testing a composite action with act

[askb]

I'm trying to run composite action test with nektos/act, however some inputs are expected and there does not seem to be any docs. Is there a readme or docs on what inputs are required for test run locally with the latest nektos/act?

Maybe I'm missing some steps.

$ gh act -s GITHUB_TOKEN="$(gh auth token)" -j reusable_workflow_job
...
[reusable/reusable_workflow_job]   🐳  docker exec cmd=[bash --noprofile --norc -e -o pipefail /var/run/act/workflow/0] user= workdir=
| inputs.string_required=
[reusable/reusable_workflow_job]   ❌  Failure - Main test required string