Avoid reinstalling injected package without --force

[huxuan]

• I have added a news fragment under changelog.d/ (if the patch affects the end users)

Summary of changes

Fix #1300

Test plan

Tested by running

> pipx install pycowsay
  installed package pycowsay 0.0.0.2, installed using Python 3.10.12
  These apps are now globally available
    - pycowsay
  These manual pages are now globally available
    - man6/pycowsay.6
done! ✨ 🌟 ✨
> pipx inject pycowsay cowsay
  injected package cowsay into venv pycowsay
done! ✨ 🌟 ✨
> pipx inject pycowsay cowsay
cowsay already seems to be injected in 'pycowsay'. Not modifying existing installation in '/usr/local/pipx/venvs/pycowsay'. Pass '--force' to force installation.
> pipx inject pycowsay cowsay --force
  injected package cowsay into venv pycowsay
done! ✨ 🌟 ✨

[chrysle]

Looks like you need to fix a test..

[huxuan]

Looks like you need to fix a test..

Sorry for the test broken, I should test it locally.

The test case try to inject isort into pylint [1] but actually isort is already a dependency of pylint [2], that is why isort is not injected. So maybe I should change the test case? Since the injection is meaningless.

[1]

pipx/tests/test_list.py

Line 97 in ac70dc0

assert not run_pipx_cli(["inject", "pylint", PKG["isort"]["spec"]])

[2] https://github.com/pylint-dev/pylint/blob/10a093ea85f8cb2a3268f439c3b1f40319023956/pyproject.toml#L45

[huxuan]

Hi @chrysle, I fixed the test by changing isort to black, all local tests passed. PTAL :-)

[chrysle]

Thank you!