tests: add base tests for commands

[michalsn]

Description This PR adds basic tests for commands.

Checklist:

• [x] Securely signed commits
• [ ] Component(s) with PHPDoc blocks, only if necessary or adds value
• [x] Unit testing, with >80% coverage
• [ ] User guide updated
• [x] Conforms to style guide

[michalsn]

If anyone has an idea what is going on with rector, I would appreciate any hint.

Locally everything is passing on my machine 🤷‍♂️

[michalsn]

This is rather a temporary solution. Thanks to @kenjis we already have very good Mocking for CLI: https://github.com/codeigniter4/CodeIgniter4/blob/4.5/system/Test/Mock/MockInputOutput.php, but it will be released with v4.5.

[lonnieezell]

Ah, ok, nice! I missed that one.

[kenjis]

@michalsn

Installing rector/rector (0.15.25): Extracting archive

The version is too old.