lint/cli/src/test/java/com/android/tools/lint/checks/data/res/values/duplicate-strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">App Name</string>
    <string name="hello_world">Hello world!</string>
    <string name="app_name">App Name 1</string>
    <string name="app_name2">App Name 2</string>

</resources>