End-to-End Testing (Future)
Relevant source files
The following files were used as context for generating this wiki page:This document outlines a potential strategy for implementing End-to-End (E2E) testing for the TAF-SAF project. The project is a Next.js application built with React and TypeScript. Currently, no E2E testing framework or configuration is present. This guide analyzes the existing application structure to propose a foundational approach for future E2E test implementation.
The primary goal of E2E testing will be to simulate user journeys and verify the integrity of the application's key components, from the user interface to the underlying Next.js framework behavior. The initial focus for testing would be the main entry point of the application, src/app/page.tsx, and its surrounding layout defined in src/app/layout.tsx.
Current Application Architecture
The application is a standard Next.js project. Understanding its structure is key to defining effective E2E test cases.
- Framework: Next.js 15.3.2
- UI Library: React 19.0.0
- Language: TypeScript 5
- Styling: Tailwind CSS 4
The project is started using the npm run dev command, which makes the application available at http://localhost:3000. This will be the target URL for E2E tests running in a local development environment.
Sources: package.json:3-15, README.md:5-11
Key Components for Testing
The following components are the primary candidates for initial E2E testing:
| Component/File | Path | Description | Testable Elements |
|---|---|---|---|
| RootLayout | src/app/layout.tsx | The root layout component that wraps all pages. It defines the <html> and <body> tags and loads global fonts and styles. | Document structure, language attribute (lang="en"), font classes, and correct rendering of child components. |
| Home | src/app/page.tsx | The main landing page of the application. | Presence of images (next.svg, vercel.svg), text content, and functionality of external links. |
| Global Styles | src/app/globals.css | Defines global CSS variables and imports Tailwind CSS. | Correct application of background/foreground colors and fonts. Could be used for future visual regression testing. |
Sources: src/app/layout.tsx, src/app/page.tsx, src/app/globals.css
Proposed E2E Test Flow
A typical E2E test would simulate a user visiting the home page and interacting with its elements. The following diagram illustrates a basic test case for the Home page.
This diagram shows the sequence of actions an E2E test would perform to validate the home page.
Testable User Interactions on page.tsx
The main page component contains several elements that can be targeted in E2E tests to verify their presence, attributes, and behavior.
| Element Description | Selector/Attribute Target | Expected Behavior |
|---|---|---|
| Next.js Logo | img[alt="Next.js logo"] | Element is visible and has src="/next.svg". |
| Vercel Deploy Link | a[href*="vercel.com/new"] | Element is visible and navigates to the Vercel deployment URL on click. |
| Next.js Docs Link | a[href*="nextjs.org/docs"] | Element is visible and navigates to the Next.js documentation on click. |
| Footer "Learn" Link | a[href*="nextjs.org/learn"] | Element is visible and navigates to the Next.js tutorial on click. |
Sources: src/app/page.tsx:10-16, 31-53, 56-70
Future Configuration
While no testing tools are currently installed, setting up an E2E suite will require modifications to the project configuration.
1. Package Dependencies
A testing framework (e.g., Playwright, Cypress) would need to be added to devDependencies in package.json.
// package.json
"devDependencies": {
"typescript": "^5",
"@types/node": "^20",
"@types/react": "^19",
"@types/react-dom": "^19",
"@tailwindcss/postcss": "^4",
"tailwindcss": "^4"
// Future: "playwright": "..." or "cypress": "..."
}
Sources: package.json:16-23
2. NPM Scripts
A new script should be added to package.json to execute the E2E tests.
// package.json
"scripts": {
"dev": "next dev --turbopack",
"build": "next build",
"start": "next start",
"lint": "next lint",
"test:e2e": "future-test-runner-command"
},
Sources: package.json:5-9
3. TypeScript Configuration
The tsconfig.json file may need to be updated to include the E2E test files in the TypeScript compilation context or to exclude them from the production build. The existing path alias @/* can be used within tests to simplify imports.
// tsconfig.json
"include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts" /*, "e2e/**/*.ts" */],
"exclude": ["node_modules"]
Sources: tsconfig.json:22-25, 19
4. Next.js Configuration
The next.config.ts file is currently empty but could be used to configure environment variables or build-time settings required for the testing environment.
Sources: next.config.ts
Summary
The TAF-SAF project, in its current state, is a clean Next.js application without any testing infrastructure. The path to implementing E2E testing involves selecting a suitable framework, adding it to the project's dependencies, and creating test scripts that target the application running at http://localhost:3000. The initial tests should focus on verifying the core components like RootLayout and the Home page, ensuring that all links, images, and primary content render as expected. This foundational setup will pave the way for more comprehensive user journey tests as the application grows.