """Tests for cassettes with custom persistence"""
 
 # External imports
 import os
 from urllib.request import urlopen
 
+import pytest
+
 # Internal imports
 import vcr
-from vcr.persisters.filesystem import FilesystemPersister
+from vcr.persisters.filesystem import CassetteDecodeError, CassetteNotFoundError, FilesystemPersister
 
 
-class CustomFilesystemPersister(object):
+class CustomFilesystemPersister:
     """Behaves just like default FilesystemPersister but adds .test extension
     to the cassette file"""
 
@@ -25,6 +26,19 @@ class CustomFilesystemPersister(object):
         FilesystemPersister.save_cassette(cassette_path, cassette_dict, serializer)
 
 
+class BadPersister(FilesystemPersister):
+    """A bad persister that raises different errors."""
+
+    @staticmethod
+    def load_cassette(cassette_path, serializer):
+        if "nonexistent" in cassette_path:
+            raise CassetteNotFoundError()
+        elif "encoding" in cassette_path:
+            raise CassetteDecodeError()
+        else:
+            raise ValueError("buggy persister")
+
+
 def test_save_cassette_with_custom_persister(tmpdir, httpbin):
     """Ensure you can save a cassette using custom persister"""
     my_vcr = vcr.VCR()
@@ -53,3 +67,22 @@ def test_load_cassette_with_custom_persister(tmpdir, httpbin):
     with my_vcr.use_cassette(test_fixture, serializer="json"):
         response = urlopen(httpbin.url).read()
         assert b"difficult sometimes" in response
+
+
+def test_load_cassette_persister_exception_handling(tmpdir, httpbin):
+    """
+    Ensure expected errors from persister are swallowed while unexpected ones
+    are passed up the call stack.
+    """
+    my_vcr = vcr.VCR()
+    my_vcr.register_persister(BadPersister)
+
+    with my_vcr.use_cassette("bad/nonexistent") as cass:
+        assert len(cass) == 0
+
+    with my_vcr.use_cassette("bad/encoding") as cass:
+        assert len(cass) == 0
+
+    with pytest.raises(ValueError):
+        with my_vcr.use_cassette("bad/buggy") as cass:
+            pass

tests/integration/test_requests.py

@@ -1,6 +1,6 @@
 """Test requests' interaction with vcr"""
 import pytest
-from assertions import assert_cassette_empty, assert_is_json
+from assertions import assert_cassette_empty, assert_is_json_bytes
 
 import vcr
 
@@ -114,22 +114,6 @@ def test_post_chunked_binary(tmpdir, httpbin):
     assert req1 == req2
 
 
-@pytest.mark.skipif("sys.version_info >= (3, 6)", strict=True, raises=ConnectionError)
-def test_post_chunked_binary_secure(tmpdir, httpbin_secure):
-    """Ensure that we can send chunked binary without breaking while trying to concatenate bytes with str."""
-    data1 = iter([b"data", b"to", b"send"])
-    data2 = iter([b"data", b"to", b"send"])
-    url = httpbin_secure.url + "/post"
-    with vcr.use_cassette(str(tmpdir.join("requests.yaml"))):
-        req1 = requests.post(url, data1).content
-        print(req1)
-
-    with vcr.use_cassette(str(tmpdir.join("requests.yaml"))):
-        req2 = requests.post(url, data2).content
-
-    assert req1 == req2
-
-
 def test_redirects(tmpdir, httpbin_both):
     """Ensure that we can handle redirects"""
     url = httpbin_both + "/redirect-to?url=bytes/1024"
@@ -144,6 +128,17 @@ def test_redirects(tmpdir, httpbin_both):
         assert cass.play_count == 2
 
 
+def test_raw_stream(tmpdir, httpbin):
+    expected_response = requests.get(httpbin.url, stream=True)
+    expected_content = b"".join(expected_response.raw.stream())
+
+    for _ in range(2):  # one for recording, one for cassette reply
+        with vcr.use_cassette(str(tmpdir.join("raw_stream.yaml"))):
+            actual_response = requests.get(httpbin.url, stream=True)
+            actual_content = b"".join(actual_response.raw.stream())
+        assert actual_content == expected_content
+
+
 def test_cross_scheme(tmpdir, httpbin_secure, httpbin):
     """Ensure that requests between schemes are treated separately"""
     # First fetch a url under http, and then again under https and then
@@ -156,20 +151,40 @@ def test_cross_scheme(tmpdir, httpbin_secure, httpbin):
         assert len(cass) == 2
 
 
-def test_gzip(tmpdir, httpbin_both):
+def test_gzip__decode_compressed_response_false(tmpdir, httpbin_both):
     """
     Ensure that requests (actually urllib3) is able to automatically decompress
     the response body
     """
+    for _ in range(2):  # one for recording, one for re-playing
+        with vcr.use_cassette(str(tmpdir.join("gzip.yaml"))):
+            response = requests.get(httpbin_both + "/gzip")
+            assert response.headers["content-encoding"] == "gzip"  # i.e. not removed
+            assert_is_json_bytes(response.content)  # i.e. uncompressed bytes
+
+
+def test_gzip__decode_compressed_response_true(tmpdir, httpbin_both):
     url = httpbin_both + "/gzip"
-    response = requests.get(url)
 
