test_runner: fix passing `expectFailure` #2787

Job	Run time
Build slim tarball	1m 28s
aarch64-darwin: with shared libraries	2h 37m 53s
aarch64-linux: with shared libraries	1h 28m 17s
x86_64-linux: with shared libraries	2h 4m 49s
x86_64-darwin: with shared libraries	1h 43m 54s
	7h 56m 21s

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