tests: Add mock scenarios for mcp23009e driver.

[nedseb]

Description

The mcp23009e driver has only 5 mock tests, which is low compared to other drivers (hts221: 18, ism330dl: 34, lis2mdl: 15). Add mock tests to improve coverage.

What to do

Add tests to tests/scenarios/mcp23009e.yaml in the mock section.

Methods to test

1. get_iodir() / set_iodir() — read/write IODIR register
2. get_gpio() / set_gpio() — read/write full GPIO port
3. setup() with different configurations — input, output, with pull-up, with polarity inversion
4. set_level() / get_level() — individual pin control
5. get_gppu() — verify pull-up register
6. power_off() / power_on() — verify reset pin toggling

Example test

  - name: "Set IODIR register"
    action: script
    script: |
      dev.set_iodir(0xF0)
      result = dev.get_iodir() == 0xF0
    expect_true: true
    mode: [mock]

Reference

• Driver code: lib/mcp23009e/mcp23009e/device.py
• Existing tests: tests/scenarios/mcp23009e.yaml
• Note: the mock needs a FakePin for reset_pin — check how the existing tests handle it

Checklist

• At least 8 new mock tests added
• pytest tests/ -k "mock and mcp23009e" passes
• Existing tests still pass: pytest tests/ -k mock

[semantic-release-updater]

🎉 This issue has been resolved in version 0.0.2 🎉

The release is available on GitHub release

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