test

Fixed wrong name of environmental variable #707

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (ubuntu-latest, 2.3)	45s
test (ubuntu-latest, 3.0)	18s
test (ubuntu-latest, 2.4)	45s
test (ubuntu-latest, 2.6)	45s
test (ubuntu-latest, 2.5)	43s
test (ubuntu-latest, 3.2)	20s
test (ubuntu-latest, 3.1)	17s
test (ubuntu-latest, 3.4)	16s
test (ubuntu-latest, jruby-head)	4m 10s
test (ubuntu-latest, head)	16s
test (ubuntu-latest, 3.3)	18s
test (ubuntu-latest, 2.7)	47s
test (windows-latest, 2.4)	1m 56s
test (windows-latest, 3.1)	1m 35s
test (ubuntu-latest, truffleruby)	51s
test (windows-latest, 2.5)	2m 56s
test (windows-latest, 2.6)	3m 9s
test (windows-latest, 2.7)	2m 50s
test (ubuntu-latest, jruby)	3m 26s
test (windows-latest, head)	1m 42s
test (windows-latest, 2.3)	2m 8s
test (windows-latest, 3.0)	1m 52s
test (windows-latest, 3.2)	1m 45s
test (windows-latest, 3.4)	1m 49s
test (windows-latest, 3.3)	1m 14s
	36m 57s

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