-    with vcr.use_cassette(str(tmpdir.join("gzip.yaml"))):
-        response = requests.get(url)
-        assert_is_json(response.content)
+    expected_response = requests.get(url)
+    expected_content = expected_response.content
+    assert expected_response.headers["content-encoding"] == "gzip"  # self-test
 
-    with vcr.use_cassette(str(tmpdir.join("gzip.yaml"))):
-        assert_is_json(response.content)
+    with vcr.use_cassette(
+        str(tmpdir.join("decode_compressed.yaml")), decode_compressed_response=True
+    ) as cassette:
+        r = requests.get(url)
+        assert r.headers["content-encoding"] == "gzip"  # i.e. not removed
+        assert r.content == expected_content
+
+    # Has the cassette body been decompressed?
+    cassette_response_body = cassette.responses[0]["body"]["string"]
+    assert isinstance(cassette_response_body, str)
+
+    with vcr.use_cassette(str(tmpdir.join("decode_compressed.yaml")), decode_compressed_response=True):
+        r = requests.get(url)
+        assert "content-encoding" not in r.headers  # i.e. removed
+        assert r.content == expected_content
 
 
 def test_session_and_connection_close(tmpdir, httpbin):

tests/integration/test_stubs.py

@@ -2,7 +2,7 @@ import http.client as httplib
 import json
 import zlib
 
-from assertions import assert_is_json
+from assertions import assert_is_json_bytes
 
 import vcr
 
@@ -84,7 +84,7 @@ def test_original_decoded_response_is_not_modified(tmpdir, httpbin):
         inside = conn.getresponse()
 
         assert "content-encoding" not in inside.headers
-        assert_is_json(inside.read())
+        assert_is_json_bytes(inside.read())
 
 
 def _make_before_record_response(fields, replacement="[REDACTED]"):

tests/integration/test_tornado.py

@@ -1,10 +1,9 @@
-# -*- coding: utf-8 -*-
 """Test requests' interaction with vcr"""
 
 import json
 
 import pytest
-from assertions import assert_cassette_empty, assert_is_json
+from assertions import assert_cassette_empty, assert_is_json_bytes
 
 import vcr
 from vcr.errors import CannotOverwriteExistingCassetteException
@@ -195,11 +194,11 @@ def test_gzip(get_client, tmpdir, scheme):
 
     with vcr.use_cassette(str(tmpdir.join("gzip.yaml"))):
         response = yield get(get_client(), url, **kwargs)
-        assert_is_json(response.body)
+        assert_is_json_bytes(response.body)
 
     with vcr.use_cassette(str(tmpdir.join("gzip.yaml"))) as cass:
         response = yield get(get_client(), url, **kwargs)
-        assert_is_json(response.body)
+        assert_is_json_bytes(response.body)
         assert 1 == cass.play_count
 
 

tests/integration/test_urllib2.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """Integration tests with urllib2"""
 
 import ssl
@@ -7,6 +6,7 @@ from urllib.request import urlopen
 
 import pytest_httpbin.certs
 from assertions import assert_cassette_has_one_response
+from pytest import mark
 
 # Internal imports
 import vcr
@@ -56,6 +56,7 @@ def test_response_headers(httpbin_both, tmpdir):
         assert sorted(open1) == sorted(open2)
 
 
+@mark.online
 def test_effective_url(tmpdir):
     """Ensure that the effective_url is captured"""
     url = "http://mockbin.org/redirect/301"

tests/integration/test_urllib3.py

@@ -4,7 +4,7 @@
 
 import pytest
 import pytest_httpbin
-from assertions import assert_cassette_empty, assert_is_json
+from assertions import assert_cassette_empty, assert_is_json_bytes
 
 import vcr
 from vcr.patch import force_reset
@@ -97,6 +97,7 @@ def test_post(tmpdir, httpbin_both, verify_pool_mgr):
     assert req1 == req2
 
 
+@pytest.mark.online
 def test_redirects(tmpdir, verify_pool_mgr):
     """Ensure that we can handle redirects"""
     url = "http://mockbin.org/redirect/301"
@@ -135,10 +136,10 @@ def test_gzip(tmpdir, httpbin_both, verify_pool_mgr):
 
     with vcr.use_cassette(str(tmpdir.join("gzip.yaml"))):
         response = verify_pool_mgr.request("GET", url)
-        assert_is_json(response.data)
+        assert_is_json_bytes(response.data)
 
     with vcr.use_cassette(str(tmpdir.join("gzip.yaml"))):
-        assert_is_json(response.data)
+        assert_is_json_bytes(response.data)
 
 
 def test_https_with_cert_validation_disabled(tmpdir, httpbin_secure, pool_mgr):

tests/integration/test_wild.py

@@ -52,6 +52,7 @@ def test_flickr_multipart_upload(httpbin, tmpdir):
         assert cass.play_count == 1
 
 
+@pytest.mark.online
 def test_flickr_should_respond_with_200(tmpdir):
     testfile = str(tmpdir.join("flickr.yml"))
     with vcr.use_cassette(testfile):
@@ -70,6 +71,7 @@ def test_cookies(tmpdir, httpbin):
         assert sorted(r2.json()["cookies"].keys()) == ["k1", "k2"]
 
