Need to mock Log functions

Android Programming (4th Edition) 20. Unit Testing and Audio Playback
1

I added logging in some of the methods I was testing on my ViewModel. In order for the test to run properly, I needed to add the following to build.gradle

android {
    // ...
    testOptions { 
        unitTests.returnDefaultValues = true
    }
}

http://tools.android.com/tech-docs/unit-testing-support#TOC-Method-…-not-mocked.-

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