Add several unit test in pytest

[MarkoSagadin]

Description

This PR lays fondation for writing unit tests for east tool.

Areas of interest

Please check files in the tests folder. I am mostly using basic fixtures such as tmp_path, tmp_path_factory, monkeypatch and mocket to create a fake west workspace. The use of this fixtures is quite straightforward once you get past beginner mistakes.

Checklist

• [x] Source code documentation for all newly added or changed functions was added/updated. - [ ] All customer facing technical documentation was updated. (Not relevant)

Related issues

Fixes #27

After-review steps

• Reviewer can merge and delete the branch.

[MarkoSagadin]

Current dependencies on/for this PR:

• dev
  • PR #28 👈
  • PR #30
    • PR #29

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