Tests

add to color scheme #66

Job	Run time
test (ubuntu-latest, head)	1m 12s
test (ubuntu-latest, 3.3)	1m 20s
test (ubuntu-latest, 3.2)	1m 22s
test (ubuntu-latest, 3.1)	1m 16s
test (ubuntu-latest, 3.0)	1m 7s
test (ubuntu-latest, jruby)	44s
test (ubuntu-latest, jruby-head)	41s
test (ubuntu-latest, truffleruby)	1m 42s
test (ubuntu-latest, truffleruby-head)	1m 47s
test (ubuntu-latest, truffleruby+graalvm)	3m 28s
test (windows-latest, head)	1m 35s
test (windows-latest, 3.3)	3m 19s
test (windows-latest, mingw)	1m 39s
test (windows-latest, mswin)	1m 24s
test (windows-latest, ucrt)	1m 37s
test (macos-latest, head)	55s
test (macos-latest, 3.3)	57s
	26m 5s

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