pytest-recording 0.5.0

Configuration

The recording configuration could be provided with vcr_config fixture, which could be any scope - session, package, module or function. It should return a dictionary that will be passed directly to VCR.use_cassettes under the hood.

import pytest

@pytest.fixture(scope="module")
def vcr_config():
    return {"filter_headers": ["authorization"]}

For more granular control you need to pass these keyword arguments to individual pytest.mark.vcr marks, and in this case all arguments will be merged into a single dictionary with the following priority (low -> high):

• vcr_config fixture

• all marks from the most broad scope (“session”) to the most narrow one (“function”)

Example:

import pytest

pytestmark = [pytest.mark.vcr(ignore_localhost=True)]

@pytest.fixture(scope="module")
def vcr_config():
    return {"filter_headers": ["authorization"]}

@pytest.mark.vcr(filter_headers=[])
def test_one():
    ...

@pytest.mark.vcr(filter_query_parameters=["api_key"])
def test_two():
    ...

Resulting VCR configs for each test:

• test_one - {"ignore_localhost": True, "filter_headers": []}

• test_two - {"ignore_localhost": True, "filter_headers": ["authorization"], "filter_query_parameters": ["api_key"]}

Blocking network access

To have more confidence that your tests will not go over the wire, you can block it with pytest.mark.block_network mark:

import pytest
import requests

@pytest.mark.block_network
def test_multiple():
    assert requests.get("http://httpbin.org/get").text == '{"get": true}'

...
# in case of access
RuntimeError: Network is disabled

Besides marks, the network access could be blocked globally with --block-network command-line option.

However, if VCR.py recording is enabled then, the network is not blocked for tests, that have pytest.mark.vcr.

Example:

import pytest
import requests

@pytest.mark.vcr
def test_multiple():
    assert requests.get("http://httpbin.org/get").text == '{"get": true}'

Run pytest:

$ pytest --record-mode=all --block-network tests/

The network blocking feature supports socket-based transports and pycurl.

It is possible to allow access to specified hosts during network blocking:

import pytest
import requests

@pytest.mark.block_network(allowed_hosts=["httpbin.*"]
def test_access():
    assert requests.get("http://httpbin.org/get").text == '{"get": true}'
    with pytest.raises(RuntimeError, match=r"^Network is disabled$"):
        requests.get("http://example.com")

Or via command line option:

$ pytest --record-mode=all --block-network --allowed-hosts=httpbin.*,localhost tests/