`pytest` + `git bisect run` helper for https://github.com/ethereum/py-evm/issues/1152#issuecomment-417284202

checkfail.sh

#!/bin/sh
# simple wrapper for py-evm git bisection of submodule
# RUN AS:
#   cd fixtures
#   git bisect start develop 47b09f42c0681548a00da5ab1c98808b368af49a --
#   git bisect run ../checkfail.sh
#   <elevator music>
#   git bisect log
#   git bisect reset
# NOTE: assuming already in virtualenv!
# NOTE: pytest exit codes:
#   https://docs.pytest.org/en/latest/usage.html#possible-exit-codes

cd ..
pytest --cache-clear --quiet --exitfirst --show-capture=no -k "test_state_fixtures"
exitcode=$?
echo "DEBUG: pytest exited with code $exitcode"

# if [ $exitcode -ne 0 ]; then
#     # exit code non-zero - will mark bisect commit bad
#     # NOTE: add stuff here if needed
# else
#     # exit code zero - will mark bisect commit good
#     # NOTE: add stuff here if needed
# fi

exit $exitcode