Add comprehensive component tests

.github/workflows/tests.yml

@@ -16,4 +16,6 @@ jobs:
       - run: pnpm lint:check
       - run: pnpm format:check
       - run: pnpm type:check
+      - run: pnpm test
       - run: pnpm build
+      - run: pnpm test:e2e

package.json

@@ -23,7 +23,10 @@
     "format": "prettier --write \"src/**/*.{ts,tsx}\"",
     "format:check": "prettier --check \"src/**/*.{ts,tsx}\"",
     "type:check": "tsc --noEmit",
-    "ci": "pnpm lint:check && pnpm format:check && pnpm type:check && pnpm build && pnpm docker:build"
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:e2e": "playwright test",
+    "ci": "pnpm lint:check && pnpm format:check && pnpm type:check && pnpm test && pnpm build && pnpm test:e2e && pnpm docker:build"
   },
   "repository": {
     "type": "git",
@@ -33,6 +36,7 @@
     "url": "https://github.com/kern/filepizza/issues"
   },
   "dependencies": {
+    "@tailwindcss/postcss": "^4.1.11",
     "@tanstack/react-query": "^5.55.2",
     "autoprefixer": "^10.4.20",
     "debug": "^4.3.6",
@@ -51,26 +55,35 @@
     "react-qr-code": "^2.0.15",
     "streamsaver": "^2.0.6",
     "tailwindcss": "^4.1.11",
-    "@tailwindcss/postcss": "^4.1.11",
     "web-streams-polyfill": "^4.0.0",
     "webrtcsupport": "^2.2.0",
     "zod": "^3.23.8"
   },
   "devDependencies": {
+    "@eslint/js": "^9.30.0",
+    "@playwright/test": "^1.53.2",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/react": "^16.3.0",
+    "@testing-library/user-event": "^14.6.1",
     "@types/debug": "^4.1.12",
     "@types/node": "^22.10.2",
     "@types/react": "^19.0.2",
     "@typescript-eslint/eslint-plugin": "^8.18.2",
     "@typescript-eslint/parser": "^8.18.2",
+    "@vitejs/plugin-react": "^4.6.0",
+    "@vitest/coverage-v8": "^3.2.4",
     "eslint": "^9.17.0",
     "eslint-config-next": "^15.1.3",
     "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-react": "^7.37.3",
     "husky": "^9.0.0",
+    "jsdom": "^26.1.0",
     "lint-staged": "^15.0.0",
+    "playwright": "^1.53.2",
     "prettier": "^3.0.0",
     "typescript": "^5.0.0",
-    "typescript-eslint": "^8.18.2"
+    "typescript-eslint": "^8.18.2",
+    "vitest": "^3.2.4"
   },
   "husky": {
     "hooks": {

playwright.config.ts

@@ -0,0 +1,11 @@
+import { defineConfig } from '@playwright/test'
+
+export default defineConfig({
+  testDir: './tests/e2e',
+  webServer: {
+    command: 'node .next/standalone/server.js',
+    port: 3000,
+    timeout: 120 * 1000,
+    reuseExistingServer: true,
+  },
+})

tests/e2e/basic.test.ts

@@ -0,0 +1,9 @@
+/// <reference types="@playwright/test" />
+import { test, expect } from '@playwright/test'
+
+test('home page loads', async ({ page }) => {
+  await page.goto('http://localhost:3000/')
+  await expect(
+    page.getByText('Peer-to-peer file transfers in your browser.'),
+  ).toBeVisible()
+})

tests/unit/CancelButton.test.tsx

@@ -0,0 +1,14 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import CancelButton from '../../src/components/CancelButton'
+
+describe('CancelButton', () => {
+  it('calls onClick when clicked', () => {
+    const onClick = vi.fn()
+    const { getByText } = render(<CancelButton onClick={onClick} />)
+    fireEvent.click(getByText('Cancel'))
+    expect(onClick).toHaveBeenCalled()
+  })
+})

