This app tests the signature spoofing capability of your Android OS as required by the <a href="https://microg.org/">microG Project</a>. It attempts to fake its own signature and reports whether it succeeds. Simply launch the app to see the result of the test. You can find more information about signature spoofing <a href="https://github.com/microg/android_packages_apps_GmsCore/wiki/Signature-Spoofing">here</a>.