chore: use pytest's new strict mode and fix duplicate tests

[radoering]

No description provided.

[sourcery-ai]

Hey - I've left some high level feedback:

• The pytest configuration in pyproject.toml should likely use the [tool.pytest.ini_options] table (e.g. strict = true under that section) rather than [tool.pytest], otherwise the new strict setting may be ignored by pytest.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The pytest configuration in pyproject.toml should likely use the `[tool.pytest.ini_options]` table (e.g. `strict = true` under that section) rather than `[tool.pytest]`, otherwise the new strict setting may be ignored by pytest.

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