tests/unit/ConnectionListItem.test.tsx

@@ -0,0 +1,25 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import { ConnectionListItem } from '../../src/components/ConnectionListItem'
+import { UploaderConnectionStatus } from '../../src/types'
+
+const baseConn = {
+  status: UploaderConnectionStatus.Uploading,
+  dataConnection: {} as any,
+  completedFiles: 1,
+  totalFiles: 2,
+  currentFileProgress: 0.5,
+  browserName: 'Chrome',
+  browserVersion: '120',
+}
+
+describe('ConnectionListItem', () => {
+  it('shows status and progress', () => {
+    const { getByText } = render(<ConnectionListItem conn={baseConn} />)
+    expect(getByText((c, e) => e?.textContent === 'Chrome v120')).toBeInTheDocument()
+    expect(getByText('UPLOADING')).toBeInTheDocument()
+    expect(getByText('Completed: 1 / 2 files')).toBeInTheDocument()
+  })
+})

tests/unit/CopyableInput.test.tsx

@@ -0,0 +1,22 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { act } from 'react'
+import { describe, it, expect, vi } from 'vitest'
+import { CopyableInput } from '../../src/components/CopyableInput'
+
+Object.assign(navigator, {
+  clipboard: {
+    writeText: vi.fn().mockResolvedValue(undefined),
+  },
+})
+
+describe('CopyableInput', () => {
+  it('copies text when button clicked', async () => {
+    const { getByText } = render(<CopyableInput label="URL" value="hello" />)
+    await act(async () => {
+      fireEvent.click(getByText('Copy'))
+    })
+    expect(navigator.clipboard.writeText).toHaveBeenCalledWith('hello')
+  })
+})

tests/unit/DownloadButton.test.tsx

@@ -0,0 +1,14 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import DownloadButton from '../../src/components/DownloadButton'
+
+describe('DownloadButton', () => {
+  it('calls onClick', () => {
+    const fn = vi.fn()
+    const { getByText } = render(<DownloadButton onClick={fn} />)
+    fireEvent.click(getByText('Download'))
+    expect(fn).toHaveBeenCalled()
+  })
+})

tests/unit/Downloader.subcomponents.test.tsx

@@ -0,0 +1,60 @@
+/// <reference types="@testing-library/jest-dom" />
+import { vi } from 'vitest'
+vi.mock('next-view-transitions', () => ({ Link: (p: any) => <a {...p}>{p.children}</a> }))
+import React from 'react'
+import { render, fireEvent, waitFor } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import {
+  ConnectingToUploader,
+  DownloadComplete,
+  DownloadInProgress,
+  ReadyToDownload,
+  PasswordEntry,
+} from '../../src/components/Downloader'
+
+const files = [{ fileName: 'a.txt', size: 1, type: 'text/plain' }]
+
+describe('Downloader subcomponents', () => {
+  it('ConnectingToUploader shows troubleshooting', async () => {
+    const { getByText } = render(
+      <ConnectingToUploader showTroubleshootingAfter={0} />,
+    )
+    await waitFor(() => {
+      expect(getByText('Having trouble connecting?')).toBeInTheDocument()
+    })
+  })
+
+  it('DownloadComplete lists files', () => {
+    const { getByText } = render(
+      <DownloadComplete filesInfo={files} bytesDownloaded={1} totalSize={1} />,
+    )
+    expect(getByText('You downloaded 1 file.')).toBeInTheDocument()
+  })
+
+  it('DownloadInProgress shows stop button', () => {
+    const { getByText } = render(
+      <DownloadInProgress filesInfo={files} bytesDownloaded={0} totalSize={1} onStop={() => {}} />,
+    )
+    expect(getByText('Stop Download')).toBeInTheDocument()
+  })
+
+  it('ReadyToDownload shows start button', () => {
+    const { getByText } = render(
+      <ReadyToDownload filesInfo={files} onStart={() => {}} />,
+    )
+    expect(getByText('Download')).toBeInTheDocument()
+  })
+
+  it('PasswordEntry submits value', () => {
+    let submitted = ''
+    const { getByPlaceholderText, getByText } = render(
+      <PasswordEntry errorMessage={null} onSubmit={(v) => (submitted = v)} />,
+    )
+    fireEvent.change(
+      getByPlaceholderText('Enter a secret password for this slice of FilePizza...'),
+      { target: { value: 'secret' } },
+    )
+    fireEvent.submit(getByText('Unlock'))
+    expect(submitted).toBe('secret')
+  })
+})

