test

Document implicit file tasks #891

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (ubuntu-latest, 3.0)	19s
test (ubuntu-latest, 2.3)	44s
test (ubuntu-latest, 2.6)	49s
test (ubuntu-latest, head)	17s
test (ubuntu-latest, 2.4)	42s
test (ubuntu-latest, 3.3)	18s
test (ubuntu-latest, 3.1)	17s
test (macos-latest, 3.1)	18s
test (macos-latest, 2.6)	1m 3s
test (ubuntu-latest, 2.5)	43s
test (ubuntu-latest, 4.0)	21s
test (ubuntu-latest, 3.2)	18s
test (macos-latest, 3.0)	23s
test (ubuntu-latest, 3.4)	18s
test (macos-latest, jruby)	4m 43s
test (windows-latest, 2.5)	2m 39s
test (macos-latest, truffleruby)	36s
test (ubuntu-latest, 2.7)	50s
test (ubuntu-latest, truffleruby)	51s
test (macos-latest, 2.7)	1m 19s
test (windows-latest, 3.1)	1m 50s
test (macos-latest, 3.3)	20s
test (macos-latest, 4.0)	19s
test (windows-latest, 3.2)	1m 16s
test (macos-latest, 3.4)	15s
test (ubuntu-latest, jruby)	4m 13s
test (windows-latest, head)	1m 36s
test (windows-latest, 4.0)	1m 52s
test (windows-latest, 2.7)	2m 18s
test (windows-latest, 3.3)	1m 44s
test (windows-latest, 2.6)	2m 28s
test (windows-latest, 3.0)	1m 14s
test (macos-latest, 3.2)	17s
test (windows-latest, 3.4)	1m 43s
test (windows-latest, 2.4)	1m 58s
test (macos-latest, head)	16s
	41m 31s

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