test: fix coverage ci #719

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	6m 8s
test (x86_64-unknown-linux-gnu, nightly)	7m 28s
test (aarch64-unknown-linux-gnu, stable)	2m 35s
test (aarch64-unknown-linux-gnu, nightly)	2m 54s
test (armv7-unknown-linux-gnueabihf, stable)	2m 35s
test (armv7-unknown-linux-gnueabihf, nightly)	2m 42s
test (riscv64gc-unknown-linux-gnu, stable)	2m 23s
test (riscv64gc-unknown-linux-gnu, nightly)	2m 49s
test (s390x-unknown-linux-gnu, stable)	2m 37s
test (s390x-unknown-linux-gnu, nightly)	2m 41s
test (x86_64-apple-darwin, stable)	2m 0s
test (x86_64-apple-darwin, nightly)	1m 54s
test (aarch64-apple-darwin, stable)	3m 57s
test (aarch64-apple-darwin, nightly)	4m 24s
test (x86_64-pc-windows-gnu, stable)	4m 51s
test (x86_64-pc-windows-gnu, nightly)	3m 29s
test (x86_64-pc-windows-msvc, stable)	7m 51s
test (x86_64-pc-windows-msvc, nightly)	6m 31s
test (i686-pc-windows-gnu, stable)	7m 34s
test (i686-pc-windows-gnu, nightly)	6m 40s
test (i686-pc-windows-msvc, stable)	4m 2s
test (i686-pc-windows-msvc, nightly)	3m 17s
	1h 31m 22s

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