Functional tests

Makes failure more clear at UTF-8 decoding error #4399

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Run time

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Job	Run time
C++	2m 11s
Swift on Linux	4m 6s
Android	5m 12s
Swift on MacOS	9m 58s
Dart	2m 39s
CMake toolchain tests	5m 52s
Dart with AddressSanitizer	2m 27s
	32m 25s