Environment Information

Provide at least:

• JRuby version: jruby-9.4.6.0
• Operating system and platform: ubuntu-latest and macOs on GitHub Actions

Expected Behavior

• Coverage library will cover begin clause

Actual Behavior

• Coverage library doesn't cover begin clause
• See https://app.codecov.io/gh/okuramasafumi/alba/commit/5abda13479a0d3ac25758c8b4aa1f4848828286c/blob/lib/alba.rb

Additional info

I noticed that after adding jruby to GitHub Actions matrix, the coverage percentage slightly get down. It seems coverage library doesn't cover begin clause.
CRuby does cover, so I believe JRuby could behave the same.