fix: repair broken Jest test suite and run it in CI

[trinadhkoya]

Problem

On a fresh clone, bun run test fails before running a single test. Because neither CI workflow (release.yml, publish-canary.yml) runs the tests, this went unnoticed. There were several independent breakages:

1. babel.config.js references module:metro-react-native-babel-preset, which isn't a dependency and was removed in RN 0.73+. RN 0.78 (used here) ships @react-native/babel-preset instead.
2. jest.setup.js calls jest.requireActual("react-native/Libraries/ReactNative/oss/ReactNativeRenderer-prod") — that path no longer exists in RN 0.78, and its result was never even used.
3. Tests import the deprecated @testing-library/react-hooks, which can't auto-detect a renderer under React 18.
4. react-test-renderer was pinned to ^19 while react is 18.3.1 → TypeError: Cannot read properties of undefined (reading 'S').
5. A leftover global.window = {} in jest.setup.js shadowed the global object and broke setTimeout under @testing-library/react-native.
6. The Keyboard mock was a no-op (addListener didn't store handlers, emit did nothing), so the useKeyboard tests couldn't drive the hook.
7. eslint-plugin-react is imported by eslint.config.mjs but wasn't a dependency, so bun run lint also failed.

Changes

• babel.config.js: switch to @react-native/babel-preset.
• jest.setup.js: remove the dead requireActual and the global.window shim; make the Keyboard mock a real emitter.
• Migrate all 8 test files from @testing-library/react-hooks to @testing-library/react-native (renderHook / waitFor).
• useRefresh.test.ts: await act(async …) so the promise microtask flushes under React 18.
• package.json: drop the unused @testing-library/react-hooks, align react-test-renderer to 18.3.1, add eslint-plugin-react.
• Add .github/workflows/ci.yml running typecheck + lint + test on push and PR so this can't silently break again.

Verification

bun run typecheck   ✅
bun run lint        ✅
bun run test        ✅  42 passed, 8 suites

No runtime/source (src/*.ts hook) behavior changes — this is test/build/CI tooling only, so no changeset is included.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9fcd64a

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[Copilot]

🟡 Changes recommended

The useAccessibilityInfo tests’ addEventListener mock helper returns undefined, which can break hook effect cleanup that expects a subscription with .remove().

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR repairs the repository’s broken Jest test setup (React Native 0.78 / React 18), modernizes the hook test suites to supported testing-library APIs, and ensures the checks run in CI to prevent future silent breakages.

Changes:

• Fix Jest/Babel/test tooling incompatibilities (RN 0.78 preset, remove dead setup code, align react-test-renderer with React 18).
• Migrate hook tests from deprecated @testing-library/react-hooks to @testing-library/react-native (renderHook, waitFor, async act).
• Add a CI workflow that runs typecheck + lint + test on pushes and PRs.

File summaries

File	Description
src/useRefresh.test.ts	Migrates to @testing-library/react-native and uses async act for timer-driven refresh completion.
src/useLayout.test.ts	Updates hook test renderer import to @testing-library/react-native.
src/useKeyboard.test.ts	Updates hook test renderer import to @testing-library/react-native.
src/useInteractionManager.test.ts	Updates hook test renderer import to @testing-library/react-native.
src/useImageDimensions.test.ts	Updates hook test renderer import to @testing-library/react-native.
src/useBackHandler.test.ts	Updates hook test renderer import to @testing-library/react-native.
src/useAppState.test.ts	Updates hook test renderer import to @testing-library/react-native.
src/useAccessibilityInfo.test.ts	Migrates async update waiting to waitFor with RTL native renderHook.
package.json	Removes deprecated test dependency, aligns react-test-renderer, adds missing eslint-plugin-react.
jest.setup.js	Removes dead RN renderer require, removes global.window shim, improves Keyboard mock to be event-driven.
bun.lock	Updates lockfile for dependency removals/additions and version alignment.
babel.config.js	Switches preset to @react-native/babel-preset compatible with RN 0.78+.
.github/workflows/ci.yml	Adds CI job to run typecheck, lint, and Jest on push/PR.

Review details

• Files reviewed: 12/13 changed files
• Comments generated: 1
• Review effort level: Lite

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[Copilot]

🔵 Needs a closer look

A couple of updated tests mock React Native APIs without returning the cleanup handles (remove/cancel) that the hooks call, which can cause runtime errors during unmount/cleanup and should be corrected before approval.

Review details

Suppressed comments (2)

src/useAppState.test.ts:5

• AppState.addEventListener is mocked without returning the subscription object, but useAppState calls subscription.remove() in its effect cleanup. This mock can cause runtime errors during unmount/cleanup and doesn’t reflect the real API; return { remove: ... } from the mock and from mockImplementationOnce.

import { act, renderHook } from "@testing-library/react-native"
import { AppState, AppStateStatus } from "react-native"
import { useAppState } from "./useAppState"

jest.mock("react-native", () => ({

src/useInteractionManager.test.ts:6

• InteractionManager.runAfterInteractions is mocked without returning the cancellable handle, but useInteractionManager calls interactionPromise.cancel() in its effect cleanup. This mock can cause runtime errors during unmount/cleanup and doesn’t reflect the real API; return an object with cancel both in the default mock and the per-test mockImplementationOnce.

import { act, renderHook } from "@testing-library/react-native"
import { InteractionManager } from "react-native"

jest.mock("react-native", () => ({
	InteractionManager: {

• Files reviewed: 12/13 changed files
• Comments generated: 0 new
• Review effort level: Lite

[Copilot]

🟢 Approval recommended

The updates are consistent with RN 0.78/React 18 tooling expectations and the CI addition directly enforces the intended test/lint/typecheck guarantees going forward.

Review details

• Files reviewed: 12/13 changed files
• Comments generated: 0 new
• Review effort level: Lite

[Copilot]

🟢 Approval recommended

The changes are consistent with the PR’s stated goals and appear complete, low-risk, and self-validating via CI-enabled typecheck/lint/test execution.

Review details

• Files reviewed: 12/13 changed files
• Comments generated: 0 new
• Review effort level: Lite