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prefer_void_to_null in flutter_test (#22847)

* prefer_void_to_null in flutter_test

* fix CI
A
Alexandre Ardhuin committed
0e76cb4c10b90ebf42b904d3d93dd07ac0305d37
Parent: dba5431
Committed by GitHub <noreply@github.com> on 10/11/2018, 4:00:46 PM