tests/unit/DropZone.test.tsx

@@ -0,0 +1,19 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import DropZone from '../../src/components/DropZone'
+
+function createFile(name: string) {
+  return new File(['hello'], name, { type: 'text/plain' })
+}
+
+describe('DropZone', () => {
+  it('calls onDrop when file selected', () => {
+    const fn = vi.fn()
+    const { container } = render(<DropZone onDrop={fn} />)
+    const input = container.querySelector('input') as HTMLInputElement
+    fireEvent.change(input, { target: { files: [createFile('a.txt')] } })
+    expect(fn).toHaveBeenCalled()
+  })
+})

tests/unit/ErrorMessage.test.tsx

@@ -0,0 +1,12 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import { ErrorMessage } from '../../src/components/ErrorMessage'
+
+describe('ErrorMessage', () => {
+  it('renders message', () => {
+    const { getByText } = render(<ErrorMessage message="oops" />)
+    expect(getByText('oops')).toBeInTheDocument()
+  })
+})

tests/unit/Footer.test.tsx

@@ -0,0 +1,18 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import Footer from '../../src/components/Footer'
+
+Object.defineProperty(window, 'location', {
+  value: { href: '' },
+  writable: true,
+})
+
+describe('Footer', () => {
+  it('redirects to donate link', () => {
+    const { getByText } = render(<Footer />)
+    fireEvent.click(getByText('Donate'))
+    expect(window.location.href).toContain('coinbase')
+  })
+})

tests/unit/InputLabel.test.tsx

@@ -0,0 +1,16 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import InputLabel from '../../src/components/InputLabel'
+
+describe('InputLabel', () => {
+  it('shows tooltip on hover', () => {
+    const { getByRole, getByText } = render(
+      <InputLabel tooltip="tip">Label</InputLabel>,
+    )
+    const button = getByRole('button')
+    fireEvent.mouseOver(button)
+    expect(getByText('tip')).toBeInTheDocument()
+  })
+})

tests/unit/Loading.test.tsx

@@ -0,0 +1,12 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import Loading from '../../src/components/Loading'
+
+describe('Loading', () => {
+  it('renders text', () => {
+    const { getByText } = render(<Loading text="wait" />)
+    expect(getByText('wait')).toBeInTheDocument()
+  })
+})

tests/unit/ModeToggle.test.tsx

@@ -0,0 +1,16 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import { ModeToggle } from '../../src/components/ModeToggle'
+
+const setTheme = vi.fn()
+vi.mock('next-themes', () => ({ useTheme: () => ({ setTheme, resolvedTheme: 'light' }) }))
+
+describe('ModeToggle', () => {
+  it('toggles theme', () => {
+    const { getByRole } = render(<ModeToggle />)
+    fireEvent.click(getByRole('button'))
+    expect(setTheme).toHaveBeenCalledWith('dark')
+  })
+})

tests/unit/PasswordField.test.tsx

@@ -0,0 +1,18 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import PasswordField from '../../src/components/PasswordField'
+
+describe('PasswordField', () => {
+  it('calls onChange', () => {
+    let val = ''
+    const { getByPlaceholderText } = render(
+      <PasswordField value="" onChange={(v) => (val = v)} />,
+    )
+    fireEvent.change(getByPlaceholderText('Enter a secret password for this slice of FilePizza...'), {
+      target: { value: 'a' },
+    })
+    expect(val).toBe('a')
+  })
+})

