Test

Refine code. #132

Job	Run time
multiple-arch-aarch64	22m 0s
multiple-arch-armv7	20m 37s
cygwin64-cache	1m 35s
utest-regression-blackbox-test	9m 23s
fast	3s
cygwin64	14m 59s
build-centos7	5m 7s
build-cross-aarch64	5m 15s
build-cross-arm	5m 38s
build-ubuntu16	3m 31s
build-ubuntu18	3m 17s
build-ubuntu20	3m 37s
coverage	3m 37s
multiple-arch-amd64	2m 43s
test-done	1s
	1h 41m 23s

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