Fix tests #241

Job	Run time
clippy (ubuntu-latest)	40s
cross (beta, aarch64-unknown-linux-gnu)	2m 3s
clippy (windows-latest)	44s
cross (beta, armv7-unknown-linux-gnueabihf)	2m 5s
examples (beta, run-app)	1m 8s
documentation (ubuntu-latest)	1m 30s
examples (beta, run-app-with-args)	49s
cross (beta, aarch64-pc-windows-msvc)	1m 1s
examples (beta, call-managed-function)	53s
fmt (ubuntu-latest)	12s
documentation (windows-latest)	3m 4s
fmt (windows-latest)	27s
examples (beta, passing-parameters)	56s
examples (beta, return-string-from-managed)	57s
test (beta, x86_64-unknown-linux-gnu, 6.0)	2m 40s
test (beta, x86_64-unknown-linux-gnu, 7.0)	2m 52s
test (beta, x86_64-unknown-linux-gnu, 8.0)	2m 56s
test (beta, x86_64-pc-windows-msvc, 6.0)	5m 40s
test (beta, x86_64-pc-windows-msvc, 7.0)	5m 23s
test (beta, x86_64-pc-windows-msvc, 8.0)	5m 50s
test (beta, i686-pc-windows-msvc, 6.0)	6m 21s
test (beta, i686-pc-windows-msvc, 7.0)	5m 44s
test (beta, i686-pc-windows-msvc, 8.0)	5m 58s
test (beta, x86_64-apple-darwin, 6.0)	5m 34s
test (beta, x86_64-apple-darwin, 7.0)	8m 26s
test (beta, x86_64-apple-darwin, 8.0)	4m 23s
	1h 18m 16s

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