Fix usage of assure #12300

Job	Run time
doctest (1.9, ubuntu-latest)	31m 16s
doctest (~1.10.0-0, ubuntu-latest)	21m 24s
test (1.6, short, ubuntu-latest)	53m 32s
test (1.6, long, ubuntu-latest)	38m 59s
test (1.9, short, ubuntu-latest)	55m 45s
doctest (nightly, ubuntu-latest)	7m 5s
test (1.9, long, ubuntu-latest)	36m 28s
doctest (1.9, ubuntu-latest, depwarn=error)	30m 0s
test (~1.10.0-0, short, ubuntu-latest)	42m 0s
doctest (1.9, macOS-latest)	2h 21m 9s
test (~1.10.0-0, long, ubuntu-latest)	30m 21s
test (nightly, short, ubuntu-latest)	7m 55s
test (nightly, long, ubuntu-latest)	7m 50s
test (1.9, ubuntu-latest, short, depwarn=error)	55m 22s
test (1.9, ubuntu-latest, long, depwarn=error)	35m 36s
test (nightly, macOS-latest)	13m 42s
	10h 8m 24s

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