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use isA<Xxx>() matcher (#48482)

A
Alexandre Ardhuin committed
003541499b83c4e5e6d6944a1c164ddd0716df5c
Parent: 5eb394e
Committed by Flutter GitHub Bot <52682268+fluttergithubbot@users.noreply.github.com> on 1/16/2020, 8:43:03 PM