A renamed JNI callback does not fail the build — it produces a release APK
that aborts on the first callback of every test. That shipped once, because
every on-device check used the debug build, which does not minify.
This reads R8's own mapping file for the classes and callback methods, and the
DEX string pool for the native entry points. Native methods are deliberately
not checked against mapping.txt: R8 only emits entries for members with a body
or a rename, so a native method is absent either way and absence would prove
nothing.
Verified by deleting the callback keep rules and rebuilding: the check reports
MainThreadCallback renamed along with onOutput, onError and onComplete, which
is exactly the failure that shipped — with no device involved.
Also avoids `... | strings | grep -q` and dumps to a file first. Under
`set -o pipefail`, grep -q exits at the first match and SIGPIPEs strings, so
the pipeline reports failure for a name found early and success for one found
late. It reported two of four names missing while all four were present.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