tests/unit/ProgressBar.test.tsx

@@ -0,0 +1,12 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import ProgressBar from '../../src/components/ProgressBar'
+
+describe('ProgressBar', () => {
+  it('shows percentage', () => {
+    const { getAllByText } = render(<ProgressBar value={50} max={100} />)
+    expect(getAllByText('50%').length).toBeGreaterThan(0)
+  })
+})

tests/unit/QueryClientProvider.test.tsx

@@ -0,0 +1,16 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import FilePizzaQueryClientProvider from '../../src/components/QueryClientProvider'
+
+describe('QueryClientProvider', () => {
+  it('renders children', () => {
+    const { getByText } = render(
+      <FilePizzaQueryClientProvider>
+        <span>child</span>
+      </FilePizzaQueryClientProvider>,
+    )
+    expect(getByText('child')).toBeInTheDocument()
+  })
+})

tests/unit/ReportTermsViolationButton.test.tsx

@@ -0,0 +1,23 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import FilePizzaQueryClientProvider from '../../src/components/QueryClientProvider'
+
+vi.mock('../../src/components/WebRTCProvider', () => ({
+  useWebRTCPeer: () => ({ peer: { connect: vi.fn(() => ({ on: vi.fn(), close: vi.fn() })) } }),
+}))
+
+import ReportTermsViolationButton from '../../src/components/ReportTermsViolationButton'
+
+describe('ReportTermsViolationButton', () => {
+  it('opens modal on click', () => {
+    const { getByText } = render(
+      <FilePizzaQueryClientProvider>
+        <ReportTermsViolationButton uploaderPeerID="peer" slug="slug" />
+      </FilePizzaQueryClientProvider>,
+    )
+    fireEvent.click(getByText('Report suspicious pizza delivery'))
+    expect(getByText('Found a suspicious delivery?')).toBeInTheDocument()
+  })
+})

tests/unit/ReturnHome.test.tsx

@@ -0,0 +1,14 @@
+/// <reference types="@testing-library/jest-dom" />
+vi.mock("next-view-transitions", () => ({ Link: (p: any) => <a {...p}>{p.children}</a> }))
+import { vi } from "vitest"
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import ReturnHome from '../../src/components/ReturnHome'
+
+describe('ReturnHome', () => {
+  it('links to home', () => {
+    const { getByText } = render(<ReturnHome />)
+    expect(getByText(/Serve up/).getAttribute('href')).toBe('/')
+  })
+})

tests/unit/Spinner.test.tsx

@@ -0,0 +1,19 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { act } from 'react'
+import { describe, it, expect } from 'vitest'
+import Spinner from '../../src/components/Spinner'
+import { setRotating } from '../../src/hooks/useRotatingSpinner'
+
+describe('Spinner', () => {
+  it('reflects rotating state', () => {
+    // @ts-ignore
+    act(() => { setRotating(true) })
+// @ts-ignore
+    const { getByLabelText } = render(<Spinner />)
+    expect(getByLabelText('Rotating pizza')).toBeInTheDocument()
+    // @ts-ignore
+    act(() => { setRotating(false) })
+  })
+})

tests/unit/StartButton.test.tsx

@@ -0,0 +1,14 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import StartButton from '../../src/components/StartButton'
+
+describe('StartButton', () => {
+  it('calls handler', () => {
+    const fn = vi.fn()
+    const { getByText } = render(<StartButton onClick={fn} />)
+    fireEvent.click(getByText('Start'))
+    expect(fn).toHaveBeenCalled()
+  })
+})

