Tests

add to color scheme #67

Job	Run time
test (ubuntu-latest, head)	18s
test (ubuntu-latest, 3.3)	16s
test (ubuntu-latest, 3.2)	13s
test (ubuntu-latest, 3.1)	12s
test (ubuntu-latest, 3.0)	12s
test (ubuntu-latest, jruby)	39s
test (ubuntu-latest, jruby-head)	43s
test (ubuntu-latest, truffleruby)	28s
test (ubuntu-latest, truffleruby-head)	35s
test (ubuntu-latest, truffleruby+graalvm)	1m 39s
test (windows-latest, head)	1m 2s
test (windows-latest, 3.3)	1m 23s
test (windows-latest, mingw)	1m 0s
test (windows-latest, mswin)	1m 0s
test (windows-latest, ucrt)	57s
test (macos-latest, head)	14s
test (macos-latest, 3.3)	15s
	11m 6s

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