test(parsers): Add tests for js and Python parsers

[JigyasuRajput]

Description:

Fixes #4874

This PR improves test coverage for Javascript and Python parsers

Changes:

• JavaScript Parser:
  • Added tests for process_yarn_lock (yarn.lock regex parsing).
  • Added tests for process_package_lock_lockfile_v2 (package-lock.json v2 parsing).
• Python Parser:
  • Tested run_checker in PythonRequirementsParser for subprocess errors.
  • Tested run_checker in PythonParser for invalid METADATA/PKG-INFO handling.

---

Testing:

• All tests pass successfully via pytest.
• Ensures key parsing logic is correctly validated.

[terriko]

I believe with the current Github Actions config, these will wind up running every time, when most of our language parsers run tests only in the longtest job. I've kicked off the tests to actually run so we can get some time data before we decide the best path: it probably makes conceptual better sense to group them with the other parser tests, but if they're fast enough maybe running them for every version of python would be fine.

[JigyasuRajput]

I believe with the current Github Actions config, these will wind up running every time, when most of our language parsers run tests only in the longtest job. I've kicked off the tests to actually run so we can get some time data before we decide the best path: it probably makes conceptual better sense to group them with the other parser tests, but if they're fast enough maybe running them for every version of python would be fine.

Hey! @terriko,
Thanks for the follow-up!
I agree with you, should I include these into the long tests?

[terriko]

Doesn't look like any of these made it into the top 50 slowest tests according to the logs I looked at (I admit, I didn't look at every single version of python). So I think we'll leave them as is rather than shunting them off with the slower tests.

Thanks for working on this; let's get it merged!