Backport 27247 (Provide a means of setting the expected success string at run time) #29181
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Backport #27247. NOTE: despite what the GitHub UI says, #27247 actually only has two commits because the one is a subset of 9a66cc2 which was previously merged on earlgrey_1.0.0. So it appears that GH was happy to silently ignore the empty commit when merging.