 
+@pytest.mark.online
 def test_amazon_doctype(tmpdir):
     # amazon gzips its homepage.  For some reason, in requests 2.7, it's not
     # getting gunzipped.

tests/unit/test_cassettes.py

@@ -29,6 +29,19 @@ def test_cassette_load(tmpdir):
     assert len(a_cassette) == 1
 
 
+def test_cassette_load_nonexistent():
+    a_cassette = Cassette.load(path="something/nonexistent.yml")
+    assert len(a_cassette) == 0
+
+
+def test_cassette_load_invalid_encoding(tmpdir):
+    a_file = tmpdir.join("invalid_encoding.yml")
+    with open(a_file, "wb") as fd:
+        fd.write(b"\xda")
+    a_cassette = Cassette.load(path=str(a_file))
+    assert len(a_cassette) == 0
+
+
 def test_cassette_not_played():
     a = Cassette("test")
     assert not a.play_count

tests/unit/test_filters.py

@@ -298,6 +298,18 @@ def test_decode_response_deflate():
     assert decoded_response["headers"]["content-length"] == [str(len(body))]
 
 
+def test_decode_response_deflate_already_decompressed():
+    body = b"deflate message"
+    gzip_response = {
+        "body": {"string": body},
+        "headers": {
+            "content-encoding": ["deflate"],
+        },
+    }
+    decoded_response = decode_response(gzip_response)
+    assert decoded_response["body"]["string"] == body
+
+
 def test_decode_response_gzip():
     body = b"gzip message"
 
@@ -325,3 +337,15 @@ def test_decode_response_gzip():
     decoded_response = decode_response(gzip_response)
     assert decoded_response["body"]["string"] == body
     assert decoded_response["headers"]["content-length"] == [str(len(body))]
+
+
+def test_decode_response_gzip_already_decompressed():
+    body = b"gzip message"
+    gzip_response = {
+        "body": {"string": body},
+        "headers": {
+            "content-encoding": ["gzip"],
+        },
+    }
+    decoded_response = decode_response(gzip_response)
+    assert decoded_response["body"]["string"] == body

tests/unit/test_migration.py

@@ -17,9 +17,9 @@ def test_try_migrate_with_json(tmpdir):
     cassette = tmpdir.join("cassette.json").strpath
     shutil.copy("tests/fixtures/migration/old_cassette.json", cassette)
     assert vcr.migration.try_migrate(cassette)
-    with open("tests/fixtures/migration/new_cassette.json", "r") as f:
+    with open("tests/fixtures/migration/new_cassette.json") as f:
         expected_json = json.load(f)
-    with open(cassette, "r") as f:
+    with open(cassette) as f:
         actual_json = json.load(f)
     assert actual_json == expected_json
 
@@ -28,9 +28,9 @@ def test_try_migrate_with_yaml(tmpdir):
     cassette = tmpdir.join("cassette.yaml").strpath
     shutil.copy("tests/fixtures/migration/old_cassette.yaml", cassette)
     assert vcr.migration.try_migrate(cassette)
-    with open("tests/fixtures/migration/new_cassette.yaml", "r") as f:
+    with open("tests/fixtures/migration/new_cassette.yaml") as f:
         expected_yaml = yaml.load(f, Loader=Loader)
-    with open(cassette, "r") as f:
+    with open(cassette) as f:
         actual_yaml = yaml.load(f, Loader=Loader)
     assert actual_yaml == expected_yaml
 

tests/unit/test_response.py

@@ -1,4 +1,3 @@
-# coding: UTF-8
 import io
 
 from vcr.stubs import VCRHTTPResponse
@@ -93,7 +92,7 @@ def test_response_parses_correctly_and_fp_attribute_error_is_not_thrown():
         },
     }
     vcr_response = VCRHTTPResponse(recorded_response)
-    handle = io.TextIOWrapper(io.BufferedReader(vcr_response), encoding="utf-8")
+    handle = io.TextIOWrapper(vcr_response, encoding="utf-8")
     handle = iter(handle)
     articles = [line for line in handle]
     assert len(articles) > 1

tests/unit/test_serialize.py

@@ -1,4 +1,3 @@
-# -*- encoding: utf-8 -*-
 from unittest import mock
 
 import pytest
@@ -9,24 +8,24 @@ from vcr.serializers import compat, jsonserializer, yamlserializer
 
 
 def test_deserialize_old_yaml_cassette():
-    with open("tests/fixtures/migration/old_cassette.yaml", "r") as f:
+    with open("tests/fixtures/migration/old_cassette.yaml") as f:
         with pytest.raises(ValueError):
             deserialize(f.read(), yamlserializer)
 
 
 def test_deserialize_old_json_cassette():
-    with open("tests/fixtures/migration/old_cassette.json", "r") as f:
+    with open("tests/fixtures/migration/old_cassette.json") as f:
         with pytest.raises(ValueError):
             deserialize(f.read(), jsonserializer)
 
 
 def test_deserialize_new_yaml_cassette():
-    with open("tests/fixtures/migration/new_cassette.yaml", "r") as f:
+    with open("tests/fixtures/migration/new_cassette.yaml") as f:
         deserialize(f.read(), yamlserializer)
 
 
 def test_deserialize_new_json_cassette():
-    with open("tests/fixtures/migration/new_cassette.json", "r") as f:
+    with open("tests/fixtures/migration/new_cassette.json") as f:
         deserialize(f.read(), jsonserializer)
 
