test

doc: add support for test-unit loader #1022

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (ubuntu-latest, 2.7)	51s
test (ubuntu-latest, 2.3)	48s
test (ubuntu-latest, 2.4)	41s
test (ubuntu-latest, 2.6)	47s
test (ubuntu-latest, 2.5)	45s
test (ubuntu-latest, 3.0)	14s
test (ubuntu-latest, 3.2)	18s
test (ubuntu-latest, 3.4)	17s
test (ubuntu-latest, 3.3)	18s
test (ubuntu-latest, 3.1)	15s
test (ubuntu-latest, 4.0)	18s
test (ubuntu-latest, head)	13s
test (macos-latest, 2.6)	54s
test (macos-latest, 3.1)	17s
test (ubuntu-latest, truffleruby)	46s
test (macos-latest, 2.7)	48s
test (ubuntu-latest, jruby)	4m 5s
test (macos-latest, 3.3)	17s
test (macos-latest, 3.2)	15s
test (macos-latest, 3.0)	18s
test (macos-latest, jruby)	2m 21s
test (macos-latest, 3.4)	16s
test (macos-latest, 4.0)	17s
test (windows-latest, 2.5)	2m 26s
test (windows-latest, 3.1)	1m 6s
test (windows-latest, 3.3)	1m 43s
test (windows-latest, 3.4)	1m 2s
test (windows-latest, 3.2)	1m 20s
test (windows-latest, 2.7)	2m 12s
test (macos-latest, truffleruby)	32s
test (windows-latest, 2.6)	2m 24s
test (windows-latest, 4.0)	1m 15s
test (macos-latest, head)	15s
test (windows-latest, 2.4)	2m 14s
test (windows-latest, 3.0)	1m 6s
test (windows-latest, head)	1m 5s
	35m 2s

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