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?

What version of pants are you using? I didn’t have to add any extra requirement for enabling coverage.

@refined-addition-53644 I suspect that's because you're using the default pants-provided lockfile for pytest, which includes it. Otherwise if you use your own, you have to also add the additional requirements if you want them.

The “pants does not generate hashes for some dependencies.” sounds like a bug

@happy-kitchen-89482 I wonder if this is https://github.com/pantsbuild/pants/discussions/16943?