 

tests/unit/test_stubs.py

@@ -1,5 +1,7 @@
 from unittest import mock
 
+from pytest import mark
+
 from vcr import mode
 from vcr.cassette import Cassette
 from vcr.stubs import VCRHTTPSConnection
@@ -11,6 +13,7 @@ class TestVCRConnection:
         vcr_connection.ssl_version = "example_ssl_version"
         assert vcr_connection.real_connection.ssl_version == "example_ssl_version"
 
+    @mark.online
     @mock.patch("vcr.cassette.Cassette.can_play_response_for", return_value=False)
     def testing_connect(*args):
         vcr_connection = VCRHTTPSConnection("www.google.com")

tests/unit/test_unittest.py

@@ -0,0 +1,199 @@
+import os
+from unittest import TextTestRunner, defaultTestLoader
+from unittest.mock import MagicMock
+from urllib.request import urlopen
+
+import pytest
+
+from vcr.unittest import VCRTestCase
+
+
+def test_defaults():
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            pass
+
+    test = run_testcase(MyTest)[0][0]
+    expected_path = os.path.join(os.path.dirname(__file__), "cassettes")
+    expected_name = "MyTest.test_foo.yaml"
+    assert os.path.dirname(test.cassette._path) == expected_path
+    assert os.path.basename(test.cassette._path) == expected_name
+
+
+def test_disabled():
+    # Baseline vcr_enabled = True
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            pass
+
+    test = run_testcase(MyTest)[0][0]
+    assert hasattr(test, "cassette")
+
+    # Test vcr_enabled = False
+    class MyTest(VCRTestCase):
+        vcr_enabled = False
+
+        def test_foo(self):
+            pass
+
+    test = run_testcase(MyTest)[0][0]
+    assert not hasattr(test, "cassette")
+
+
+def test_cassette_library_dir():
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            pass
+
+        def _get_cassette_library_dir(self):
+            return "/testing"
+
+    test = run_testcase(MyTest)[0][0]
+    assert test.cassette._path.startswith("/testing/")
+
+
+def test_cassette_name():
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            pass
+
+        def _get_cassette_name(self):
+            return "my-custom-name"
+
+    test = run_testcase(MyTest)[0][0]
+    assert os.path.basename(test.cassette._path) == "my-custom-name"
+
+
+def test_vcr_kwargs_overridden():
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            pass
+
+        def _get_vcr_kwargs(self):
+            kwargs = super()._get_vcr_kwargs()
+            kwargs["record_mode"] = "new_episodes"
+            return kwargs
+
+    test = run_testcase(MyTest)[0][0]
+    assert test.cassette.record_mode == "new_episodes"
+
+
+def test_vcr_kwargs_passed():
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            pass
+
+        def _get_vcr_kwargs(self):
+            return super()._get_vcr_kwargs(
+                record_mode="new_episodes",
+            )
+
+    test = run_testcase(MyTest)[0][0]
+    assert test.cassette.record_mode == "new_episodes"
+
+
+def test_vcr_kwargs_cassette_dir():
+    # Test that _get_cassette_library_dir applies if cassette_library_dir
+    # is absent from vcr kwargs.
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            pass
+
+        def _get_vcr_kwargs(self):
+            return dict(
+                record_mode="new_episodes",
+            )
+
+        _get_cassette_library_dir = MagicMock(return_value="/testing")
+
+    test = run_testcase(MyTest)[0][0]
+    assert test.cassette._path.startswith("/testing/")
+    assert test._get_cassette_library_dir.call_count == 1
+
+    # Test that _get_cassette_library_dir is ignored if cassette_library_dir
+    # is present in vcr kwargs.
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            pass
+
+        def _get_vcr_kwargs(self):
+            return dict(
+                cassette_library_dir="/testing",
+            )
+
+        _get_cassette_library_dir = MagicMock(return_value="/ignored")
+
+    test = run_testcase(MyTest)[0][0]
+    assert test.cassette._path.startswith("/testing/")
+    assert test._get_cassette_library_dir.call_count == 0
+
+
+@pytest.mark.online
+def test_get_vcr_with_matcher(tmpdir):
+    cassette_dir = tmpdir.mkdir("cassettes")
+    assert len(cassette_dir.listdir()) == 0
+
+    mock_matcher = MagicMock(return_value=True, __name__="MockMatcher")
+
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            self.response = urlopen("http://example.com").read()
+
+        def _get_vcr(self):
+            myvcr = super()._get_vcr()
+            myvcr.register_matcher("mymatcher", mock_matcher)
+            myvcr.match_on = ["mymatcher"]
+            return myvcr
+
+        def _get_cassette_library_dir(self):
+            return str(cassette_dir)
+
+    # First run to fill cassette.
+    test = run_testcase(MyTest)[0][0]
+    assert len(test.cassette.requests) == 1
+    assert not mock_matcher.called  # nothing in cassette
+
+    # Second run to call matcher.
+    test = run_testcase(MyTest)[0][0]
+    assert len(test.cassette.requests) == 1
+    assert mock_matcher.called
+    assert (
+        repr(mock_matcher.mock_calls[0])
+        == "call(<Request (GET) http://example.com>, <Request (GET) http://example.com>)"
+    )
+
+
+@pytest.mark.online
+def test_testcase_playback(tmpdir):
+    cassette_dir = tmpdir.mkdir("cassettes")
+    assert len(cassette_dir.listdir()) == 0
+
+    # First test actually reads from the web.
+
+    class MyTest(VCRTestCase):
+        def test_foo(self):
+            self.response = urlopen("http://example.com").read()
+
+        def _get_cassette_library_dir(self):
+            return str(cassette_dir)
+
+    test = run_testcase(MyTest)[0][0]
+    assert b"illustrative examples" in test.response
+    assert len(test.cassette.requests) == 1
+    assert test.cassette.play_count == 0
+
+    # Second test reads from cassette.
+
+    test2 = run_testcase(MyTest)[0][0]
+    assert test.cassette is not test2.cassette
+    assert b"illustrative examples" in test.response
+    assert len(test2.cassette.requests) == 1
+    assert test2.cassette.play_count == 1
+
+
+def run_testcase(testcase_class):
+    """Run all the tests in a TestCase and return them."""
+    suite = defaultTestLoader.loadTestsFromTestCase(testcase_class)
+    tests = list(suite._tests)
+    result = TextTestRunner().run(suite)
+    return tests, result

