Retrieve a value after the yield statement from a fixture

[TheoCrd]

I have a fixture

@pytest.fixture(scope="session", autouse=True)
def existing_crash_dumps(request):
    request.session.crash = False
    existing_crash_dumps = list_crash_dumps()
    print(f"Existing crash dumps before tests: {existing_crash_dumps}")

    yield existing_crash_dumps

    if is_new_dump(existing_crash_dumps):
        request.session.crash = True

Here, I want to retrieve the crash value and put it in my report

def pytest_runtest_makereport(item, call)
   crash = getattr(item, "crash")

But the value is always False, even when I entered the if statement after yield. I understood that after yield, we are in the teardown phase of a test, but is there a way to retrieve a value from this point? Basically, what's after the yield statement is what I want to check after a test has finished, hence checking at teardown.

[The-Compiler]

You're monkeypatching something onto the Session object but then are trying to retrieve it from the test Item.

It's unclear to me what your goal is (something checked for a session can by definition only exist for the entire session, not individual test items), so I can't really suggest much (beyond that you probably want to use Stash instead of monkeypatching attributes onto pytest objects).

[TheoCrd]

Oh gotcha, I also tried monkeypatching with request.node.crash but with the same result (aka None value). My goal is to have a fixture which initialize a boolean (crash) at the beginning of a test (I also list the content of a folder), and when the test is finished (hence my code after yield), I check the content of the folder, if it differs from the beginning, affect the value True. Thing is that, I wonder how to retrieve said value, to integrate it to the report.

I tried using the hook def pytest_runtest_makereport(item, call), but isn't this one used on the call phase of a test?

[The-Compiler]

If you want to do something for every test, why is your fixture session-scoped?

pytest_runtest_makereport gets called once for each of setup/call/teardown, see the pytest_runtest_protocol docs.

This works:

import pytest


@pytest.fixture(autouse=True)
def record_crash(request):
    yield
    request.node.crash = True


def pytest_runtest_makereport(item, call):
    if call.when == "teardown":
        assert item.crash

[TheoCrd]

Sorry, I did not check about the scope parameter.

Okay, so with your snippet of code, I would be able to retrieve the crash value in the report?
Let's say for example that I generate a json-report, I should see the crash key in it?

[The-Compiler]

Depends on how pytest-json-report works (and at which time it generates the report), but give it a try and see.

Also note that there is a semi-official pytest-reportlog plugin, which lets you use pytest's record_property fixture to directly add the metadata from inside your fixture.

[TheoCrd]

Got it! I was able to achieve what I wanted.
Oh, thanks for the intel, I will check the plugin out.