test(react-grab): cover freeze pause/resume for non-useState hooks

[aidenybai]

Summary

• The freeze coverage gap was the real one: freeze-updates.ts (the "inherently fragile" React-internals module) was only exercised via useState, leaving useReducer/useTransition/useSyncExternalStore hook-queue pausing and the entire context-dependency pause/resume block (lines 237–296) at 0%.
• Adds a FreezeHookHarness to the Vite fixture (useReducer, useTransition, useSyncExternalStore, and a useContext provider/consumer), each bumped by a handler that bypasses useState.
• Adds freeze-hooks.spec.ts (5 tests) asserting each counter is held frozen during prompt-mode freeze and resumes normal updates after unfreeze.

Scoped to just the freeze specs, freeze-updates.ts moved from 55.67% → 61.94% lines (with the context-dependency paths now executing); higher across the full suite.

Notes

• The slider-drag and 0% inlined-util "gaps" turned out to be Solid-JSX/sourcemap remapping artifacts (e.g. handleTrackPointerUp shows hits while handleTrackPointerDown shows 0 — impossible in a real drag), so no tests were added there and coverage config was left untouched rather than gamed.

Test plan

• freeze-hooks.spec.ts — 5/5 pass
• Full Playwright suite — 754 passed
• pnpm typecheck clean
• pnpm lint — 0 warnings / 0 errors

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Note

Low Risk
Test-only changes to the e2e app and Playwright specs; no production freeze or runtime logic is modified.

Overview
Adds e2e coverage for react-grab’s page-freeze behavior on React hooks beyond useState, which existing freeze-updates tests did not exercise (including context-dependency pause/resume in freeze-updates.ts).

A new FreezeHookHarness on the Vite fixture exposes counters driven by useReducer, useTransition, useSyncExternalStore, and a context consumer. freeze-hooks.spec.ts (five cases) enters prompt-mode freeze, bumps each counter via synthetic clicks (overlay-safe), asserts values stay fixed while frozen, then checks updates resume after unfreeze; one test asserts all four counters stay frozen in a single freeze cycle.

^{Reviewed by Cursor Bugbot for commit 198e9c8. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Summary by cubic

Adds a FreezeHookHarness to the Vite E2E app and 5 tests covering freeze pause/resume for non-useState hooks (useReducer, useTransition, useSyncExternalStore, and context). This exercises hook-queue and context-dependency paths in freeze-updates.ts, raising freeze spec line coverage from 55.67% to 61.94%.

• Refactors
  • Extracted harness into its own module and wired into the app; relocated the external-store singleton.
  • Stabilized tests with settle waits, synthetic DOM clicks to bypass the overlay, and a guard for missing nodes; narrowed the combined test to assert simultaneity.

^{Written for commit 198e9c8. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
react-grab-storybook	Ready	Preview, Comment	Jun 28, 2026 9:36am
react-grab-website	Ready	Preview, Comment	Jun 28, 2026 9:36am

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commit: 198e9c8

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}

[aidenybai]

Superseded by #510, which consolidates all the test-coverage PRs into one. Commits preserved there.