Make the RubyGems test suite green under RUBY_BOX=1 - #9826

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hsbt wants to merge 7 commits into

ruby-box-green-round1

Commits on Aug 28, 2026

Suppress the Ruby::Box experimental warning in test subprocesses
hsbt
committed
90a1b02
Use Process.last_status instead of $?
hsbt
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2d973cd
Pend tests that capture stdio under Ruby::Box
hsbt
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9820152
Pend Marshal round-trip tests under Ruby::Box
hsbt
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c47987f
Pend RDoc tests under Ruby::Box
hsbt
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1e3d1f8
Preload rdoc before faking Gem paths in TestGemRDoc
hsbt
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09583db
Add a RUBY_BOX=1 CI lane on ruby-head
hsbt
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a72ffc1