Add tests for commands

[christiansiegel]

Add unit tests for every command..
..so that bugs like #80 don't happen anymore 😬

[christiansiegel]

deploy command tests: PR #94

[joachimprinzbach]

Missing command tests:

• add_pr_comment
• create_pr_preview
• create_preview
• delete_pr_preview
• sync_apps

[christiansiegel]

add_pr_comment: PR #120
delete_pr_preview: PR #118

[christiansiegel]

sync_apps: PR #125

still missing:

• create_pr_preview
• create_preview

[christiansiegel]

🎉 This issue has been resolved in version 4.2.2 🎉

The release is available on:

• v4.2.2
• GitHub release

Your semantic-release bot 📦🚀