ADB Install Fails With INSTALL_FAILED_TEST_ONLY

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Looks like you need to modify your AndroidManifest.xml
Change android:testOnly="true" to android:testOnly="false" or remove this attribute.

If you want to keep the attribute android:testOnly as true you can use pm install command with -t option, but you may need to push the apk to device first.

$ adb push bin/hello.apk /tmp/
5210 KB/s (825660 bytes in 0.154s)

$ adb shell pm install /tmp/hello.apk 
    pkg: /tmp/hello.apk
Failure [INSTALL_FAILED_TEST_ONLY]

$ adb shell pm install -t /tmp/hello.apk 
    pkg: /tmp/hello.apk
Success

I was able to reproduce the same issue and the above solved it.

If your APK is outside the device (on your desktop), then below command would do it:

$ adb install -t hello.apk

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