Disable 'testOnly' mode for Android Studio 3.0

Android Studio 3.0 sets android:testOnly="true" automatically on APKs that are ran from the IDE.

However, for some devices (such as OPPO R11), the test-only APKs can never be installed …

If you face the same problem, try add this line to your ‘/gradle.properties’:

# gradle.properties
android.injected.testOnly=false

Then the boring android:testOnly attribute disappears. ( ͡° ͜ʖ ͡°)✧

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