Both ViewModels' cancel() is one line -- activeWorkId?.let(workManager::cancelWorkById) --
and JaCoCo reports every line of both as covered. The only test of either was
SettingsEditsTest's "cancelling with no active job does nothing rather than throwing",
whose own comment names the half it drives: "the null side". The other side had never been
entered, and JoinViewModel.cancel() had no test at all.
So nothing in 584 tests connected the Cancel button to WorkManager. The affordance tests
click TestTags.CANCEL and assert the action fires into a stub; ScreenWiringTest asserts the
action calls viewModel.cancel(). Both halves were pinned and the join between them was not.
No line-level filter could have found this. It takes a method-level read -- mi=11, ci=7,
mb=1, cb=1 on both -- a covered method with an arm nothing takes, which is the second of
the two filters #194 records and the gap that argued for adding it.
The fixture is why this stayed uncovered rather than why it is hard. The test WorkManager
runs on a SynchronousExecutor, so an ordinary request finishes inline: by the time a test
could call cancel(), convert()'s job was already terminal, leaving only the null arm
reachable. setInitialDelay is what TestScheduler honours, so the job sits in ENQUEUED and
the test never releases it. Production never sets a delay, so the request is built by hand
rather than through ConversionWorker.request -- but ENQUEUED at runAttemptCount 0 is a real
state every job passes through, Reattachment.choose ranks it QUEUED, and conversionStateFrom
maps it to Converting(input, 0). The delay changes how long the job stays in a real state,
not which state it is in.
Three tests, and the third is not padding: without it, cancelAllWork() in place of
cancelWorkById(activeWorkId) passes the other two. It asserts the shape rather than the
identity -- exactly one of two queued jobs is cancelled -- because which one the ViewModel
reattached to is the query's business, and Reattachment's ordering notes say queued jobs
are left tied deliberately.
WorkManager's own record is asserted before the screen. The screen alone would be weaker
than it looks: CANCELLED maps to Idle for a reattached job, and Idle is also where a
ViewModel that did nothing whatsoever would sit.
Mutations, both run and both restored:
cancel() -> no-op all three red
cancelWorkById(id) -> cancelAllWork() only the third red
The second is what shows the third test does independent work rather than restating the
first two.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
JMR-devandClaude Opus 5
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