BUG: module.__name__ not set set correctly during exec in test collection

[NickCrews]

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of pytask.
• (optional) I have confirmed this bug exists on the main branch of pytask.

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Problem description

First of all, thanks for this library! A lot of great stuff in here.

See #373 for a PR that adds a failing test.

While I'm not sure what the root cause is / who's fault it is, the actual method of failure is something like this:
Say I have a file task_a.py. In

pytask/src/_pytask/collect.py

Lines 108 to 120 in 9b2d93e

	@hookimpl
	def pytask_collect_file(
	session: Session, path: Path, reports: list[CollectionReport]
	) -> list[CollectionReport] | None:
	"""Collect a file."""
	if any(path.match(pattern) for pattern in session.config["task_files"]):
	spec = importlib_util.spec_from_file_location(path.stem, str(path))
	if spec is None:
	raise ImportError(f"Can't find module {path.stem!r} at location {path}.")
	mod = importlib_util.module_from_spec(spec)
	spec.loader.exec_module(mod)

, the module spec is created with a module name of path.stem, so in my case it is task_a. But then IFF you have used a from __future__ import annotations, then you go down this code path where dataclasses tries to call sys.modules.get("task_a"), and "task_a" is not importable by itself.

I think we need to be setting the module.name to something else, so it actually is findable within sys.modules, or import/exec it slightly differently?

Expected Output

[tobiasraabe]

Hi @NickCrews, thanks for the kind words, and thank you for the bug report + test 🙇.

This seems tricky. I hopefully have some time over the weekend to look into this. My current guess is that the import mechanism is not doing enough, and maybe it needs some of the sys.path modification magic pytest is doing. Here for future investigations:

• import_path
• How import_path is used

[NickCrews]

That looks like it would fix the problem, but I'm not sure which importmode should be used. pytests docs on the subject