Add extra tests. #2990

Job	Run time
rustfmt-clippy	28s
msrv	50s
docs	24s
minimal	10s
test-expectations (ubuntu-latest)	48s
quickchecking	12s
test-expectations (macos-latest)	1m 0s
check-cfg	21s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 41s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 39s
test-book	14s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 39s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 35s
test-no-headers	28s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 11s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 7s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 6s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 8s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	4m 13s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	4m 5s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	3m 59s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	3m 59s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	5m 22s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	5m 24s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	9m 24s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	5m 8s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 30s
test (macos-latest, 16.0, 0, 0, 0)	2m 52s
success	1s
	1h 6m 58s

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