tests/unit/StopButton.test.tsx

@@ -0,0 +1,19 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import StopButton from '../../src/components/StopButton'
+
+describe('StopButton', () => {
+  it('labels correctly when downloading', () => {
+    const { getByText } = render(<StopButton onClick={() => {}} isDownloading />)
+    expect(getByText('Stop Download')).toBeInTheDocument()
+  })
+
+  it('calls handler', () => {
+    const fn = vi.fn()
+    const { getByText } = render(<StopButton onClick={fn} />)
+    fireEvent.click(getByText('Stop Upload'))
+    expect(fn).toHaveBeenCalled()
+  })
+})

tests/unit/TermsAcceptance.test.tsx

@@ -0,0 +1,13 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import TermsAcceptance from '../../src/components/TermsAcceptance'
+
+describe('TermsAcceptance', () => {
+  it('opens modal', () => {
+    const { getByText } = render(<TermsAcceptance />)
+    fireEvent.click(getByText('our terms'))
+    expect(getByText('FilePizza Terms')).toBeInTheDocument()
+  })
+})

tests/unit/ThemeProvider.test.tsx

@@ -0,0 +1,17 @@
+/// <reference types="@testing-library/jest-dom" />
+Object.defineProperty(window, "matchMedia", { value: () => ({ matches: false, addListener: () => {}, removeListener: () => {} }) })
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import { ThemeProvider } from '../../src/components/ThemeProvider'
+
+describe('ThemeProvider', () => {
+  it('renders children', () => {
+    const { getByText } = render(
+      <ThemeProvider>
+        <span>child</span>
+      </ThemeProvider>,
+    )
+    expect(getByText('child')).toBeInTheDocument()
+  })
+})

tests/unit/TitleText.test.tsx

@@ -0,0 +1,12 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import TitleText from '../../src/components/TitleText'
+
+describe('TitleText', () => {
+  it('renders children', () => {
+    const { getByText } = render(<TitleText>hello</TitleText>)
+    expect(getByText('hello')).toBeInTheDocument()
+  })
+})

tests/unit/TypeBadge.test.tsx

@@ -0,0 +1,12 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import TypeBadge from '../../src/components/TypeBadge'
+
+describe('TypeBadge', () => {
+  it('renders type', () => {
+    const { getByText } = render(<TypeBadge type="image/png" />)
+    expect(getByText('image/png')).toBeInTheDocument()
+  })
+})

tests/unit/UnlockButton.test.tsx

@@ -0,0 +1,14 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import UnlockButton from '../../src/components/UnlockButton'
+
+describe('UnlockButton', () => {
+  it('calls onClick', () => {
+    const fn = vi.fn()
+    const { getByText } = render(<UnlockButton onClick={fn} />)
+    fireEvent.click(getByText('Unlock'))
+    expect(fn).toHaveBeenCalled()
+  })
+})

tests/unit/UploadFileList.test.tsx

@@ -0,0 +1,15 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import UploadFileList from '../../src/components/UploadFileList'
+
+describe('UploadFileList', () => {
+  it('calls onRemove', () => {
+    const fn = vi.fn()
+    const files = [{ fileName: 'a.txt', type: 'text/plain' }]
+    const { getByText } = render(<UploadFileList files={files} onRemove={fn} />)
+    fireEvent.click(getByText('✕'))
+    expect(fn).toHaveBeenCalledWith(0)
+  })
+})

