Fix for mocking final classes in some instrumented tests

[paulkagiri]

This PR is meant to address failures noted in the instrumented tests. The failures were happening because Mockito does not allow mocking final classes and thus a workaround has been arrived where a custom PackageInfo and respective SigningInfo has been developed.

Depends on: AzureAD/microsoft-authentication-library-common-for-android#1454

[iambmelt]

Grabbing a snapshot of the failing tests, since builds aren't long-term archived

2021-05-04T20:36:35.8361958Z com.microsoft.aad.adal.AuthenticationContextTest > testAcquireTokenByRefreshTokenConnectionNotAvailable[test(AVD) - 11] �[31mFAILED �[0m
2021-05-04T20:36:35.8363361Z 	java.lang.AssertionError: Connection related error code expected:<DEVICE_CONNECTION_IS_NOT_AVAILABLE> but was:<AUTH_REFRESH_FAILED>
2021-05-04T20:36:35.8364432Z 	at org.junit.Assert.fail(Assert.java:88)

2021-05-04T20:37:13.3385788Z com.microsoft.aad.adal.DiscoveryTests > testValidateAuthorityFailedWithoutNetwork[test(AVD) - 11] �[31mFAILED �[0m
2021-05-04T20:37:13.3387226Z 	java.lang.AssertionError
2021-05-04T20:37:13.3387861Z 	at org.junit.Assert.fail(Assert.java:86)

2021-05-04T20:37:13.5367953Z com.microsoft.aad.adal.FileTokenCacheStoreTests > testWriteFileException[test(AVD) - 11] �[31mFAILED �[0m
2021-05-04T20:37:13.5369706Z 	java.lang.NullPointerException: tag is marked non-null but is null
2021-05-04T20:37:13.5370599Z 	at com.microsoft.identity.common.java.logging.Logger.error(Logger.java:171)

2021-05-04T20:37:14.9369258Z com.microsoft.aad.adal.LoggerTest > testCallbackThrowsError[test(AVD) - 11] �[31mFAILED �[0m
2021-05-04T20:37:14.9370322Z 	java.lang.NullPointerException: tag is marked non-null but is null
2021-05-04T20:37:14.9371126Z 	at com.microsoft.identity.common.java.logging.Logger.verbose(Logger.java:332)

2021-05-04T20:37:20.0364080Z com.microsoft.aad.adal.LoggerTest > testCallbackNullMessages[test(AVD) - 11] �[31mFAILED �[0m
2021-05-04T20:37:20.0364984Z 	java.lang.NullPointerException: tag is marked non-null but is null
2021-05-04T20:37:20.0365606Z 	at com.microsoft.identity.common.java.logging.Logger.info(Logger.java:280)

2021-05-04T20:37:23.6374232Z com.microsoft.aad.adal.PackageHelperTests > testGetCurrentSignatureForPackage[test(AVD) - 11] �[31mFAILED �[0m
2021-05-04T20:37:23.6375269Z 	java.lang.AssertionError: should be same info expected:<lL7Wg+FHYAV2pyuhm5vyJayWJqE=> but was:<null>
2021-05-04T20:37:23.6376048Z 	at org.junit.Assert.fail(Assert.java:88)

2021-05-04T20:37:29.7392776Z > Task :adal:connectedLocalDebugAndroidTest FAILED
2021-05-04T20:37:29.7393445Z :adal:connectedLocalDebugAndroidTest (Thread[Daemon worker,5,main]) completed. Took 2 mins 46.892 secs.
2021-05-04T20:37:29.7395112Z 
2021-05-04T20:37:29.7395684Z Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
2021-05-04T20:37:29.7397055Z Use '--warning-mode all' to show the individual deprecation warnings.
2021-05-04T20:37:29.7398017Z See https://docs.gradle.org/6.7.1/userguide/command_line_interface.html#sec:command_line_warnings
2021-05-04T20:37:29.7398694Z 58 actionable tasks: 58 executed
2021-05-04T20:37:29.7399059Z 
2021-05-04T20:37:29.7399450Z FAILURE: Build failed with an exception.
2021-05-04T20:37:29.7399773Z 
2021-05-04T20:37:29.7400105Z * What went wrong:
2021-05-04T20:37:29.7401068Z Execution failed for task ':adal:connectedLocalDebugAndroidTest'.
2021-05-04T20:37:29.7401902Z > There were failing tests. See the report at: file:///home/gradle/adal/build/reports/androidTests/connected/flavors/localDebugAndroidTest/index.html
2021-05-04T20:37:29.7402530Z 
2021-05-04T20:37:29.7402861Z * Try:
2021-05-04T20:37:29.7403913Z Run with --stacktrace option to get the stack trace. Run with --debug option to get more log output. Run with --scan to get full insights.
2021-05-04T20:37:29.7404588Z 
2021-05-04T20:37:29.7405204Z * Get more help at https://help.gradle.org
2021-05-04T20:37:29.7405651Z 
2021-05-04T20:37:29.7406023Z BUILD FAILED in 7m 33s
2021-05-04T20:39:29.2219200Z ##[error]Bash exited with code '1'.
2021-05-04T20:39:29.2252178Z ##[section]Finishing: Build and test inside docker container
``

[iambmelt]

License files

[iambmelt]

More or less, these changes seem fine - the tests broken in #1587 seem to be resolved. Let's fix the license declarations in these files, resolve the submodule conflict and send it round for another signoff

[paulkagiri]

testGetCurrentSignatureForPackage is also failing because of #1587 but after spending countless hours trying to fix it, am suspending my investigations for now to pick up the other pending work.

[shahzaibj]

I think we should update the description here because as I understand there were really a couple of issues:

• Mocking of final classes
• Accessing inaccessible classes located in androidTest of common and trying to use those in tests in ADAL

I think this PR addresses both of those issues and we should call that out.

[rpdome]

left a minor feedback

[shahzaibj]

If we can make the pipeline pass...then I can approve it

[rpdome]

@paulkagiri this is blocking my PR, could we get this fixed and merge? Thanks!

[rpdome]

@paulkagiri . I disabled the tests for now, but we should definitely get this up and running by end of month.

[AdamBJohnsonx]

minor comment

Already addressed the requested changes