ConverterScreen.kt:668's null arm -- DetailRow("Container", probe.container?.label ?:
"Unknown") in the VIDEO branch -- had never rendered. Every video case in FileCardTest uses
VIDEO_PROBE, which carries container = MP4.
The argument for adding it is the asymmetry, not the coverage. FileCard renders that exact
expression twice, once in AUDIO_ONLY (:660) and once in VIDEO (:668), and "an audio-only
file nothing else could describe degrades one row at a time" drives only the first. Same
expression, same fallback, one kind covered and one not -- which is the same argument
CLAUDE.md records for including ContainerCapabilities:94.
Nor is null an edge case here. InputProbe.container's own KDoc says MediaExtractor cannot
report a container at all, so it comes from FFprobe alone: any run where FFprobe did not
answer produces exactly this shape -- real codec, real dimensions, real duration, no
container. An empty value in its place would read as a rendering bug rather than as a
probe that got half its sources.
The other three rows are asserted alongside, which is what keeps this from being a copy of
the audio-only case. There, everything is unknown at once; here one field is missing from
a probe that is otherwise complete, and the rest have to be unaffected by it.
Mutation: `?: "Unknown"` -> `?: ""` at :668 only, run and restored. The AUDIO_ONLY twin at
:660 is a separate expression, and mutating that one would redden the existing test instead
-- which would prove nothing about this one.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
audioArgs' Drop arm -- `AudioPlan.Drop -> listOf("-an")` -- was ci == 0. The suite's only
-an assertion lives in "gif generates a palette to avoid banding and drops audio", and that
one comes from the image path at FFmpegCommandBuilder.kt:79/:90, which emits -an directly
and never reaches audioArgs. Two sites, one string, one tested.
It is a live path rather than defensive code. AdvancedPicker renders all of
AudioCodec.entries including NONE, ContainerCapabilities.validate permits audio-off whenever
the input has video, and MKV routes the job to FFmpeg -- so "convert this and drop the
soundtrack" is something a user can do today and nothing had built the command for.
Both halves are asserted, and the second is not padding: -an alone still passes if the arm
falls through to the else and emits an AAC encoder beside the flag, which is a file that is
silent because the flag won while carrying an encoder nobody asked for.
Three mutations, all run and restored. The third is the one that justifies the second
assertion, since the first two break -an as a side effect and so cannot show it:
Drop -> emptyList() red
Drop -> the else arm's aac encoder red (loses -an as well)
Drop -> listOf("-an", "-c:a", "aac") red -- -an intact, caught by assertFalse
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Three sites, all ci == 0 before this, and all the same rule:
work/ConversionWorker.kt:316 cause.message ?: GENERIC_FAILURE_MESSAGE
convert/ConversionViewModel.kt:631 e.message ?: SAVE_FAILED_MESSAGE
join/JoinViewModel.kt:416 e.message ?: SAVE_FAILED_MESSAGE
Every existing test throws WITH a message, so the right-hand side had never been evaluated
anywhere in the suite. A Throwable carrying none is not exotic: RuntimeException(),
IOException() and most platform exceptions raised without an argument all have a null
message, and a native engine that dies is exactly where one comes from.
The worker case needed care, and the care is the reason it survived three waves.
ConversionStateMappingTest's "a failure with nothing said still says something" looks like
it covers that site and does not -- it drives the READ side, map(FAILED, Data.EMPTY), and
that side has a fallback of its own at ConversionViewModel.kt:147-149 which turns a blank
KEY_ERROR back into the same constant. So a test asserting on the resulting Failed state
stays green while the worker's fallback is broken. Measured rather than reasoned: with
:316 mutated to .orEmpty(), exactly ONE of 587 tests went red, and it was the new one.
Everything else, including the test that appears to cover it, stayed green.
So the worker case reads KEY_ERROR off the worker's own Result, before anything downstream
can repair it. The two save cases have no such second line -- both write _state.value
directly -- so the state is the right thing to assert there, and both also assert that
`pending` still travels: a fallback that dropped the handle would leave the file
unreachable from the very screen that just said the save failed.
Held in one class against the ticket's suggestion of three. They are one rule at three
layers, and the masking above has to be explained once rather than three times.
FailedSaveRetryTest already sets the precedent for both ViewModels in one file; this adds
one worker to that shape.
FORCE_SOFTWARE in the worker fixture so the failure comes straight out of runFFmpeg. AUTO
would enter runMedia3OrFallBack, whose catch runs the job a second time in software: the
same exception arrives, but by a path this is not about and which HardwareFallbackTest owns.
Mutations, all run and restored -- each site to .orEmpty(), never to a different constant,
which would only prove the test reads a constant:
ConversionWorker:316 1 of 587 red (this file)
ConversionViewModel:631 red
JoinViewModel:416 red
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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>
ConcatWorker constructed ConcatEngine in place while ConversionWorker reached its engines
through ConversionDependencies. That asymmetry is the whole reason one worker had a tested
failure path and the other had none: everything past setForeground was untested on *every*
source set, JVM and device alike.
The repo had already measured the cost and written it down. PerJobStagingTest's KDoc
records that **reverting ConcatWorker to a constant staging name left all 257 tests
green**, because nothing could reach the line that names the file. RefusedJobTest says it
from the other side -- "the next thing past the count guard is ConcatEngine, which is
native". That mutation is red now.
The seam is `ConversionDependencies.concat: (Context) -> ConcatJoiner`, beside .hardware
and .software. ConcatEngine implements the interface; its Result type stays nested in the
implementation, because moving it would touch every call site to buy nothing -- what a
test needs is the ability to not run FFmpeg, and that is the method, not the type.
Five tests, and the mutations that hold them:
the engine's own reason reaches the user replace e.message with the generic string
a failure with no message still says one drop the ?: GENERIC_FAILURE_MESSAGE fallback
a failed join deletes its partial drop staged.delete() from the catch
no input array at all is refused swap in TOO_FEW_INPUTS_MESSAGE
a join reports its own staged file revert to the constant staging name
The delete test was vacuous on its first draft and the mutation caught it: it scanned the
staging directory for a "join-" prefix that StagingNames.forJob does not produce -- it
names files <jobId>.<ext> -- so the assertion was trivially true. Rewritten to assert
against the handle the joiner was actually given.
Two small fixes ride along, both the repo's own conventions rather than new opinions.
"No input files." becomes NO_INPUTS_MESSAGE, per #158: a message the user can see is
named once, so a test asserts the string the worker writes rather than a copy that can
drift. And the JVM now covers that arm, which ran before staging and before any native
code and had no business being a device test.
579 -> 584 JVM tests, 0 failures.
ConcatWorker: 14 -> 5 missed lines, 2 -> 0 missed branches.
Line 2173/2348 -> 2183/2352; branch 1091/1342 unchanged in the numerator.
