Update test script

[pocke]

This PR updates the test scripts system to avoid arbitrary code execution on testing. It is not a security risk for now, but this change is necessary for the new PR merging system I'm constructing.

This PR also includes the following improvements.

• Avoid duplication of _scripts/test
  • Previously, all _scripts/test files had the almost same content.
• Avoid listing dependencies by using the local source of rbs collection.

How

Preivously, _scripts/test files in each gem had testing logic. This PR removed the script and moved the logic to bin/test script.

To avoid code execution, Ruby DSL files (Steepfile and Gemfile) are generated by bin/test script.

I also add metadata.yaml file to declare test dependencies. If the gem has dependencies only for the testing, the user needs to write the dependencies to _test/matadata.yaml file. This file is only for testing, so it does not affect the RBS user.

[pocke]

But, I feel that it would be good to provide guidelines on how to respond to existing PR authors.

@ksss

I'll take over existing PRs. I think I can merge most PRs. If I cannot merge a PR, I'll comment how to treat this change into the individual PR.

I have a suggestion for bin/test: how about putting help message out to help newcomers?

@ybiquitous

Thanks for your suggestion. It looks good! But I'd like to apply this change in another PR after this PR merges. The CI process for this PR is really heavy because the CI runs for all gems on this PR. I'll create a PR with your suggestion. Thanks.

[ybiquitous]

I'll create a PR with your suggestion. Thanks.

Never mind. Glad to hear! 👍🏼