Tests

add to color scheme #68

Job	Run time
test (ubuntu-latest, head)	10s
test (ubuntu-latest, 3.3)	8s
test (ubuntu-latest, 3.2)	16s
test (ubuntu-latest, 3.1)	12s
test (ubuntu-latest, 3.0)	11s
test (ubuntu-latest, jruby)	49s
test (ubuntu-latest, jruby-head)	42s
test (ubuntu-latest, truffleruby)	26s
test (ubuntu-latest, truffleruby-head)	26s
test (ubuntu-latest, truffleruby+graalvm)	1m 25s
test (windows-latest, head)	59s
test (windows-latest, 3.3)	2m 16s
test (windows-latest, mingw)	57s
test (windows-latest, mswin)	1m 3s
test (windows-latest, ucrt)	1m 4s
test (macos-latest, head)	15s
test (macos-latest, 3.3)	13s
	11m 32s

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