tox.ini

@@ -3,7 +3,7 @@ skip_missing_interpreters=true
 envlist =
   cov-clean,
   lint,
-  {py37,py38,py39,py310,py311}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3,aiohttp,httpx},
+  {py38,py39,py310,py311}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3,aiohttp,httpx},
   {py310,py311}-{requests-urllib3-2,urllib3-2},
   {pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},
   {py310}-httpx019,
@@ -12,7 +12,6 @@ envlist =
 
 [gh-actions]
 python =
-    3.7: py37
     3.8: py38
     3.9: py39
     3.10: py310, lint
@@ -66,9 +65,9 @@ deps =
 # In other circumstances, we might want to generate a PDF or an ebook
 commands =
     sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html
-# We use Python 3.7. Tox sometimes tries to autodetect it based on the name of
+# We use Python 3.8. Tox sometimes tries to autodetect it based on the name of
 # the testenv, but "docs" does not give useful clues so we have to be explicit.
-basepython = python3.7
+basepython = python3.8
 
 [testenv]
 # Need to use develop install so that paths
@@ -94,15 +93,14 @@ deps =
     aiohttp: pytest-asyncio
     aiohttp: pytest-aiohttp
     httpx: httpx
-    {py37,py38,py39,py310}-{httpx}: httpx
-    {py37,py38,py39,py310}-{httpx}: pytest-asyncio
+    {py38,py39,py310}-{httpx}: httpx
+    {py38,py39,py310}-{httpx}: pytest-asyncio
     httpx: httpx>0.19
-    # httpx==0.19 is the latest version that supports allow_redirects, newer versions use follow_redirects
     httpx019: httpx==0.19
-    {py37,py38,py39,py310}-{httpx}: pytest-asyncio
+    {py38,py39,py310}-{httpx}: pytest-asyncio
 depends =
-  lint,{py37,py38,py39,py310,py311,pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},{py310,py311}-{requests-urllib3-2,urllib3-2},{py37,py38,py39,py310,py311}-{aiohttp},{py37,py38,py39,py310,py311}-{httpx}: cov-clean
-  cov-report: lint,{py37,py38,py39,py310,py311,pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},{py310,py311}-{requests-urllib3-2,urllib3-2},{py37,py38,py39,py310,py311}-{aiohttp}
+  lint,{py38,py39,py310,py311,pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},{py310,py311}-{requests-urllib3-2,urllib3-2},{py38,py39,py310,py311}-{aiohttp},{py38,py39,py310,py311}-{httpx}: cov-clean
+  cov-report: lint,{py38,py39,py310,py311,pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},{py310,py311}-{requests-urllib3-2,urllib3-2},{py38,py39,py310,py311}-{aiohttp}
 passenv =
     AWS_ACCESS_KEY_ID
     AWS_DEFAULT_REGION

vcr/__init__.py

@@ -4,7 +4,7 @@ from logging import NullHandler
 from .config import VCR
 from .record_mode import RecordMode as mode  # noqa import is not used in this file
 