The line denominator moved 2348 -> 2352: that is the ConcatJoiner interface, not new
untested code. Said plainly because CLAUDE.md's coverage entry has a history of explaining
its own numbers wrongly.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
probe() runs MediaExtractor and FFprobe independently and merges the two, and every rule
in that merge is a decision nothing held. The reason is structural rather than an
oversight: RemuxTest drives the whole thing on a device against committed fixtures, but
only ever with one probe answering and the other agreeing or also failing. Nothing on any
source set can arrange for a real extractor and a real FFprobe to *disagree*, so every
elvis in the merge was taken in one direction and never the other.
The seam is `internal fun merge(Extracted?, FFprobeInfo?): InputProbe`, pulled out of
probe() whole -- probe() now reads the two probes, merges, and keeps the log. FFprobeInfo
becomes internal alongside it; Extracted already was, with a KDoc giving this exact reason,
and FFprobeInfo simply never got the same treatment. Half a signature being private is
what made the function unnameable from a test.
Eleven tests, and the mutations that hold them:
image beats a real video codec demote the isImage arm below the video arm
the extractor wins on codecs flip the elvis to FFprobe-first
duration is the larger reading replace maxOf with extractor-first
dimensions prefer the extractor flip the width elvis
no recognised stream is unreadable narrow the guard to `extracted == null && info == null`
All five red, then restored. One mutation I tried first was *semantically equivalent* --
moving the image arm above the both-null arm changes nothing for any reachable input -- so
it stayed green and is recorded here rather than counted: a green mutation is only evidence
when the mutation is a real change.
The last row is the arm the ticket was filed for: parsed, and carrying no stream either
probe recognised, which is what a container holding only subtitles looks like. Its input
was already being constructed elsewhere in the suite -- MediaProbeTrackWalkTest calls
extractedFrom(emptyList()) and gets exactly it -- and had never been handed to the merge.
568 -> 579 JVM tests, 0 failures.
MediaProbe: 35 -> 24 missed lines, 72 -> 40 missed branches.
Line 2103/2348 -> 2173/2348; branch 1029/1340 -> 1091/1342.
The branch denominator moved by two, and it is the seam that moved it -- worth stating
separately from the numerator, because CLAUDE.md's coverage entry has a documented history
of explaining its own numbers wrongly.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Two assertion gaps, not coverage gaps, which is why they lasted. AppRootRestorationTest
already drives AppRoot at Compact and Expanded, so JaCoCo is green on useRail -- but it
asserts only that the selected tab survives recreation, through a stub `content`
composable. Nothing anywhere queried for a rail or a bar, and nothing composed the real
screens. Measured before this file existed:
- transposing the NavigationRail and NavigationBar bodies passed the entire suite
- transposing Content's two arms passed it too
A tablet showing phone chrome, or the Convert tab opening the Join screen, and 546 tests
with nothing to say about either. AppRoot's own KDoc is why that matters more than it
looks: from targetSdk 37 the app is resized and rotated whether or not it is ready, so the
width class is not a preference.
WindowWidthSizeClass.Medium appears in no test in either source set today. useRail is
`!= Compact`, so Medium takes the rail; narrowing it to `== Expanded` is one character and
breaks every tablet and unfolded foldable. That mutation is red now, and it is red only
because of the Medium test -- the Compact and Expanded ones both survive it.
Two things this needed:
**createAndroidComposeRule rather than createComposeRule.** Rendering AppRoot with its
default content reaches ConverterScreen's `viewModel = viewModel()`, which needs a
ViewModelStoreOwner. It works because both ViewModels are
`@JvmOverloads constructor(app: Application, ...)` so AndroidViewModelFactory can build
them, and because ui-test-manifest's debugImplementation entry already puts a
ComponentActivity in the merged manifest the unit tests build against -- which
app/build.gradle.kts says in terms. Checked with a throwaway spike before the ticket was
filed, rather than discovered here.
**Two tags, applied inside main.** The only production change: TestTags.Shell, set on the
rail and the bar. There is no other way to tell the two apart -- both render the same two
destinations with the same labels and the same selection state, so any assertion writable
without them is satisfied by either layout. In TestTags and applied by the shell rather
than handed down by the test, for the reason that file's KDoc gives: a tag the test
supplies proves only that the test set it. TagTableUniquenessTest covers the new group.
564 -> 568 JVM tests, 0 failures.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
audioArgs has six arms. Five are named codecs with tests; AAC arrives through the `else`,
so nothing named it -- neither "aac" nor "192k" appeared anywhere in
FFmpegCommandBuilderTest. It is the audio MP4 and M4A get, which is to say the audio the
picker offers first and most conversions produce.
Both halves are asserted, and the bitrate is the half worth arguing for: an -b:a that
quietly changed would fail nothing, look wrong in no command line, and surface only as
files that sound different from the ones the app produced last month. Both mutations
confirmed red -- 192k -> 128k and aac -> libfdk_aac.
Asserted through MP4_H264 and M4A_AAC rather than one of them, so an AAC arm added above
the `else` later has to keep answering the same way for both.
**Deliberately not added here: an ENCODABLE_AUDIO-vs-audioArgs agreement test**, the
obvious companion to VideoCodecMimeAgreementTest. It would freeze the answer to F1, which
is open: ContainerCapabilities.kt:84 says "nothing here emits a Vorbis encoder" and
FFmpegCommandBuilder.kt:188 does. docs/coverage-read-findings.md says in terms that the
tempting fix there locks in the wrong answer and that the decision comes first. This is
the AAC arm only.
563 -> 564 JVM tests, 0 failures. No production code changed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
An assertion gap rather than a coverage one, which is the reason it survived. JaCoCo is
green on build()'s `if (indeterminate)` because ProgressNotificationTest drives it through
a real worker -- but that test reads the notification id and EXTRA_PROGRESS and nothing
else. Nothing had ever read the text. Swapping the two branches passed the whole suite;
so did replacing the caller's title with a constant. Both are red now.
What it costs to get wrong is small and permanent: a conversion four minutes in still
saying "Preparing", or one that has not started reporting yet claiming 0%. Neither is a
crash, and nothing else here would have found it.
Nothing in the suite had constructed ConversionNotifications directly, and the reason
turned out to be mechanical rather than an oversight: build() reaches
WorkManager.getInstance for the Cancel action's PendingIntent, so the notification cannot
be built without one. installTestWorkManager in setUp is the whole fixture, and the KDoc
records the coupling so the next person does not rediscover it.
areEnabled() in the same file is deliberately still untested. It has no caller anywhere in
app/src/main, so a test would assert that a function nobody calls returns what the platform
told it -- and would imply the app handles the disabled-notification case, which it does
not. That is F5 in docs/coverage-read-findings.md, and it asks for a decision rather than a
test.
561 -> 563 JVM tests, 0 failures. No production code changed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Media3Muxers' KDoc names the defect this guards -- "the router claimed five containers
while the engine silently wrote MP4 for all of them" -- and the repair itself was
untested: Media3Engine$buildTransformer$3, the requireNotNull message lambda, was four
lines and four branches at 0%. Nothing had ever driven a plan whose container Media3
cannot mux, and factoryFor answers null for fourteen of them.
