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Adjust and refactor all `MaterialButton` tests into its respective file (#43528)

* Adjust and refactor all MaterialButton tests into its respective file
T
Taufiq Rahman committed
13c4ba2a253db50a03a33f2ced470bdfa15fa653
Parent: e091d72
Committed by Shi-Hao Hong <shihaohong@google.com> on 10/29/2019, 9:27:07 PM