test-renderers: sanity check in follow_character_change #342

Job	Run time
miri	1m 48s
build (ubuntu, stable, locked, true)	12m 19s
build (windows, stable, locked, false)	14m 3s
build (macos, stable, locked, false)	31m 17s
build (ubuntu, nightly, locked, false)	13m 44s
no_std	32s
build (ubuntu, beta, locked, false)	12m 37s
build (ubuntu, stable, latest, false)	16m 57s
build (ubuntu, stable, minimal, false)	17m 27s
deploy	4s
fuzz	15m 22s
features	25m 36s
	2h 41m 46s

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