tests: clean up pytest configuration and setup

[filiplajszczak]

This cleans up the current pytest setup before a separate uv follow-up.

It moves the active pytest configuration into pyproject.toml, removes the now-redundant pytest.ini, and drops old manual sys.path mangling from tests that no longer need it once pytest uses pythonpath = src.

While touching test setup, it also does a small cleanup in tests/batcontrol/test_production_offset.py by switching the repeated factory patch setup there to a fixture using pytest-mock.

[Copilot]

Pull request overview

This PR consolidates pytest configuration into pyproject.toml (prepping for a future uv follow-up), removes redundant pytest/sys.path bootstrapping from tests, and refactors one test module to use a shared factory-patching fixture.

Changes:

• Move pytest configuration from pytest.ini into pyproject.toml ([tool.pytest.ini_options]) and delete pytest.ini.
• Remove manual sys.path manipulation from tests now that pytest adds src via pythonpath.
• Refactor tests/batcontrol/test_production_offset.py to use a pytest-mock fixture for repeated factory patch setup.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/conftest.py	Removed now-unneeded global sys.path insertion (file deleted).
tests/batcontrol/test_production_offset.py	Introduced a fixture to patch core factories and reuse a Batcontrol instance in tests.
tests/batcontrol/inverter/test_mqtt_inverter.py	Removed per-file sys.path insertion.
tests/batcontrol/inverter/test_dummy.py	Removed per-file sys.path insertion.
pytest.ini	Removed redundant pytest configuration file.
pyproject.toml	Added pytest ini options under [tool.pytest.ini_options] (incl. pythonpath = ["src"]).

[Copilot]

test_production_offset_initialization_default requests batcontrol_with_patched_factories but then instantiates a new Batcontrol(mock_config) without any factory patching. This bypasses the intended isolation (real provider factories + scheduler thread + refresh_data calls can run) and also spins up an unused extra Batcontrol instance via the fixture. Use the fixture instance for the assertion, or restructure so factory patching happens for the Batcontrol instance created after removing production_offset_percent (e.g., patch factories first, then construct Batcontrol once).