-__version__ = "4.3.1"
+__version__ = "5.0.0"
 
 logging.getLogger(__name__).addHandler(NullHandler())
 

vcr/cassette.py

@@ -11,7 +11,7 @@ from ._handle_coroutine import handle_coroutine
 from .errors import UnhandledHTTPRequestError
 from .matchers import get_matchers_results, method, requests_match, uri
 from .patch import CassettePatcherBuilder
-from .persisters.filesystem import FilesystemPersister
+from .persisters.filesystem import CassetteDecodeError, CassetteNotFoundError, FilesystemPersister
 from .record_mode import RecordMode
 from .serializers import yamlserializer
 from .util import partition_dict
@@ -280,7 +280,7 @@ class Cassette:
                 return response
         # The cassette doesn't contain the request asked for.
         raise UnhandledHTTPRequestError(
-            "The cassette (%r) doesn't contain the request (%r) asked for" % (self._path, request)
+            f"The cassette ({self._path!r}) doesn't contain the request ({request!r}) asked for"
         )
 
     def responses_of(self, request):
@@ -295,7 +295,7 @@ class Cassette:
             return responses
         # The cassette doesn't contain the request asked for.
         raise UnhandledHTTPRequestError(
-            "The cassette (%r) doesn't contain the request (%r) asked for" % (self._path, request)
+            f"The cassette ({self._path!r}) doesn't contain the request ({request!r}) asked for"
         )
 
     def rewind(self):
@@ -352,11 +352,11 @@ class Cassette:
                 self.append(request, response)
             self.dirty = False
             self.rewound = True
-        except ValueError:
+        except (CassetteDecodeError, CassetteNotFoundError):
             pass
 
     def __str__(self):
-        return "<Cassette containing {} recorded response(s)>".format(len(self))
+        return f"<Cassette containing {len(self)} recorded response(s)>"
 
     def __len__(self):
         """Return the number of request,response pairs stored in here"""

vcr/config.py

@@ -88,7 +88,7 @@ class VCR:
         try:
             serializer = self.serializers[serializer_name]
         except KeyError:
-            raise KeyError("Serializer {} doesn't exist or isn't registered".format(serializer_name))
+            raise KeyError(f"Serializer {serializer_name} doesn't exist or isn't registered")
         return serializer
 
     def _get_matchers(self, matcher_names):
@@ -97,7 +97,7 @@ class VCR:
             for m in matcher_names:
                 matchers.append(self.matchers[m])
         except KeyError:
-            raise KeyError("Matcher {} doesn't exist or isn't registered".format(m))
+            raise KeyError(f"Matcher {m} doesn't exist or isn't registered")
         return matchers
 
     def use_cassette(self, path=None, **kwargs):
@@ -219,7 +219,7 @@ class VCR:
             filter_functions.extend(before_record_request)
 
         def before_record_request(request):
-            request = copy.copy(request)
+            request = copy.deepcopy(request)
             for function in filter_functions:
                 if request is None:
                     break

vcr/filters.py

@@ -153,9 +153,15 @@ def decode_response(response):
         if not body:
             return ""
         if encoding == "gzip":
-            return zlib.decompress(body, zlib.MAX_WBITS | 16)
+            try:
+                return zlib.decompress(body, zlib.MAX_WBITS | 16)
+            except zlib.error:
+                return body  # assumes that the data was already decompressed
         else:  # encoding == 'deflate'
-            return zlib.decompress(body)
+            try:
+                return zlib.decompress(body)
+            except zlib.error:
+                return body  # assumes that the data was already decompressed
 
     # Deepcopy here in case `headers` contain objects that could
     # be mutated by a shallow copy and corrupt the real response.

vcr/matchers.py

@@ -9,35 +9,43 @@ log = logging.getLogger(__name__)
 
 
 def method(r1, r2):
-    assert r1.method == r2.method, "{} != {}".format(r1.method, r2.method)
+    if r1.method != r2.method:
+        raise AssertionError(f"{r1.method} != {r2.method}")
 
 
 def uri(r1, r2):
-    assert r1.uri == r2.uri, "{} != {}".format(r1.uri, r2.uri)
+    if r1.uri != r2.uri:
+        raise AssertionError(f"{r1.uri} != {r2.uri}")
 
 
 def host(r1, r2):
-    assert r1.host == r2.host, "{} != {}".format(r1.host, r2.host)
+    if r1.host != r2.host:
+        raise AssertionError(f"{r1.host} != {r2.host}")
 
 
 def scheme(r1, r2):
-    assert r1.scheme == r2.scheme, "{} != {}".format(r1.scheme, r2.scheme)
+    if r1.scheme != r2.scheme:
+        raise AssertionError(f"{r1.scheme} != {r2.scheme}")
 
 
 def port(r1, r2):
-    assert r1.port == r2.port, "{} != {}".format(r1.port, r2.port)
+    if r1.port != r2.port:
+        raise AssertionError(f"{r1.port} != {r2.port}")
 
 
 def path(r1, r2):
-    assert r1.path == r2.path, "{} != {}".format(r1.path, r2.path)
+    if r1.path != r2.path:
+        raise AssertionError(f"{r1.path} != {r2.path}")
 
 
 def query(r1, r2):
-    assert r1.query == r2.query, "{} != {}".format(r1.query, r2.query)
+    if r1.query != r2.query:
+        raise AssertionError(f"{r1.query} != {r2.query}")
 
 
 def raw_body(r1, r2):
-    assert read_body(r1) == read_body(r2)
+    if read_body(r1) != read_body(r2):
+        raise AssertionError
 