Weakening it does not crash. The wrong output is a playable file with the wrong
container, which is why a test rather than a bug report is what would catch it.
Same harness and the same two disciplines as Media3EngineEmptyCompositionTest, which is
the sibling this joins: assert the plan really is the one the test needs before driving
the engine, and rule out CancellationException so an unresumed continuation cannot read
as a pass. Three premises are asserted here rather than assumed -- that the plan is still
WebM by the time the engine sees it, that Media3 really has no muxer for WebM, and that
neither track was dropped, since the empty-composition refusal fires earlier and is a
different test's subject.
The assertion is on the exception type *and* its message, and the ticket predicted why:
replacing requireNotNull with `?: DefaultMuxer.Factory()` does not make the export
succeed, it lets it run on and fail some other way. Measured -- that mutation fails the
type assertion, so the guard is genuinely what this test is holding, and the message
assertion stands behind it.
560 -> 561 JVM tests, 0 failures. No production code changed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
runMedia3OrFallBack was eleven lines at 0% and isCancellation had never been called by any
JVM test -- ci=0, not merely a missed branch. The seam to reach it has existed the whole
time: ConversionDependencies.hardware, which no unit test had ever set. What kept the path
cold is that every worker test uses EnginePreference.FORCE_SOFTWARE, which never enters
the function, and the probe defaults to UNPARSEABLE, which PERMISSIVE.canDecode refuses --
so even AUTO would have routed straight to FFmpeg for a reason no assertion mentioned.
Both are now stated in setUp rather than inherited.
Four behaviours, each with the mutation that proves it:
hardware failure falls back to software delete the fallback call
... on a *clean* staging file delete staged.delete() before it
cancellation is rethrown, not fallen back delete `if (isCancellation(e)) throw e`
engine.close() runs either way empty the finally block
the display-name fallback (#169) change "input" to anything else
All five confirmed red, then restored.
The cancellation one is the reason this ticket was first in the group. runMedia3OrFallBack
catches Throwable, so without that re-throw a user cancelling a hardware transcode has the
app quietly start a *second* conversion in software -- the one thing cancelling is for.
ForcedFailureTest covers the failure half on a device and does not cover this half at all.
The clean-staging assertion is made where it is observable rather than by reading the
file: the software fake records whether the output existed when it was entered, so a
missing delete shows up as FFmpeg finding a half-written hardware output at the path it is
about to write.
556 -> 560 JVM tests, 0 failures. No production code changed.
ConversionWorker: 22 -> 9 missed lines, 14 -> 7 missed branches.
Line 2090/2348 -> 2103/2348; branch 1022/1340 -> 1029/1340.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The ticket asked for two things. One of them is not reachable from the JVM, and saying
so is most of the value here.
**probeForConcat's catch arm cannot be provoked on this runtime.** Robolectric's
MediaExtractor never throws from setDataSource -- measured across four input shapes: an
unregistered content:// authority, a missing file://, a file of garbage bytes, and an
http:// URL. All four returned normally with trackCount = 0. So a failed read arrives as
an empty track list rather than as an exception and reaches the same
ConcatInput(null, null, 0, 0, 0) by the other road. The catch stays covered only by
ConcatEngineTest on a device. The test file says this rather than implying the arm is
handled.
**What is reachable, and was genuinely missing, is the span.** Both halves were already
covered and neither reached the other: MediaProbeTrackWalkTest pins what concatInputFrom
makes of a track list, ConcatPlannerTest's `an unknown codec is not treated as a match`
pins what the planner does with a hand-built ConcatInput(video = null). The planner's
safety rests on the probe really producing that shape, and the hand-built fixture would
go on passing if it stopped.
Measured rather than claimed: mutating concatInputFrom's initial `video` to a non-null
placeholder leaves ConcatPlannerTest green and turns this red. Dropping the planner's
video null guard turns both red -- so that half was already held, and this file does not
claim credit for it.
The coupling itself is worth writing down: ConcatPlanner guards video against a null codec
and audio not at all, and that asymmetry is correct rather than an oversight --
MediaProbe.shortName returns a non-null String, so a null audioCodec means the track is
absent and two clips with no audio really do match, while a null videoCodec means absent
*or* unreadable. The audio check is safe because the video guard fires first on a clip
nothing could read. Nothing held that.
555 -> 556 JVM tests, 0 failures. No production code changed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Each of these is a site where JaCoCo reported mi > 0 -- a concrete instruction no test
runs -- rather than a partial branch on a compound condition, which is how the group was
filtered in the first place. Six closed, one moved to the exclusions.
AndroidDeviceCodecs:35 the UNPARSEABLE sentinel, refused where an unknown name is not
ContainerCapabilities:94 accepts(container, VideoCodec.NONE, mode) -- the audio twin has
had a test since #136; the asymmetry is the argument
ContainerCapabilities:323 repairVideo's keep-the-requested-codec arm
ContainerCapabilities:348 firstContainerHolding's fallback container
OutputPublisher:230 the resolver call that throws -- the third case the KDoc names
and the one the shape list was missing
JobSnapshots:31 a job that recorded no output path at all
Every one was mutated and confirmed red, then restored. Two are worth stating because
they did not go red first time or would not have:
**The firstContainerHolding test was vacuous on its first draft.** It asserted the
refusal still offered *something*, and deleting the fallback left it green: the source
container is a candidate in its own right, so the list stays non-empty and only its
contents change. Rewritten around AVI, which has no mapping for H.265, and asserting the
codec survives -- without the fallback the app silently offers H.264 instead, which is
the actual loss. This is the failure mode CLAUDE.md records from the mutation review, met
head on rather than in the abstract.
**OutputPublisher:230 needed one line.** `a destination whose size cannot be determined is
never deleted` already walked three RowShapes; QUERY_THROWS was the fourth case its own
KDoc names -- "a resolver call that throws" -- and the only one that reaches `?: false`
through runCatching rather than through a cursor answer.
ContainerCapabilities:282's `.filter { it != exclude }` is **not** closed here and is not
a gap: nothing can make it drop anything. On the shared container `repair` always changes
at least one codec, because a codec it left alone is one validate would not have refused;
every other candidate differs by container; and the single call site passing a non-default
exclude (validateVideo:186) excludes a spec carrying VideoCodec.COPY while every repaired
candidate carries NONE. F4-shaped -- recorded rather than covered, and 550 tests agree.
550 -> 555 JVM tests, 0 failures. Five new tests rather than six: OutputPublisher:230
is one line inside a test that already existed. No production code changed.
Line 2087/2348 -> 2090/2348; branch 1011/1340 -> 1022/1340.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`ConversionForegroundType.current()` has three arms and the JVM suite executed one.
`robolectric.properties` pins everything to `sdk=36`, and `@Config` appears nowhere in
`app/src/test`, so 3 lines and 3 of 4 branches were cold.
