test

Fixed wrong name of environmental variable #706

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (ubuntu-latest, 2.3)	44s
test (ubuntu-latest, 2.4)	42s
test (ubuntu-latest, 3.2)	20s
test (ubuntu-latest, head)	18s
test (ubuntu-latest, 2.5)	44s
test (ubuntu-latest, 3.1)	17s
test (ubuntu-latest, 3.0)	18s
test (ubuntu-latest, 3.4)	16s
test (ubuntu-latest, 2.6)	46s
test (ubuntu-latest, jruby)	3m 35s
test (ubuntu-latest, jruby-head)	4m 14s
test (ubuntu-latest, 3.3)	20s
test (windows-latest, 2.5)	2m 47s
test (windows-latest, 2.4)	2m 3s
test (ubuntu-latest, truffleruby)	52s
test (ubuntu-latest, 2.7)	46s
test (windows-latest, 2.3)	1m 58s
test (windows-latest, 2.6)	3m 16s
test (windows-latest, 3.0)	1m 50s
test (windows-latest, 3.1)	1m 27s
test (windows-latest, 2.7)	3m 5s
test (windows-latest, head)	2m 4s
test (windows-latest, 3.3)	1m 13s
test (windows-latest, 3.2)	1m 26s
test (windows-latest, 3.4)	1m 47s
	37m 12s

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