Provide a py.test fixture in addition to the decorator

When using py.test for tests it’s usually nicer to activate features like this using a fixture. The usage with the fixture (assuming it’s named responses) could be like this:

def test_my_api(responses):
    responses.add(responses.GET, 'http://twitter.com/api/1/foobar',
                  body='{"error": "not found"}', status=404,
                  content_type='application/json')

    # ...

I.e. instead of the decorator you’d use a responses fixture and instead of calling add as a global from the imported module (if you register it as a pytest plugin the user doesn’t need to import it at all) you’d call it on the object returned by the fixture function (which could simple be the module responses, but a wrapper would be cleaner of course).

[edmorley]

Since pytest 3.0 yield_fixture is deprecated in favour of using fixture directly: http://doc.pytest.org/en/latest/yieldfixture.html

ie:

@pytest.fixture
def responses():
    with responses.RequestsMock() as rsps:
        yield rsps

[tomviner]

Or even more simply:

@pytest.yield_fixture
def responses():
    with responses.RequestsMock() as rsps:
        yield rsps

Should we add this to the README?