Rewrite lane and book-detail test suites with React Testing Library

[jonathangreen]

Description

Rewrites the lane-editing and book-detail editing test suites with React Testing Library.

Migrated suites (old enzyme test in src/components/__tests__/ removed, RTL test added/expanded in tests/jest/components/):

• Lanes
• LanesSidebar
• LaneEditor
• Lane
• ClassificationsForm
• BookCoverEditor
• GenreForm
• Contributors
• EditorField
• CatalogPage

Migration notes (carried over from #316, for the suites in this PR):

• The lane suites (Lanes, LanesSidebar, LaneEditor, Lane) and the book-detail forms previously mounted under enzyme; state()/instance() reads become DOM assertions and userEvent interactions.
• Lane merges into an existing jest suite rather than adding a new file.
• Enzyme live-instance-method spies become observable behavior instead of assertions on class internals, with tiny test subclasses where needed to drive branches the base method short-circuits.
• Where a suite covers a connected panel, it renders the connected default export so mapStateToProps/mapDispatchToProps stay covered.

This is one of four PRs splitting the oversized #316 into independently reviewable pieces, grouped by feature area. Each split branches from main and touches a disjoint set of component test files, so the four can be reviewed and merged in any order.

Motivation and Context

#316 rewrote the HARD-tier and remaining merge test suites from enzyme to React Testing Library in a single ~11k-line change, which is impractical to review. Splitting it by feature area keeps each PR at a reviewable size while preserving the same net result. These were among the hardest suites in the mocha/chai/enzyme → jest/RTL migration — enzyme mounted them and poked class internals, so the rewrites re-express those assertions as DOM and behavior checks.

How Has This Been Tested?

npx jest --selectProjects unit over the migrated suites on this branch: 10 suites / 111 tests pass. No application source changes — test files only.

Checklist:

• All new and existing tests passed.

[claude]

Claude finished @jonathangreen's task in 4m 22s —— View job

---

Code Review

• Read the PR diff and changed test files
• Compare new RTL suites against the deleted enzyme suites for coverage gaps
• Assess correctness of test logic (assertions, mocks, drag boundaries)
• Post review

Summary

This is a clean, well-executed enzyme → RTL migration. I traced each new suite against the component it exercises (LanesSidebar, Lanes, Lane, LaneEditor, BookCoverEditor, ClassificationsForm, GenreForm, Contributors, EditorField, CatalogPage) and the assertions line up with real behavior — the drag-boundary isDropDisabled matrix, the reorder payload handed to changeLaneOrder, the exact changeCoverLink.href on save, and the FormData contents all check out. The three earlier greptile P1 concerns (loose lane-order payload, loose cover-save URL, missing top-level→sublane drag boundary) are all resolved in the current revision — the new "keeps a dragged top-level lane in the top-level list" test is the mirrored boundary case that was requested, and it correctly asserts top stays enabled while both parent droppables are disabled. The mock strategy is well-documented (marker Link, hand-driven react-beautiful-dnd handlers, MockLaneCustomListsEditor as a class so the imperative ref API resolves), and the reorder flow reaching into ref.current for drag/state is a justified escape hatch since jsdom can't perform a real drag. I found no blocking issues. On the shared genreData fixture imported from src/components/__tests__/ by ClassificationsForm/GenreForm — agreed this is fine to defer; just make sure that fixture moves alongside these imports when the follow-up deletes the legacy __tests__ dir, otherwise these two suites break.

Nice work — no changes requested.
· rtl-lanes-books

[greptile-apps]

Greptile Summary

This PR rewrites lane and book-detail component tests with React Testing Library. The main changes are:

• Removed legacy Enzyme suites from src/components/__tests__/.
• Added RTL coverage under tests/jest/components/.
• Migrated lane editing, drag/drop, catalog, cover, contributor, genre, and classification form tests.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
tests/jest/components/Lanes.test.tsx	Migrates lane tests to RTL and checks the reordered lane payload on save.
tests/jest/components/BookCoverEditor.test.tsx	Migrates cover editor tests to RTL and checks the exact cover save endpoint.
tests/jest/components/LanesSidebar.test.tsx	Migrates sidebar tests to RTL and covers drag-start drop-boundary behavior.

_{Reviews (5): Last reviewed commit: "Rewrite lane and book-detail test suites..." | Re-trigger Greptile}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.36%. Comparing base (9fdb519) to head (fdb4fce).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #319      +/-   ##
==========================================
+ Coverage   90.14%   90.36%   +0.22%     
==========================================
  Files         205      205              
  Lines        7610     7610              
  Branches     1664     1664              
==========================================
+ Hits         6860     6877      +17     
+ Misses        437      422      -15     
+ Partials      313      311       -2     

Flag	Coverage Δ
jest	90.36% <ø> (+0.22%)	⬆️

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[jonathangreen]

The Claude code review bots minor comment:

These two new unit suites import the shared genreData fixture from src/components/__tests__/

Is valid, but I'm going to handle cleaning this up in a follow up PR after these get merged, when I delete the old __tests__ dir.