Update audio tests

[imnasnainaec]

This change is 

Summary by CodeRabbit

• Tests
  • Strengthened audio upload/download/delete tests: now assert returned result instances, verify creation of replacement words when audio is removed, ensure new IDs differ from originals, and confirm frontier contains the expected single entry with correct audio/state.
  • General test improvements: switched to explicit synchronization, added null/not-null and history/metadata assertions, and added repository cleanup to reset test state.

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📝 Walkthrough

Walkthrough

Tests updated to reflect upload/delete flows that return a new frontier word (new ID) instead of mutating the original; assertions changed from strict type checks to instance checks; service tests switch some async .Result usages to .Wait() and add explicit null/history/EditedBy/UsingCitationForm assertions.

Changes

Cohort / File(s)	Summary
Audio Controller Tests Backend.Tests/Controllers/AudioControllerTests.cs	Replaced Is.TypeOf assertions with Is.InstanceOf; cast controller responses to OkObjectResult and extract newId; verify newId != original wordId, fetch word by newId, assert non-empty Audio on upload and frontier contains single entry with matching Id and empty Audio after delete; added repository cleanup Wait() calls.
Word Service Tests Backend.Tests/Services/WordServiceTests.cs	Replaced .Result with .Wait() for repository creates; updated tests to expect creation of a new word on audio deletion/update (new Id), assert EditedBy, History.Last() == oldId, frontier count == 1, UsingCitationForm flags, and explicit null checks; minor formatting/null-check adjustments.

Sequence Diagram(s)

mermaid
sequenceDiagram
participant Test
participant AudioController
participant WordService
participant Repository
Test->>AudioController: Send Upload/Delete audio (userId, wordId)
AudioController->>WordService: Call Upload/Delete (userId, wordId)
WordService->>Repository: Create new word / update frontier (persist)
Repository-->>WordService: return newWord / newId
WordService-->>AudioController: return OkObjectResult(newId)
AudioController-->>Test: 200 OK with newId
Test->>Repository: Fetch word by newId / GetFrontier
Repository-->>Test: Word / Frontier (Id == newId, Audio empty for frontier)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Word service update return type #4150: Related changes to WordService.Update and caller semantics (tests/controllers updated to handle new-word/new-id return behavior).
• [WordService] Refactor RestoreFrontierWords #4161: Related frontier restoration refactor affecting frontier/word-id/history behavior asserted in these tests.
• Allow getting a word from the Frontier #4148: Related frontier API and upload/delete changes that align with updated controller/test expectations.

Suggested reviewers

• jasonleenaylor

Poem

🐇 I hopped through tests with a thump and a grin,

Old audio removed — a new id tucked in.
Frontier now holds the freshest seed,
History kept, and edits proceed.
🥕 Hooray — I danced a tiny rabbit spin!

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check	❓ Inconclusive	The title "Update audio tests" is vague and generic. It describes the general category of change (updating tests related to audio) but lacks specificity about what was actually updated or why.	Consider a more specific title that describes the primary change, such as "Refactor audio controller and service tests to use instance-based assertions" or "Update audio tests with improved result handling and frontier validation".

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch backend-audio-tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.07%. Comparing base (30b5b90) to head (2d810f5).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4153       +/-   ##
===========================================
+ Coverage   74.76%   86.07%   +11.30%     
===========================================
  Files         302       56      -246     
  Lines       11087     4839     -6248     
  Branches     1394      603      -791     
===========================================
- Hits         8289     4165     -4124     
+ Misses       2394      528     -1866     
+ Partials      404      146      -258     

Flag	Coverage Δ
backend	86.07% <ø> (-0.02%)	⬇️
frontend	?

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[jasonleenaylor]

Backend.Tests/Services/WordServiceTests.cs line 81 at r1 (raw file):

            // New word is correct
            Assert.That(newWord, Is.Not.Null);
            Assert.That(newWord!.Id, Is.Not.EqualTo(oldId));

See if we can avoid this, as this is clearly impossible given the line above.

[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (2)

Backend.Tests/Services/WordServiceTests.cs (1)

75-97: Consider asserting newWord.Audio is empty — the primary effect of DeleteAudio is untested.

