Make ProGuard keep @VisibleForTesting classes and methods

    java.lang.Class class$(java.lang.String, boolean);

}

# Keep classes and methods that have the guava @VisibleForTesting annotation

-keep @com.google.common.annotations.VisibleForTesting class *

-keepclassmembers class * {

@com.google.common.annotations.VisibleForTesting *;

}

# Please specify classes to be kept explicitly in your package's configuration.

# -keep class * extends android.app.Activity

# -keep class * extends android.view.View