Corona test result fetching, storage & wiring (EXPOSUREAPP-6007)

[d4rken]

• This PR replaces the mix of SharedPreference properties used to store the data related to the current PCR test with a CoronaTestRepository that allows to work with implementations of CoronaTest.
• Each CoronaTest has a CoronaTestProcessor that hides the test specific actions
• Any test related actions are performed via the repository, access to the current test data is only possible via Flow<Set<CoronaTest>> to allow threadsafe observation from various areas of the app.
• CoronaTestMigration will take the old data and construct a data class PCRTest : CoronaTest out of it, after that has been stored in the new CoronaTestStorage the old attributes are deleted.
• The tests themselves are stored in memory via a HotDataFlow<Set<CoronaTest>>. This flow is observed and on every data change a new snapshot of the data classes is serialized and persisted. The last snapshots is loaded from storage and used to initialize HotDataFlow if our app is killed.
• On migration of old data, the user may see the app refreshing the tests for a short moment or PENDING if there is no internet until we were able to determine the current test result state for the migrated test data.

• Unit tests for migration
• Unit tests for processors
• Unit tests for repo
• Unit tests for storage
• Implement State determination within new test data classes
• Refactor remaining access to old test attributes
• Implement specific repository methods for updating test properties (viewed/consent etc)

[mtwalli]

In general looks good , I like the separation for handling test lifecycle

[mtwalli]

I got a crash while registering a test:

2021-04-16 11:58:09.770 27053-27144/de.rki.coronawarnapp.test E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-12 @coroutine#874
    Process: de.rki.coronawarnapp.test, PID: 27053
    java.lang.IllegalStateException: No test of type PCR available
        at de.rki.coronawarnapp.submission.SubmissionRepository$giveConsentToSubmission$1.invokeSuspend(SubmissionRepository.kt:50)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)

[d4rken]

I got a crash while registering a test:

Currently expected, test registration will only work after additional PRs from other team members.
Because some data (like consent) is stored "per test", we need to forward the data until we can actually create the test (with QR Code).

I can make it not crash, but I think it does not matter, because it will not be able to register a test until PRs from @chiljamgossow @axelherbstreith and @SamuraiKek are merged.

[SamuraiKek]

I can make it not crash, but I think it does not matter, because it will not be able to register a test until PRs from @chiljamgossow @axelherbstreith and @SamuraiKek are merged.

I'm not sure if my PR would need to be merged for this to work. I think I would actually need to be able to register a test in order to test my PR.

[d4rken]

I fixed the crashes, and registering a PCR test will now work, consent is hardcoded for now, this will be fixed by @SamuraiKek .
Also fixed an issue with storing the tests, and a collision between stableIds on the homescreen.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
32 Code Smells

17.9% Coverage
3.6% Duplication