 
 def body(r1, r2):
@@ -45,11 +53,13 @@ def body(r1, r2):
     r2_transformer = _get_transformer(r2)
     if transformer != r2_transformer:
         transformer = _identity
-    assert transformer(read_body(r1)) == transformer(read_body(r2))
+    if transformer(read_body(r1)) != transformer(read_body(r2)):
+        raise AssertionError
 
 
 def headers(r1, r2):
-    assert r1.headers == r2.headers, "{} != {}".format(r1.headers, r2.headers)
+    if r1.headers != r2.headers:
+        raise AssertionError(f"{r1.headers} != {r2.headers}")
 
 
 def _header_checker(value, header="Content-Type"):
@@ -97,7 +107,7 @@ def _get_transformer(request):
 def requests_match(r1, r2, matchers):
     successes, failures = get_matchers_results(r1, r2, matchers)
     if failures:
-        log.debug("Requests {} and {} differ.\n" "Failure details:\n" "{}".format(r1, r2, failures))
+        log.debug(f"Requests {r1} and {r2} differ.\nFailure details:\n{failures}")
     return len(failures) == 0
 
 

vcr/migration.py

@@ -7,7 +7,7 @@ It merges and deletes the request obsolete keys (protocol, host, port, path)
 into new 'uri' key.
 Usage::
 
-    python -m vcr.migration PATH
+    python3 -m vcr.migration PATH
 
 The PATH can be path to the directory with cassettes or cassette itself
 """
@@ -55,7 +55,7 @@ def build_uri(**parts):
     port = parts["port"]
     scheme = parts["protocol"]
     default_port = {"https": 443, "http": 80}[scheme]
-    parts["port"] = ":{}".format(port) if port != default_port else ""
+    parts["port"] = f":{port}" if port != default_port else ""
     return "{protocol}://{host}{port}{path}".format(**parts)
 
 
@@ -118,7 +118,7 @@ def migrate(file_path, migration_fn):
     # because we assume that original files can be reverted
     # we will try to copy the content. (os.rename not needed)
     with tempfile.TemporaryFile(mode="w+") as out_fp:
-        with open(file_path, "r") as in_fp:
+        with open(file_path) as in_fp:
             if not migration_fn(in_fp, out_fp):
                 return False
         with open(file_path, "w") as in_fp:
@@ -138,7 +138,7 @@ def try_migrate(path):
 def main():
     if len(sys.argv) != 2:
         raise SystemExit(
-            "Please provide path to cassettes directory or file. " "Usage: python -m vcr.migration PATH"
+            "Please provide path to cassettes directory or file. " "Usage: python3 -m vcr.migration PATH"
         )
 
     path = sys.argv[1]
@@ -150,7 +150,7 @@ def main():
     for file_path in files:
         migrated = try_migrate(file_path)
         status = "OK" if migrated else "FAIL"
-        sys.stderr.write("[{}] {}\n".format(status, file_path))
+        sys.stderr.write(f"[{status}] {file_path}\n")
     sys.stderr.write("Done.\n")
 
 

vcr/patch.py

@@ -186,9 +186,7 @@ class CassettePatcherBuilder:
         bases = (base_class,)
         if not issubclass(base_class, object):  # Check for old style class
             bases += (object,)
-        return type(
-            "{}{}".format(base_class.__name__, self._cassette._path), bases, dict(cassette=self._cassette)
-        )
+        return type(f"{base_class.__name__}{self._cassette._path}", bases, dict(cassette=self._cassette))
 
     @_build_patchers_from_mock_triples_decorator
     def _httplib(self):

vcr/persisters/filesystem.py

@@ -5,17 +5,25 @@ from pathlib import Path
 from ..serialize import deserialize, serialize
 
 
+class CassetteNotFoundError(FileNotFoundError):
+    pass
+
+
+class CassetteDecodeError(ValueError):
+    pass
+
+
 class FilesystemPersister:
     @classmethod
     def load_cassette(cls, cassette_path, serializer):
         cassette_path = Path(cassette_path)  # if cassette path is already Path this is no operation
         if not cassette_path.is_file():
-            raise ValueError("Cassette not found.")
+            raise CassetteNotFoundError()
         try:
             with cassette_path.open() as f:
                 data = f.read()
-        except UnicodeEncodeError as err:
-            raise ValueError("Can't read Cassette, Encoding is broken") from err
+        except UnicodeDecodeError as err:
+            raise CassetteDecodeError("Can't read Cassette, Encoding is broken") from err
 
         return deserialize(data, serializer)
 

vcr/request.py

@@ -90,7 +90,7 @@ class Request:
         return self.scheme
 
     def __str__(self):
-        return "<Request ({}) {}>".format(self.method, self.uri)
+        return f"<Request ({self.method}) {self.uri}>"
 
     def __repr__(self):
         return self.__str__()

vcr/stubs/__init__.py

@@ -93,6 +93,9 @@ class VCRHTTPResponse(HTTPResponse):
     def read(self, *args, **kwargs):
         return self._content.read(*args, **kwargs)
 
+    def read1(self, *args, **kwargs):
+        return self._content.read1(*args, **kwargs)
+
     def readall(self):
         return self._content.readall()
 
@@ -167,6 +170,13 @@ class VCRHTTPResponse(HTTPResponse):
     def drain_conn(self):
         pass
 
