cli: actually test if format_short_change_id() can be parsed

[yuja]

cc @Veykril

Checklist

If applicable:

• [ ] I have updated CHANGELOG.md
• [ ] I have updated the documentation (README.md, docs/, demos/)
• [ ] I have updated the config schema (cli/src/config-schema.json)
• [ ] I have added tests to cover my changes

[Veykril]

Ooh, apologies. I understood the expect message as that the templates were all generally verified on invocation.