Question: A void method increaseVolume ( ) that takes no parameter and increases m _ volume by 1 . A void method decreaseVolume ( ) that

A void method increaseVolume() that takes no parameter and increases m_volume by 1.
A void method decreaseVolume() that takes no parameter and decreases m_volume by 1.
Build a test driver by creating a class TestPhone to test the functionality of the class Phone.

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