The instrumented test is not a substitute, and the reason is specific rather than
general. `ConversionWorkerTest.foregroundTypeMatchesTheRunningApiLevel` asserts against
whichever API the leg is, so it covers one arm per leg and never the other two -- and the
legs that would cover 33 and 34 are the ones #122 wedges. From
docs/coverage-read-findings.md, an API 33 run reported `received: 60` with
`failed: unknown`: the regime was exercised and that leg could not have said so if it had
broken. This runs all three deterministically in the same ./gradlew invocation.
Four classes, not three. 35 shares its answer with 36 and looks redundant; it is the
whole point. Relaxing `>= VANILLA_ICE_CREAM` to `>` is invisible at every level except
exactly 35 -- measured, not assumed: that mutation failed ForegroundTypeApi35Test alone,
while swapping DATA_SYNC and MEDIA_PROCESSING failed 34, 35 and 36. Without the 35 class
the first mutation survives the suite.
546 -> 550 JVM tests, 0 failures. No production code changed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The stateful outer composables hand `ConverterScreenContent` and
`JoinScreenContent` a list of `viewModel::` references. No test in the suite had
ever seen that list: the content tests build their own `ConverterActions`, so
they drive the stateless inner and never touch the wiring.
THE TICKET'S PREMISE WAS HALF WRONG, AND CHECKING BEAT ASSUMING. #156 was filed
claiming a transposition of any two of seventeen bindings would survive the
suite. Measured instead of trusted:
onVideoCodec <-> onAudioCodec -> REJECTED: "Inapplicable candidate(s):
fun setAudioCodec(codec: AudioCodec)"
onCancel <-> onReset -> COMPILES
Every typed binding -- container, both codecs, preset, suggestion, quality,
engine preference -- takes a distinct parameter type, so the compiler is already
the test. Writing assertions against those transpositions would have been
theatre, and this file says so rather than quietly including them.
WHAT IS ACTUALLY AT RISK is the `() -> Unit` bindings, which are interchangeable
to the compiler: two on the converter screen (onCancel, onReset) and *three* on
the join screen (onJoin, onCancel, onReset). A Cancel button that discards the
finished file, a Start-over that leaves it on screen, or a Join button that
cancels -- each is one wrong word and each ships.
I got that wrong in the first check too: an early run reported the onCancel/
onReset swap as rejected, from a grep-and-exit-code test that misread a stale
build. Re-running it properly printed BUILD SUCCESSFUL with the swap in place.
THE SEAM. `converterActions(viewModel, onPickInput, onConvert, onSave)` and
`joinActions(viewModel, onPickInputs, onSave)`. The launcher-backed actions stay
parameters -- they need an ActivityResultLauncher, which is the part that
genuinely needs a composition, and keeping them out means the rest needs none.
Told apart by effect rather than by a recording double: `reset()` sets the state
to Idle, `cancel()` with no active job leaves it alone (`activeWorkId?.let`,
which SettingsEditsTest pins).
Mutations -- every transposition caught, each by two tests:
converter onCancel <-> onReset | 2 tests
join onJoin <-> onCancel | 2 tests
join onReset <-> onCancel | 2 tests
a typed binding dropped to {} | 1 test
a launcher action rerouted | 1 test
The two-test symmetry is deliberate: one direction alone passes against a wiring
with BOTH actions bound to the same method, which is what a copy-pasted line
produces.
Three guard assertions earned their place during writing -- the picks land
through an injected dispatcher, and without `ParkedPickDispatcher.runAll()` all
three state-based tests sat on Idle and would have asserted nothing. They failed
loudly instead of passing quietly.
`@UnstableApi` on both builders, per CLAUDE.md; lint caught their absence, as it
did in W1.
525 -> 537 tests, 88.0% -> 88.9% line, 70.5% -> 75.4% branch. Gate green.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`setPreset` was covered; the six beside it and `cancel()` had no coverage at all.
That asymmetry is the tell -- they are reachable from the JVM suite by exactly
the route `setPreset` already takes, and nothing had asked.
WHAT IS ASSERTED. Not "the setter sets something". Each of these copies into a
nested `OutputSpec`, so the failure worth catching is a setter that writes the
right value into the wrong field, or that rebuilds the spec and quietly discards
the other two. Every test asserts the field it changed AND that the rest survived.
THREE OF THEM DID NOT BITE, AND THE REASON IS WORTH KEEPING. The first run of the
mutations came back with two green:
setContainer rebuilding from OutputFormat.MP4_H265.spec -> GREEN
setQuality also resetting enginePreference to AUTO -> GREEN
Both for one mistake of mine: I asserted "the rest survived" against values that
were still at their defaults. `ConversionSettings` starts at `MP4_H265.spec`,
`QualityTier.FAST` and `EnginePreference.AUTO` -- so a mutation that RESET a
neighbouring field to its default was indistinguishable from one that left it
alone. The tests were checking a value, not a behaviour.
Fixed by moving each neighbour off its default before the call under test. A
third test had the same latent hazard -- it asserted `quality == FAST` -- and was
corrected with the others rather than left to fail later.
That is precisely the shape CLAUDE.md warns about ("five of them passing the
whole suite over a completely unguarded code path"), and it is the second time in
this wave the mutation pass has earned its place: green was not evidence.
Eight mutations, all red after the fix:
setContainer rebuilds from a preset | 1 test
setQuality resets the engine preference | 1 test
setEnginePreference resets the quality | 2 tests
applySuggestion resets quality | 1 test
setVideoCodec writes nothing | 1 test
setAudioCodec writes nothing | 2 tests
setEnginePreference writes nothing | 2 tests
cancel() dereferences a null activeWorkId | 1 test
516 -> 525 tests, 87.7% -> 88.0% line, 70.4% -> 70.5% branch. Gate green.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The join-side twin of W1, deliberately the same shape -- one refactor done twice,
and letting the two diverge would cost more than the duplication. Five arms had
never been chosen by any test, for the same reason: a real ConcatWorker only ever
reaches a terminal state with well-formed output.
WHAT THE SEAM TURNED UP. This line was in the SUCCEEDED arm:
info.outputData.getString(ConcatWorker.KEY_STRATEGY)
?.let(ConcatStrategy::valueOf) ?: ConcatStrategy.REENCODE
`valueOf` throws IllegalArgumentException on a name this build does not define,
and this runs inside a `viewModelScope` collect with no handler -- so it is not a
Failed state, it takes the process down.
Not theoretical. WorkManager keeps finished work about a week, so a downgrade or
rollback hands this build a job enqueued by another one -- the premise
`WorkerEnumFallbackTest` and `JobTags` are both written on. `ConcatWorker` writes
`result.strategy.name`, so a build that added a third strategy would leave this
one crashing on its own completed joins.
The codebase had already made this exact fix one file over, and said why:
// Looked up rather than `valueOf` -- see the same three reads in
// ConversionWorker. This one is above the try as well, so a format name this
// build does not define used to throw past the catch
The matching read on the ViewModel side had not been changed with it. It is now
`ConcatStrategy.entries.firstOrNull { it.name == name } ?: REENCODE`.