The test verifies all the side-effects (frontier state, history, EditedBy, word count, old-word preservation) but never directly asserts that the audio entry was actually removed from the returned word. A single assertion would close this gap:

🛠️ Proposed addition

     Assert.That(newWord, Is.Not.Null);
     Assert.That(newWord.Id, Is.Not.EqualTo(oldId));
+    Assert.That(newWord.Audio, Is.Empty);
     Assert.That(newWord.EditedBy.Last(), Is.EqualTo(UserId));
     Assert.That(newWord.History.Last(), Is.EqualTo(oldId));

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@Backend.Tests/Services/WordServiceTests.cs` around lines 75 - 97, Add an
assertion that the returned newWord has no audio entries to verify DeleteAudio's
primary effect: update the test in WordServiceTests (the DeleteAudio scenario)
to assert newWord.Audio is empty (e.g., Assert.That(newWord.Audio, Is.Empty) or
Assert.That(newWord.Audio.Count, Is.EqualTo(0)); keep the existing assertions
about frontier, history, and oldWord intact.

Backend.Tests/Controllers/AudioControllerTests.cs (1)

177-198: Consider adding a history assertion for the superseded word (oldId).

The test now validates frontier state well. However, since DeleteAudioFile creates a new word entry (newId), the old word (oldId) should be present in history. The removed history assertion left a small coverage gap — a follow-up check like Assert.That(await _wordRepo.GetWord(_projId, oldId), Is.Not.Null) or checking the history collection would guard against regressions in the historical record.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@Backend.Tests/Controllers/AudioControllerTests.cs` around lines 177 - 198,
Add an assertion to verify the superseded/original word (oldId) was preserved in
history after DeleteAudioFile; call the repository method that retrieves
historical entries (e.g., _wordRepo.GetWord(_projId, oldId) or the history
collection getter) and assert the result is not null (or that history contains
an entry with Id == oldId) so the test ensures the original word remains in
history while newId is returned and placed in the frontier.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@Backend.Tests/Controllers/AudioControllerTests.cs`:
- Around line 116-120: The test passes a nullable string (newId from
result.Value as string) into _wordRepo.GetWord which expects a non-nullable
string causing CS8604; fix by either asserting non-null and using the
null-forgiving operator when calling _wordRepo.GetWord (e.g., pass newId! to
GetWord) or by adding a specific compiler suppression for CS8604 in the
project/ruleset so the single Assert.That(newId, Is.Not.Null) is respected;
locate newId and the _wordRepo.GetWord(...) call to apply the chosen change.

---

Duplicate comments:
In `@Backend.Tests/Controllers/AudioControllerTests.cs`:
- Around line 120-122: The test assertion was updated correctly: keep the
assertion using foundWord (from GetWord) and assert Assert.That(foundWord,
Is.Not.Null) followed by Assert.That(foundWord.Audio, Is.Not.Empty) (do not add
a null-forgiving operator); this properly verifies Audio content given Word
initializes Audio in its constructor and adheres to the NUnit3001 suppressor
convention in the AudioControllerTests / GetWord usage.

---

Nitpick comments:
In `@Backend.Tests/Controllers/AudioControllerTests.cs`:
- Around line 177-198: Add an assertion to verify the superseded/original word
(oldId) was preserved in history after DeleteAudioFile; call the repository
method that retrieves historical entries (e.g., _wordRepo.GetWord(_projId,
oldId) or the history collection getter) and assert the result is not null (or
that history contains an entry with Id == oldId) so the test ensures the
original word remains in history while newId is returned and placed in the
frontier.

In `@Backend.Tests/Services/WordServiceTests.cs`:
- Around line 75-97: Add an assertion that the returned newWord has no audio
entries to verify DeleteAudio's primary effect: update the test in
WordServiceTests (the DeleteAudio scenario) to assert newWord.Audio is empty
(e.g., Assert.That(newWord.Audio, Is.Empty) or Assert.That(newWord.Audio.Count,
Is.EqualTo(0)); keep the existing assertions about frontier, history, and
oldWord intact.

[jasonleenaylor]

@jasonleenaylor reviewed 2 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on imnasnainaec).