ImportError when running tests with --cov

[adiasg]

Encountering an error when running tests. I'm using consensus-specs @ 0b76c83.

Setup

make clean; make pyspec; make install_test; . venv/bin/activate; cd tests/core/pyspec/

$ python3 --version
Python 3.8.10
$ pip install py_arkworks_bls12381==0.3.4
Requirement already satisfied: py_arkworks_bls12381==0.3.4 in /home/ubuntu/specs/consensus-specs/venv/lib/python3.8/site-packages (0.3.4)

Error

$ python3 -m pytest --cov=eth2spec.phase0.minimal eth2spec
ImportError while loading conftest '/home/ubuntu/specs/consensus-specs/tests/core/pyspec/eth2spec/test/conftest.py'.
eth2spec/test/conftest.py:1: in <module>
    from eth2spec.test import context
eth2spec/test/context.py:6: in <module>
    from eth2spec.phase0 import mainnet as spec_phase0_mainnet, minimal as spec_phase0_minimal
eth2spec/phase0/__init__.py:1: in <module>
    from . import mainnet as spec  # noqa:F401
eth2spec/phase0/mainnet.py:15: in <module>
    from eth2spec.utils import bls
eth2spec/utils/bls.py:21: in <module>
    from py_arkworks_bls12381 import (
../../../venv/lib/python3.8/site-packages/py_arkworks_bls12381/__init__.py:1: in <module>
    from .py_arkworks_bls12381 import *
E   ImportError: PyO3 modules may only be initialized once per interpreter process

• This error appears when running running tests with any --cov flag.
• The other flags (-n, --disable-bls, --cov-report, and --cov-branch) do not cause this error - able to test successfully with these.

What I've tried so far:

• (Thanks @hwwhww!) Uninstall py_arkworks_bls12381 & build from source instead: $ pip install --no-binary py_arkworks_bls12381 py_arkworks_bls12381. This did not help with the error.

[saltiniroberto]

The following command allows running the tests without --cov

make COVERAGE_SCOPE="" test

[michaelneuder]

^ worked for me!