PROVEN RATHER THAN ASSERTED. Restoring `valueOf` and running the new test:
RED: an unknown strategy name is read as a re-encode rather than thrown
java.lang.IllegalArgumentException: No enum constant
org.libremediaconverter.model.ConcatStrategy.SMART_CONCAT_V2
REENCODE is the conservative default rather than an arbitrary one: it is the
answer for inputs that do not match, so a job whose strategy cannot be read is
described as the more cautious of the two rather than claimed as a lossless
stream copy. The mutation to STREAM_COPY reddens two tests.
Eight mutations, all red:
unknown strategy -> STREAM_COPY | 2 tests
runAttemptCount ignored, both directions | 2 tests
success with no path -> empty Joined | 1 test
BLOCKED unfolded from RUNNING | 1 test
blank error no longer falls back | 1 test
cancellation ignores the caller's state | 1 test
516 -> 530 tests, 87.7% -> 88.0% line, 70.4% -> 71.3% branch. Gate green:
assembleDebug, testDebugUnitTest, compileDebugAndroidTestKotlin, ktlintCheck,
detekt, lintDebug.
Stacked on W1 (#162), which this mirrors and should not land before.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`ConversionViewModel.observe` maps a `WorkInfo` onto a `ConversionState`. That is
the app's main UI state machine, and no test had ever chosen which arm it took.
NOT COLD CODE, WHICH IS THE POINT. `ConversionViewModel$observe$1$1` already
reported 28 covered lines and 24 covered branches: every test that drives a real
worker runs this. But a real worker only ever reaches a terminal state with
well-formed output, so `SUCCEEDED`-with-a-path and `FAILED`-with-a-message were
the only arms any test had produced. The other six ran never -- the progress
read, both sides of the retry check, a success naming no file, a failure with
nothing to say, `CANCELLED`, and `BLOCKED`.
A grep makes that look untrue: all six `WorkInfo.State` constants appear in the
JVM suite. They are in `ReattachmentTest`, driven into `Reattachment.choose` --
a *different* function encoding the same enqueued-means-retry rule. So the rule
had a test in one of its two homes, and the copy the user's screen reads had
none.
THE SEAM. `workManager` comes from `WorkManager.getInstance` in the constructor
and `observe` is private, so nothing could hand this a chosen `WorkInfo`. The
`when` is now `conversionStateFrom`, a pure function over a `ConversionUpdate`
carrying only the fields it reads -- the same shape as `JobSnapshot` beside
`Reattachment.choose`, and its KDoc gives the same reason. `outputData` stays a
`Data`, which this suite already builds with `workDataOf` everywhere; unpacking
it into five nullable strings would move the same reads without helping.
TWO THINGS DELIBERATELY LEFT OUTSIDE IT:
- The ownership check stays at the call site. Its comment says it guards the
file ownership the SUCCEEDED arm takes, not merely the assignment, so moving
it inside would change what it protects.
- The mapping takes no responsibility for the staged file. It returns the
state; the caller reads the file off the result. That is strictly better
than the original, where `pendingStaged = staged` happened inside one arm:
"the state and `pendingStaged` refer to the same file or to no file" is now
the shape of the code rather than a rule two branches have to keep.
Mutations, each killing exactly the test it should:
| mutation | red test |
|---------------------------------------------|-----------------------------|
| progress read ignored | reports the progress |
| runAttemptCount ignored -> always Waiting | never run is simply starting|
| runAttemptCount ignored -> never Waiting | already run is waiting |
| success with no path -> empty Converted | named no file is a failure |
| blank name/type no longer falls back | blank falls back like missing|
| blank error no longer falls back | blank message falls back |
| cancellation ignores the caller's state | lands where caller said |
| BLOCKED remapped | blocked looks like starting |
`ENQUEUED` needs both mutations and both tests: either one alone passes against a
mapping that ignores `runAttemptCount` entirely.
The extracted functions carry `@UnstableApi` rather than swallowing the marker
with `@OptIn`, per CLAUDE.md -- lint's UnsafeOptInUsageError caught their absence.
An early `@Suppress("ReturnCount")` turned out to be unnecessary and was removed
rather than left: detekt is clean without it, and the file now carries none.
502 -> 516 tests, 87.1% -> 87.7% line, 69.1% -> 70.4% branch. Gate green:
assembleDebug, testDebugUnitTest, compileDebugAndroidTestKotlin, ktlintCheck,
detekt, lintDebug.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Four messages were written out in two places each, in a codebase that already
had the convention for this and states it in `OutputPublisher.kt`:
Kept next to [STAGED_FILE_GONE_MESSAGE] for the same reason it is: both
ViewModels need it and staging is what it is about.
The ticket named three. A wider scan -- `"[A-Z][^"]{8,90}[.!]"` rather than the
{15,70} that produced the original list -- found a fourth, `"Joining failed."`,
which is the exact join-side twin of `"Conversion failed."` and had been missed
because it is fifteen characters long.
"Pick at least two files to join." -> ConcatWorker.TOO_FEW_INPUTS_MESSAGE
"Joining failed." -> ConcatWorker.GENERIC_FAILURE_MESSAGE
"Conversion failed." -> ConversionWorker.GENERIC_FAILURE_MESSAGE
"Could not save the file." -> SAVE_FAILED_MESSAGE, beside
STAGED_FILE_GONE_MESSAGE
Each constant sits with the layer that owns the condition, which is what the two
existing constants do. The arity rule is the worker's -- `request(...)` takes a
`List<Uri>` and checks nothing about its length -- so `TOO_FEW_INPUTS_MESSAGE`
lives there and the ViewModel reads it, not the other way round.
WHY THE TWO `Log.e` LITERALS STAY. `"Conversion failed."` and `"Joining failed."`
each also appear in a log line beside the failure they describe. Those keep their
own copies: a log has a different audience and carries the exception with it, and
coupling it to the user-facing wording would mean rewording the screen to change
a log. Stated in the KDoc so the next scan does not read them as a miss.
THE TEST IS A CROSS-LAYER ONE, DELIBERATELY. #158's done-when is explicit that "a
test asserting the constant equals its own value is worth nothing". Sharing a
constant makes the two sites agree by construction; what it cannot show is that
both layers still *reach* it. So `SharedFailureMessagesTest` drives each for real
-- the ViewModel through `onInputsPicked`, the worker through `doWork` -- and
asserts the two answers are the same string, taken from two running layers rather
than from one declaration.
That the sharing was worth doing at all is visible in what was pinned before:
`RefusedJobTest` (#139) pinned the worker's copy of the arity message and nothing
pinned the ViewModel's, so the screen's wording could drift with no test saying
anything.
Mutations:
| mutation | result |
|---|---|
| ViewModel keeps its own drifted literal | red |
| ViewModel's arity guard removed entirely | red |
Gate green: assembleDebug, testDebugUnitTest, compileDebugAndroidTestKotlin,
ktlintCheck, detekt, lintDebug.
