test: test conversion e2e

[lili2311]

• [x] Tests written and linted ℹ︎
• [ ] Documentation written in Wiki/README
• [x] Commit history is tidy & follows Contributing guidelines ℹ︎

What this does

Add more e2e tests ti validate expected behaviour

[aarlaud]

:tada: This PR is included in version 1.6.4 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: