Ensure that `complete.cff` is validated in the tests. #35

Job	Run time
test-isolated	12s
test-yjit (ubuntu, 3.1)	10s
test (ubuntu, 2.7)	21s
test-yjit (ubuntu, 3.2)	10s
test (ubuntu, 3.0)	7s
test-yjit (ubuntu, 3.3)	7s
test (ubuntu, 3.1)	8s
test-yjit (ubuntu, head)	11s
test (ubuntu, 3.2)	8s
test-yjit (macos, 3.1)	16s
test (ubuntu, 3.3)	7s
test-yjit (macos, 3.2)	13s
test (ubuntu, head)	8s
test-yjit (macos, 3.3)	37s
test (ubuntu, jruby)	41s
test-yjit (macos, head)	13s
test (ubuntu, jruby-head)	40s
test (ubuntu, truffleruby)	27s
test (ubuntu, truffleruby-head)	32s
test (macos, 3.0)	14s
test (windows, 3.0)	1m 8s
finish	0s
	6m 50s

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