Not done here: `"Saved ${s.displayName}."` appears in both screens. It is left
alone, and the reason is a real distinction rather than an oversight -- the four
above are cases where one layer's message is another layer's *fallback*, so drift
means the user sees different words for one condition. Two screens each wording
their own success text is ordinary UI, and drift there is cosmetic.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
#142 -- openOutputStream refuses two ways and only one was reachable. A
provider that has gone away throws from inside the call, which
`a destination the provider will not open...` already drives. A provider
that is present and declines returns null, and nothing could produce that
on demand. openDestination is the seam; the test asserts the failure names
the destination, which is what separates the `?: error(...)` from an NPE
inside `use`.
#143 -- the sweep's re-read. **The seam the ticket proposed does not reach
it.** Overriding the listing fires before the entries are snapshotted, so
StagingSweep.collectable is handed the new timestamp, the file is never
proposed for deletion, and the guard is never exercised. Measured: with an
entriesIn seam, deleting the guard outright left the test green.
The race is a file that *was* collectable when the snapshot was taken and
is not by the time the delete comes round, so the seam has to sit at the
snapshot. `snapshot(listing)` does, and deleting the guard now reddens the
test.
Three mutations after the move, three red:
null stream returns silently null-return test
null stream via !! instead null-return test
sweep deletes unconditionally race test
OutputPublisher.kt now has no never-executed lines at all. Two partial
branches are left and both are named exemptions rather than gaps:
L216's `getOrNull() ?: false` and L304's `getOrDefault(absoluteFile)` are
the failure arms of a runCatching whose body cannot be made to throw
through any public entry point -- the same shape as the `size >= 0`
exemption recorded in the previous commit.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`the sweep tolerates a staging path that is not a directory` failed once on run
33069641674, against 468 tests that pass on this machine including under
`--rerun-tasks`:
java.io.FileNotFoundException at OutputPublisherStagingTest.kt:112
468 tests completed, 1 failed
Line 112 was `writeBytes` immediately after `deleteRecursively()`.
`FileOutputStream` answers `FileNotFoundException` for an existing directory, so
something had recreated the path inside that window. That something is
`LibreMediaConverterApp.onCreate`, which ends with
appScope.launch { OutputPublisher(...).sweepStaging() }
on `Dispatchers.IO`, and `sweepStaging` reads `stagingDir`, whose getter calls
`mkdirs()`. Robolectric builds the application for every test that asks for one,
so that background `mkdirs()` is in flight across the whole suite on a thread the
paused main looper does not control and no test awaits.
Retrying closes the window rather than narrowing it, because the race is not
symmetric: `mkdirs()` fails on an existing regular file, so the invariant only has
to survive being *established*. Once a write lands, nothing in the suite can turn
this path back into a directory -- which is also why the new assertion that the
sweep left a file behind is worth making.
The `check()` matters as much as the loop. The next failure here should say
"something recreated conversions/ as a directory", not `FileNotFoundException at
line 112` -- that is the difference between a flake someone reads and a flake
someone re-runs.
The wider problem is #159 and is deliberately not fixed here: `AppStartSweepTest`,
`JobSnapshotsTest` and `SpaceArithmeticTest` all name the same path, and the real
answer is an injectable scope rather than a retry loop in every staging test.
#159's done-when is that this loop can be deleted.
Mutation: `listFiles() ?: return` -> `listFiles()!!` reddens exactly this test.
Gate green: assembleDebug, testDebugUnitTest, compileDebugAndroidTestKotlin,
ktlintCheck, detekt, lintDebug.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
destinationIsKnownEmpty's three short-circuits -- no SIZE column, no row,
a null cell -- each had to answer false and none was tested. Its KDoc is
unambiguous about why: "this decides whether a delete is allowed and 'I
could not tell' must never authorise one." The existing tests only ever
drove a provider that answers properly, where the answer is zero and the
delete is correct. Getting the uncertain cases backwards costs the user a
file they already had, on a save that failed.
Also discardStaged's null parentFile, and sweepStaging's null listing --
which is not the case the existing `tolerates a staging directory that
does not exist yet` covers, because stagingDir's own mkdirs() recreates a
missing directory and it then lists as empty. Only a path that cannot be
a directory makes listFiles() answer null.
Five mutations, three bite:
drop !row.isNull(size) short-circuit test red
drop row.moveToFirst() five tests red
parentFile!! instead of ?: return false parentless test red
size >= 0 -> size >= -1 GREEN, does not bite
parentless treated as staged GREEN -- bad mutation, see below
The first green one is recorded in the test as a named exemption.
Measured: getColumnIndex returns -1 for an absent column and isNull(-1)
throws CursorIndexOutOfBoundsException, which the surrounding runCatching
already turns into `?: false`. Same answer, reached by the exception path,
so no behavioural test can pin that conjunct. It stays anyway -- control
flow through an exception is worse than a comparison, and another Cursor
implementation need not throw.
The second was my mistake rather than a finding: substituting stagingDir
for the null parent reaches `return false` by a different route, so it
proves nothing. parentFile!! is the honest mutation and it goes red.
:197, :235 and :258 are now covered. What is left in this file is exactly
what the ticket scoped out: :173-174 (#142) and :267 (#143).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Nothing had ever handed InputQuery a cursor row. UnknownInputSizeTest
drives the no-provider case thoroughly -- query returns null, measure()
answers -- so firstRow's body, displayNameOrNull and sizeOrNull had never
executed at all.
Nine tests over FakeSafProvider's RowShape states. What they pin is not
"reads a cursor" but the rule the class exists for: a size nobody could
determine must arrive as null, never 0. Four separate ways a provider
fails to give one -- a null cell, a missing column, a negative value, an
empty cursor -- plus a provider that throws outright, which is the guard
firstRow's KDoc is written for.
Mutations run, all four bite:
drop `takeIf { it >= 0 }` from sizeOrNull -> negative-size test red
drop `!isNull(it)` from sizeOrNull -> null-size test red
drop the runCatching in firstRow -> throwing-provider test red
drop `!isNull(it)` from displayNameOrNull -> GREEN, does not bite
That last one is recorded in the test's KDoc as a named exemption rather
than papered over. Measured: MatrixCursor.getString on a null cell returns
null while getLong returns 0. So the guard is load-bearing on the size path
-- it is what stops a null becoming a real number -- and unfalsifiable on
the name path, where getString already yields null. It stays regardless:
Cursor.getString's contract makes throwing on null implementation-defined,
and a real provider may do what MatrixCursor does not.
InputQuery.kt now has no never-executed lines. Suite 456 -> 465 tests,
branch coverage 63.8% -> 65.6%.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Two of #132's items are cursor-shaped -- InputQuery's row reads (#137) and
OutputPublisher.destinationIsKnownEmpty's short-circuits (#140) -- and the
provider that could drive them lived inside OutputPublisherPublishTest and
could only answer correctly. Its row was always (file.name, file.length()).