tests/unit/Uploader.test.tsx

@@ -0,0 +1,35 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+
+var mockUseUploaderChannel: any
+
+vi.mock('../../src/components/WebRTCProvider', () => ({
+  useWebRTCPeer: () => ({ peer: { id: '1' }, stop: vi.fn() }),
+}))
+vi.mock('../../src/hooks/useUploaderChannel', () => ({
+  useUploaderChannel: (...args: any[]) => mockUseUploaderChannel(...args),
+}))
+vi.mock('../../src/hooks/useUploaderConnections', () => ({ useUploaderConnections: () => [] }))
+vi.mock('react-qr-code', () => ({ default: () => <div>QR</div> }))
+vi.mock('../../src/components/CopyableInput', () => ({ CopyableInput: () => <div>Input</div> }))
+vi.mock('../../src/components/ConnectionListItem', () => ({ ConnectionListItem: () => <div>Item</div> }))
+vi.mock('../../src/components/StopButton', () => ({ default: () => <button>Stop</button> }))
+
+import Uploader from '../../src/components/Uploader'
+
+describe('Uploader', () => {
+  it('shows loading when channel loading', () => {
+    mockUseUploaderChannel = vi.fn().mockReturnValueOnce({
+      isLoading: true,
+      error: null,
+      longSlug: undefined,
+      shortSlug: undefined,
+      longURL: undefined,
+      shortURL: undefined,
+    })
+    const { getByText } = render(<Uploader files={[]} password="" onStop={() => {}} />)
+    expect(getByText('Creating channel...')).toBeInTheDocument()
+  })
+})

tests/unit/WebRTCProvider.test.tsx

@@ -0,0 +1,24 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render, waitFor } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+
+vi.stubGlobal('fetch', vi.fn(() => Promise.resolve(new Response(JSON.stringify({ iceServers: [] })))) )
+vi.mock('peerjs', () => ({
+  default: class { id = 'peer1'; on(event: string, cb: (id: string) => void) { if (event === 'open') cb('peer1') } off() {} },
+}))
+
+import WebRTCProvider from '../../src/components/WebRTCProvider'
+
+const Child = () => <div>child</div>
+
+describe('WebRTCProvider', () => {
+  it('renders children after init', async () => {
+    const { getByText } = render(
+      <WebRTCProvider>
+        <Child />
+      </WebRTCProvider>,
+    )
+    await waitFor(() => expect(getByText('child')).toBeInTheDocument())
+  })
+})

tests/unit/Wordmark.test.tsx

@@ -0,0 +1,12 @@
+/// <reference types="@testing-library/jest-dom" />
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import Wordmark from '../../src/components/Wordmark'
+
+describe('Wordmark', () => {
+  it('renders svg', () => {
+    const { getByLabelText } = render(<Wordmark />)
+    expect(getByLabelText('FilePizza logo')).toBeInTheDocument()
+  })
+})

tests/unit/useRotatingSpinner.test.ts

@@ -0,0 +1,21 @@
+import { describe, it, expect, vi } from 'vitest'
+import {
+  setRotating,
+  addRotationListener,
+  removeRotationListener,
+  getRotating,
+} from '../../src/hooks/useRotatingSpinner'
+
+describe('useRotatingSpinner state helpers', () => {
+  it('notifies listeners on state change', () => {
+    const listener = vi.fn()
+    addRotationListener(listener)
+    setRotating(true)
+    expect(listener).toHaveBeenCalledWith(true)
+    expect(getRotating()).toBe(true)
+    setRotating(false)
+    expect(listener).toHaveBeenCalledWith(false)
+    expect(getRotating()).toBe(false)
+    removeRotationListener(listener)
+  })
+})

tsconfig.json

@@ -24,7 +24,11 @@
         "name": "next"
       }
     ],
-    "strictNullChecks": true
+    "strictNullChecks": true,
+    "types": [
+      "vitest/globals",
+      "@testing-library/jest-dom"
+    ]
   },
   "include": [
     "tailwind.config.js",
@@ -32,6 +36,8 @@
     "src/**/*.js",
     "src/**/*.ts",
     "src/**/*.tsx",
+    "tests/**/*.ts",
+    "tests/**/*.tsx",
     ".next/types/**/*.ts"
   ],
   "exclude": [

vitest.config.ts

@@ -0,0 +1,16 @@
+import react from '@vitejs/plugin-react'
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: './vitest.setup.ts',
+    exclude: ['tests/e2e/**', '**/node_modules/**'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'html'],
+    },
+  },
+})

vitest.setup.ts

@@ -0,0 +1 @@
+import '@testing-library/jest-dom'