This patch adds an initial set of UI tests for Aegis built using Espresso. It
covers a fair bit of the essential functionality of the app, but there are lots
more tests we could add later on.
This also reconfigures our Travis CI build manifest to run the tests on API 21,
23, 27 and 28 emulators. It was a real pain to get this to work well, but let's
hope it's stable now.
I had to downgrade ``com.google.android.material`` to 1.0.0, because 1.1.0
introduced an issue where the test would hang.
SpongyCastle is a fork of BouncyCastle. We originally used this fork to 1) have
access to scrypt and 2) prevent a package name collision with the bundled
BouncyCastle. We don't actually need to use the fork anymore, because the
package name of the bundled BouncyCastle was changed in Android. SpongyCastle
has also gotten quite outdated in recent years.
The built-in version of BouncyCastle is replaced with the one bundled with the
app at runtime, so that we have a recent version even on older Android versions.
This also updates Gradle and the Gradle Android plugin, to fix a build error I
was running into when I added the dependency to BouncyCastle.
This enables some minification and optimization options to shrink the size of
our APK. A release APK would previously be 12 MB in size, but would now be 8.2
MB.
To test, check if *all* of the functionality of the app still works,
particularly parts that refer to dependencies. You'll know if ProGuard broke
something when the app crashes with a ``ClassNotFoundException`` or similar
exception. I think I've covered all of the cases where ProGuard removed too much
in the rule file.
Also, I was curious why our APK had gotten so large to begin with. I did some
digging and found that this is caused by the SQLCipher dependency. The APK
shrinks down to 2.7 MB without it! We should consider whether having support for
importing from Authenticator Plus is worth the extra 5.5 MB in size.
