robolectric/src/test/resources/res/mipmap/robolectric_xml.xml

<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
  <background>
    <bitmap android:src="@mipmap/robolectric"/>
  </background>
  <foreground>
    <bitmap android:src="@mipmap/robolectric"/>
  </foreground>
</adaptive-icon>