In a poetry plugin command handler, my calls to the run command are failing but same call from the command line works fine

[ileslie]

I am creating a plugin for poetry meant to help implement our workflow. In my custom command handler I need to call several poetry commands.

The call to the poetry check command works fine:

def handle(self) -> int:
    ...
    # call poetry command check
    self.call("check", "--lock")
    ...
    self.call("run", "pytest --junit-xml=\"/path_to_location_for_test_reports/all_tests.xml\"")

However the call the to the poetry run command does not.
It fails with:

Running unit tests...
pytest --junit-xml="/path_to_location_for_test_reports/all_tests.xml"

The option "--junit-xml" does not exist

Looking at the code it seems like the processing in the call validates the arguments as parameters to the poetry run command which of course does not have one named --junit-xml. However that is not an argument for the poetry run command it is an argument for the pytest command.

I can run this on the command line:

poetry run pytest --junit-xml="/path_to_location_for_test_reports/all_tests.xml"
==================================== test session starts ========================================
platform linux -- Python 3.13.2, pytest-8.3.5, pluggy-1.5.0
rootdir: /project_root
configfile: pyproject.toml
plugins: anyio-4.9.0
collected 0 items                                                                                                                                

----------------- generated xml file: /path_to_location_for_test_reports/all_tests.xml ------------------
===================================== no tests ran in 0.01s ======================================

Yes, I have no tests in the sample project. No, having a test doesn't change anything - other than they run when I type the command on the command line.