I’m trying to enable coverage for python with pants however I’m stuck. 1. When I set

use_coverage = true

in

pants.toml

it complains:

[pytest].extra_requirements is missing pytest-cov, which is needed to collect coverage data.

2. Since

pytest-cov

is a new

extra_requirement

for

pytest

, I have to run

./pants generate-lockfiles --resolve=pytest

. Otherwise, it complains with

InvalidLockfileError

. 3. However, when I run

./pants generate-lockfiles --resolve=pytest

, pants does not generate hashes for some dependencies. 4. So when I run

./pants test ::

it starts to complain:

ProcessExecutionFailure: Process 'Building pytest.pex from src/python/tests/lockfile_pytest.txt' failed with exit code 1.
stdout:

stderr:
ERROR: Hashes are required in --require-hashes mode, but they are missing from some requirements. Here is a list of those requirements along with the hashes their downloaded archives actually had. Add lines like these to your requirements files to prevent tampering. (If you did not enable --require-hashes manually, note that it turns on automatically when any package has a hash.)

any ideas?