Moved FakeSafProvider, FakePlainProvider and the registration helper to
FakeProviders.kt, same package, following StagingCleanupSupport.kt and
ParkedPickDispatcher.kt. UnreliableOutputStream stays behind: it serves one
test, which is the line WorkerStubs.kt draws.
Added RowShape, seven ways a provider can answer a metadata query. Column
granularity is deliberate -- OutputPublisher reads only SIZE, InputQuery
reads both and reaches different answers depending on which is bad -- and so
is keeping null, missing, negative and no-row distinct rather than folding
them into one "bad" case. That distinction is the whole reason InputQuery
exists: hasSpaceFor(0) is only "is there 128 MB free", so a size nobody
could determine must not arrive as 0.
No production change. OutputPublisherPublishTest, OutputPublisherStagingTest
and UnknownInputSizeTest pass unchanged.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
A gap audit over the eight branches merged together looked for lines still
never executed and asked, for each, whether something already accounts for it.
Everything mapped except one: `ConcatWorker.kt:42`, the refusal of a join with
fewer than two inputs.
Its neighbour maps. `ConcatWorker.kt:40` -- the missing-URI-array arm, two lines
above -- is covered on the device by
`UnopenableUriTest.aJoinWithNoInputArrayFailsWithAMessage`. That is invisible to
JaCoCo, which measures `testDebugUnitTest` only, so the report shows both arms
cold and cannot distinguish the one that is e2e-covered from the one nothing
touches. Only reading the androidTest source separates them.
`grep` says nothing in either source set mentions "Pick at least two files to
join." Two tests here now do:
- `a join of a single file is refused with a message rather than joined` pins
the verdict and the message together, via `Failure.equals`, for the reason the
file's header already gives.
- `a join of two files is not refused for its count` is the control that puts
the assertion on the boundary rather than on the string. It refuses the
*space* rather than letting the job run: the next thing past the count guard
is `ConcatEngine`, which is native, and `NamingPublisher`'s KDoc already
records that no JVM test gets past it. A failure carrying the space message is
proof execution reached line 57, which is proof it cleared line 42, at no
engine cost.
Reachability is the header's argument plus one of its own: `request(...)` takes
a `List<Uri>` and checks nothing about its length, so a one-item join is a
well-formed call rather than a corrupted queue entry.
Mutations, each killing exactly the test it should:
| mutation | red |
|---|---|
| guard deleted outright | `a join of a single file is refused...` |
| `uris.size < 2` -> `< 3` | `a join of two files is not refused for its count` |
Restored, both green. Gate green: assembleDebug, testDebugUnitTest,
compileDebugAndroidTestKotlin, ktlintCheck, detekt, lintDebug.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
#84 closed by classifying probeWithExtractor and probeForConcat as
device-bound and explicitly not a gap. That was right about FFprobe and
right about the measurement boundary, and wrong that these are only
orchestration. The track walk is a branch matrix, and androidTest reaches
it only through whatever the committed fixtures happen to contain -- so
none of its rules is *chosen* by any test there.
#133 offered two ways to reach it: drive ShadowMediaExtractor, or cut the
loop into a pure function. Taking the second, which is the pattern
CLAUDE.md names and work/FailureOutcome.kt documents. extractedFrom and
concatInputFrom take List<MediaFormat>; what is left needing a device --
setDataSource, getTrackFormat, release -- is one three-line extension
function, which is the thin edge androidTest should be covering.
The two are deliberately not merged despite the overlap. One reads
duration and not frame rate; the other reads frame rate and not duration.
A merged version would compute both for every caller, and ConcatPlanner
treats an unknown frame rate as "cannot prove a match" -- so a field the
join flow does not need must not start arriving as a number.
Eleven tests over cases no fixture provides: two video tracks, two audio
tracks, audio outlasting video, a track with no KEY_DURATION, audio
declared before video, a subtitle track, and no tracks at all.
Six mutations, six red:
last video track wins first-video test
last audio track wins first-audio test
duration = last rather than max longest-track test
drop the containsKey guard six tests (getLong throws on a missing key)
guess a frame rate of 30 no-frame-rate test
join takes the last video track join frame-rate test
MediaProbe's missed branches drop 91 -> 70; what is left is the FFprobe
half and the two catch arms, which are native and device-bound exactly as
#84 said.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Both exits were cold, and both are reachable for the same reason: a job
does not have to come from the picker. WorkManager keeps work for about a
week, so a downgrade or rollback hands this build a job enqueued by
another one, and request(...) is callable directly.
:62 -- a missing KEY_INPUT_URI -- was untested everywhere, JVM and device.
The nearest e2e test, ForcedFailureTest.aMissingInputFailsRatherThanCrashing,
passes a URI pointing at a file that does not exist, which reaches the
engine and fails much later with a different message.
:124-126 -- the Validation.Invalid refusal -- had no test at all, though
its comment names both arrival paths it exists for.
Five tests, in a new file because both are about the *message*. A refusal
that fails with empty output Data renders the UI's generic "Conversion
failed." with nothing else to say, which is the defect shape
DeniedForegroundStartTest records from the device pass; asserting the
verdict alone would pass against exactly that.
Two of the five are there to stop the others passing for the wrong reason:
`a refused spec never reaches an engine` says it failed *before*
converting rather than during, and `a valid spec is not refused` is the
control -- without it every assertion here would still pass against a
worker that refused everything.
Three mutations, three red:
change the no-input message no-input message test
drop the validation refusal both refusal tests
validate but keep converting both refusal tests
L61-62 and L123-126 are now fully covered, branches included.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
ConversionWorker has WorkerCancellationTest and DeniedForegroundStartTest.
Its twin had the retry case only -- `a join whose foreground start is
denied` already existed -- so two of ConcatWorker's three failure exits
were cold: the CancellationException arm, and FOREGROUND_DENIED.
Four tests, added to the files that own each rule rather than to a new
ConcatWorker file, which is how this suite is organised: a file per rule,
tested across both workers.
The cancellation seam is worth a look in review. The conversion twin
cancels inside the engine, which is honest there because
ConversionDependencies has a seam for it. ConcatWorker calls ConcatEngine
directly and has none -- it is native and nothing here gets past it -- so
the cancellation is injected at the only other point inside the try,
setForeground. That is a real shape rather than a contrivance: a job
cancelled while WorkManager is promoting it is exactly when that window is
open, and the catch arm cannot tell where in the try it came from.
FailedFuture moved to WorkerStubs.kt on the way. Two tests now inject two
different failures through it, and Kotlin will not take two file-private
top-level classes of one name in one package.
Four mutations, four red, each isolated:
cancellation arm -> Result.failure propagation test only
drop delete on cancellation cancellation-partial test only
FOREGROUND_DENIED -> Result.retry past-the-bound test only
drop delete on the Throwable path give-up-partial test only
ConcatWorker's :92, :95-96 and :105-106 are covered; missed branches 4 -> 3.
