Fix tests #306

Job	Run time
documentation (windows)	3m 23s
fmt (windows)	31s
fmt (ubuntu)	21s
cross (beta, armv7-unknown-linux-gnueabihf)	2m 2s
cross (beta, aarch64-unknown-linux-gnu)	1m 59s
documentation (ubuntu)	1m 33s
clippy (windows)	1m 52s
test (beta, x86_64-unknown-linux-gnu, 10.0)	3m 29s
clippy (ubuntu)	45s
test (beta, x86_64-unknown-linux-gnu, 8.0)	3m 42s
test (beta, x86_64-pc-windows-msvc, 10.0)	5m 45s
test (beta, x86_64-pc-windows-msvc, 8.0)	4m 44s
test (beta, aarch64-apple-darwin, 10.0)	2m 50s
test (beta, i686-pc-windows-msvc, 8.0)	5m 12s
examples (beta, run-app-with-args)	1m 14s
examples (beta, return-string-from-managed)	1m 10s
test (beta, aarch64-apple-darwin, 9.0)	3m 2s
test (beta, x86_64-pc-windows-msvc, 9.0)	4m 43s
test (beta, i686-pc-windows-msvc, 9.0)	4m 58s
examples (beta, call-managed-function)	1m 4s
examples (beta, passing-parameters)	58s
examples (beta, run-app)	1m 13s
test (beta, x86_64-unknown-linux-gnu, 9.0)	2m 39s
test (beta, i686-pc-windows-msvc, 10.0)	5m 21s
test (beta, aarch64-apple-darwin, 8.0)	2m 2s
	1h 6m 32s

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