+    def stream(self, amt=65536, decode_content=None):
+        while True:
+            b = self._content.read(amt)
+            yield b
+            if not b:
+                break
+
 
 class VCRConnection:
     # A reference to the cassette that's currently being patched in
@@ -178,26 +188,26 @@ class VCRConnection:
         """
         port = self.real_connection.port
         default_port = {"https": 443, "http": 80}[self._protocol]
-        return ":{}".format(port) if port != default_port else ""
+        return f":{port}" if port != default_port else ""
 
     def _uri(self, url):
         """Returns request absolute URI"""
         if url and not url.startswith("/"):
             # Then this must be a proxy request.
             return url
-        uri = "{}://{}{}{}".format(self._protocol, self.real_connection.host, self._port_postfix(), url)
+        uri = f"{self._protocol}://{self.real_connection.host}{self._port_postfix()}{url}"
         log.debug("Absolute URI: %s", uri)
         return uri
 
     def _url(self, uri):
         """Returns request selector url from absolute URI"""
-        prefix = "{}://{}{}".format(self._protocol, self.real_connection.host, self._port_postfix())
+        prefix = f"{self._protocol}://{self.real_connection.host}{self._port_postfix()}"
         return uri.replace(prefix, "", 1)
 
     def request(self, method, url, body=None, headers=None, *args, **kwargs):
         """Persist the request metadata in self._vcr_request"""
         self._vcr_request = Request(method=method, uri=self._uri(url), body=body, headers=headers or {})
-        log.debug("Got {}".format(self._vcr_request))
+        log.debug(f"Got {self._vcr_request}")
 
         # Note: The request may not actually be finished at this point, so
         # I'm not sending the actual request until getresponse().  This
@@ -213,7 +223,7 @@ class VCRConnection:
         of putheader() calls.
         """
         self._vcr_request = Request(method=method, uri=self._uri(url), body="", headers={})
-        log.debug("Got {}".format(self._vcr_request))
+        log.debug(f"Got {self._vcr_request}")
 
     def putheader(self, header, *values):
         self._vcr_request.headers[header] = values
@@ -245,7 +255,7 @@ class VCRConnection:
         # Check to see if the cassette has a response for this request. If so,
         # then return it
         if self.cassette.can_play_response_for(self._vcr_request):
-            log.info("Playing response for {} from cassette".format(self._vcr_request))
+            log.info(f"Playing response for {self._vcr_request} from cassette")
             response = self.cassette.play_response(self._vcr_request)
             return VCRHTTPResponse(response)
         else:
@@ -257,7 +267,7 @@ class VCRConnection:
             # Otherwise, we should send the request, then get the response
             # and return it.
 
-            log.info("{} not in cassette, sending to real server".format(self._vcr_request))
+            log.info(f"{self._vcr_request} not in cassette, sending to real server")
             # This is imported here to avoid circular import.
             # TODO(@IvanMalison): Refactor to allow normal import.
             from vcr.patch import force_reset

vcr/stubs/aiohttp_stubs.py

@@ -261,7 +261,7 @@ def vcr_request(cassette, real_request):
         vcr_request = Request(method, str(request_url), data, _serialize_headers(headers))
 
         if cassette.can_play_response_for(vcr_request):
-            log.info("Playing response for {} from cassette".format(vcr_request))
+            log.info(f"Playing response for {vcr_request} from cassette")
             response = play_responses(cassette, vcr_request, kwargs)
             for redirect in response.history:
                 self._cookie_jar.update_cookies(redirect.cookies, redirect.url)

vcr/unittest.py

@@ -0,0 +1,39 @@
+import inspect
+import os
+import unittest
+
+from .config import VCR
+
+
+class VCRMixin:
+    """A TestCase mixin that provides VCR integration."""
+
+    vcr_enabled = True
+
+    def setUp(self):
+        super().setUp()
+        if self.vcr_enabled:
+            kwargs = self._get_vcr_kwargs()
+            myvcr = self._get_vcr(**kwargs)
+            cm = myvcr.use_cassette(self._get_cassette_name())
+            self.cassette = cm.__enter__()
+            self.addCleanup(cm.__exit__, None, None, None)
+
+    def _get_vcr(self, **kwargs):
+        if "cassette_library_dir" not in kwargs:
+            kwargs["cassette_library_dir"] = self._get_cassette_library_dir()
+        return VCR(**kwargs)
+
+    def _get_vcr_kwargs(self, **kwargs):
+        return kwargs
+
+    def _get_cassette_library_dir(self):
+        testdir = os.path.dirname(inspect.getfile(self.__class__))
+        return os.path.join(testdir, "cassettes")
+
+    def _get_cassette_name(self):
+        return f"{self.__class__.__name__}.{self._testMethodName}.yaml"
+
+
+class VCRTestCase(VCRMixin, unittest.TestCase):
+    pass

vcr/util.py

@@ -1,9 +1,5 @@
 import types
-
-try:
-    from collections.abc import Mapping, MutableMapping
-except ImportError:
-    from collections import Mapping, MutableMapping
+from collections.abc import Mapping, MutableMapping
 
 
 # Shamelessly stolen from https://github.com/kennethreitz/requests/blob/master/requests/structures.py