What is left is what the ticket scoped out: the two input guards (e2e), the
ConcatEngine success path (native), and getForegroundInfo (#88's named
exemption).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The two halves of ContainerCapabilities.validate were written together
and only one of them was ever checked. Six audio outcomes had no test --
every one a string the user reads -- while the video twin of each was
already covered.
Seven tests, deliberately shaped like their twins rather than as a fresh
idea about what to assert:
unidentifiable source audio on a COPY twin of `an unidentifiable
source codec cannot be copied`
container cannot hold the copied source twin of `a codec the container
cannot hold is refused...`
container cannot carry it on encode twin of `H265 in AVI is refused`
this app cannot encode it twin of `copying is offered as
the fix when...`
accepts(_, AudioCodec.NONE, _) -> true twin of the VideoCodec.NONE arm
accepts(_, AudioCodec.COPY, _) throws twin of `resolving COPY before
asking the matrix is required`
The seventh is not the audio axis: validateVideo's copy-into-a-container-
that-cannot-hold-it refusal was the one video outcome with no test, and it
is the same shape and the same file.
Each asserts the message verbatim and re-validates every suggestion the
refusal offers. Validation.Invalid promises its suggestions are themselves
valid and names this class as the proof; the existing property test walks
the presets, and no preset reaches suggestions() through validateAudio.
Seven mutations run, seven red, each isolated to exactly one test:
CARRIES_AUDIO check -> false encode-path test only
drop the COPY error arm resolve-first test only
AudioCodec.NONE -> false no-audio-track test only
drop ENCODABLE_AUDIO check unencodable test only
drop audio copy container check audio-copy test only
drop video copy container check video-copy test only
drop unidentified-audio guard unidentifiable test only
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
WorkerEnumFallbackTest already existed for this defect class -- a name
this build does not define, read above the try, throwing out of doWork
entirely: FAILED with reschedule=false, empty output Data so the screen
said "Conversion failed." with nothing else, and the staged file never
deleted. It covered 2 of the 5 above-the-try reads. readSpec's three
were the ones left, and all three were cold.
The baseline is the part worth reviewing. readSpec returns the *entire*
fallback spec the moment any one axis fails to resolve, so a test
starting from MP4_H265 -- which is itself the fallback -- cannot tell a
worker that read the spec correctly from one that gave up on it. These
start from MKV/H.264, which differs on container and video codec at
once, and assert the spec that actually reached the transcoder rather
than only that a Result came back.
Mutations run, four for three tests:
KEY_CONTAINER `?: return fallback` -> `?: error(...)` -> container test red
KEY_VIDEO_CODEC same -> video test red
KEY_AUDIO_CODEC same -> audio test red
fallback = MP4_H264 instead of MP4_H265 -> all three red
The first three confirm the tests are isolated to their own axis; the
fourth confirms they pin *which* spec ran, which is what "a Result at
all" would have missed.
readSpec is now fully covered, branches included.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The JVM suite had no timeout of any kind, so #125's Room/WorkManager lock-order
inversion ran until something outside it gave up: 47 minutes locally, and on CI
it would burn the Unit tests job's 30-minute cap and report as a job timeout
with no cause. The deadlock is monitor contention, which no interrupt breaks, so
nothing inside the JVM could have ended it either.
The obvious fix does not work here. A JUnit `Timeout` -- as a rule or as
`@Test(timeout = ...)` -- runs the test body on a separate thread, and every Compose test in this
source set goes through Robolectric's paused main looper. Both forms fail with
"main looper can only be controlled from main thread"; the same tests with the
timeout removed pass, so it is the mechanism and not the probe.
So the bound comes from outside the test JVM, where it moves no threads:
`timeout` on the Test tasks kills the forked worker, and a watchdog jstacks that
worker two minutes earlier. The jstack is the point. Gradle's timeout on its own
kills silently, a timed-out run writes no XML for the class that hung, and the
JVM's own "Found one Java-level deadlock" section naming both monitors is the
only reason #125 could be described at all -- so it goes to stdout as well as to
a file, because the Unit tests job uploads only reports/tests/.
Ten minutes is against the slowest observed passing run, not the typical one:
eight CI samples of the whole invocation ranged 62-90s, so this is ~6.7x that
and a third of the job cap. A timeout that fires on a healthy slow runner turns
a real signal into noise.
Both numbers live in a build script that nothing compiles, so HangBoundTest
reads them back and the build script joins build.yml as a declared input --
without that the guard would go stale on exactly the edit it exists to catch.
Refs #125.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Two accuracy fixes to notes the earlier commits left behind.
The test KDocs carried "roughly 1-in-130" and a 400-leg-attempt denominator.
Both come from earlier comments on #49 that its own census later replaced --
that ticket has three recorded corrections to its rate claims, and a
superseded figure in a permanent comment is the exact thing its author kept
having to fix. What survives the corrections is the count and the spread:
four occurrences, API 33, 35 and 36, every one on attempt 1 and green on
re-run.
The save exemption described a real defect with nowhere to look it up. It is
#123 now, so the KDoc names a number instead of trailing off.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The note claimed `save` is left unguarded because nothing can overwrite what
it writes. That half is true -- the only observation that could belongs to a
job already in a terminal state. The other half was missing: a save whose
copy is still in flight when the user taps Start over lands `Saved` on a
screen they have just cleared.
Guarding it would drop that write instead, which reports nothing for a file
that may genuinely have reached the destination. That is a question about
what the screen should offer during a save, and answering it in a race fix
would be deciding it by accident.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`reattach()` read `_state.value`, found it `Idle`, and then handed the job
to `observe()` -- which launches a *separate* coroutine that cannot write
until its `collect` has resumed with a `WorkInfo`. So the check happened at
one moment and the write landed at another, with a whole pick able to fit
in between: the user tapped, their metadata query suspended, the guard saw
an empty screen, and the finished job from an earlier session wrote over
`Ready(picked)` a moment later.
The comment above that guard said "no suspension point between this check
and the assignment below, so nothing can interleave". There is no
assignment below, and the two lines are in different coroutines. That
sentence is why this sat as flaky CI for two days rather than being read as
the product race it is.
`ScreenOwnership` makes the answer the test already encodes -- the user's
pick wins -- true rather than probable. A claim is taken synchronously when
the user acts; every write that lands after a suspension point checks the
claim it was made under and drops itself if that claim has been superseded.
Dropped, not reordered: a write that is dropped cannot come back later.
Cancelling the superseded observer was never enough on its own. `Job.cancel`
is honoured at the next suspension point, and a collector that has already
resumed and is on its way to `_state.value = ...` has none left; the write
lands anyway. It also cannot help at all in the case reported, where nothing
supersedes the observation until after it has been launched.
`JoinViewModel` had the identical shape and nothing watching it, so it gets
the same fix and the counterpart test that was missing. Its pick dispatcher
becomes injectable for the same reason `ConversionViewModel`'s already was:
without that seam there is no way to ask what happens while a pick is still
in flight.
Closes#49
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
JMR-devandClaude Opus 5