Add optional name + docs (#25)

* Add optional name

* docs: add README.md with project documentation

README.md

@@ -0,0 +1,81 @@
+# TP CI/CD
+
+A Node.js application providing a simple greeting service with a REST API. It includes a server built with Express, greeting logic, and comprehensive test
+suites (unit, integration, and end-to-end).
+
+## Features
+
+- **Greeting Functionality**: Generates personalized greetings via `src/greeting.js`.
+- **REST API Server**: Built with Express in `src/server.js`, supporting GET and POST endpoints for greetings.
+- **Testing**: Full test coverage with Jest:
+  - Unit tests in `tests/unit/greeting.test.js`.
+  - Integration tests in `tests/integration/app.test.js`.
+  - End-to-end tests in `tests/e2e/e2e.test.js`.
+- **Linting**: Configured with ESLint (via `.eslintrc.js` and `.eslintignore`).
+- **Node.js Version Management**: Uses `.nvmrc` to specify Node.js v22.19.0.
+
+## Prerequisites
+
+- Node.js ≥22.19.0 (use `.nvmrc` with nvm: `nvm use`).
+- npm (included with Node.js).
+
+## Installation
+
+1. Fork the repository:
+2. Install dependencies:
+
+```
+npm install
+```
+
+## Usage
+
+Start the server:
+
+```
+npm start
+```
+
+The server runs on port 3000 (or `process.env.PORT`). Endpoints:
+
+- `GET /hello/:name?`: Returns a greeting (e.g., "Hello world!" or "Hello world! From [name]").
+- `POST /hello`: Expects `x-name` header for the name.
+
+## Testing
+
+Run tests with Jest:
+
+- All tests: `npm test`
+- Unit tests: `npm run test:unit` (if defined; otherwise, use `npm test -- tests/unit/`)
+- Integration tests: `npm run test:integration` (if defined; otherwise, use `npm test -- tests/integration/`)
+- E2E tests: `npm run test:e2e` (if defined; otherwise, use `npm test -- tests/e2e/`)
+
+## Linting
+
+Check code quality:
+
+```
+npm run lint
+```
+
+## Project Structure
+
+- `src/greeting.js`: Core greeting logic.
+- `src/server.js`: Express server setup.
+- `tests/`: Test suites (unit, integration, e2e).
+- `.eslintrc.js`: ESLint configuration.
+- `.eslintignore`: Files/directories excluded from linting.
+- `.nvmrc`: Node.js version specification.
+- `package.json`: Project metadata, dependencies, and scripts.
+
+## Dependencies
+
+- **Runtime**: Express (web server), Axios (HTTP client), Supertest (testing utility).
+- **Dev**: ESLint (linting), Jest (testing).
+
+## Contributing
+
+1. Fork the repo.
+2. Create a feature branch.
+3. Run tests and linting.
+4. Submit a pull request.

package.json

@@ -4,7 +4,8 @@
   "private": true,
   "scripts": {
     "lint": "eslint .",
-    "test": "jest"
+    "test": "jest",
+    "start": "node src/server.js"
   },
   "dependencies": {
     "express": "^4.18.2",

src/greeting.js

@@ -1,5 +1,13 @@
-function getGreeting() {
-  return 'Hello world';
+function getGreeting(name) {
+  const greeting = `Hello world!`;
+
+  if (name) {
+    const wisher = `From ${name}`;
+
+    return `${greeting} ${wisher}`;
+  }
+
+  return greeting;
 }
 
 module.exports = { getGreeting };

src/server.js

@@ -1,11 +1,19 @@
-const express = require('express');
-const { getGreeting } = require('./greeting');
+const express = require("express");
+const { getGreeting } = require("./greeting");
 
 const app = express();
 const PORT = process.env.PORT || 3000;
 
-app.get('/hello', (req, res) => {
-  res.send(getGreeting());
+app.get("/hello/:name?", (req, res) => {
+  const name = req.params.name;
+
+  res.send(getGreeting(name));
+});
+
+app.post("/hello", (req, res) => {
+  const name = req.headers["x-name"];
+
+  res.send(getGreeting(name));
 });
 
 if (require.main === module) {

tests/e2e/e2e.test.js

@@ -1,9 +1,9 @@
-const axios = require('axios');
-const app = require('../../src/server');
+const axios = require("axios");
+const app = require("../../src/server");
 let server;
 let baseURL;
 
-beforeAll(done => {
+beforeAll((done) => {
   server = app.listen(0, () => {
     const { port } = server.address();
     baseURL = `http://127.0.0.1:${port}`;
@@ -11,14 +11,14 @@ beforeAll(done => {
   });
 });
 
-afterAll(done => {
+afterAll((done) => {
   server.close(done);
 });
 
-describe('E2E GET /hello', () => {
-  it('responds with Hello world', async () => {
+describe("E2E GET /hello", () => {
+  it("responds with Hello world", async () => {
     const res = await axios.get(`${baseURL}/hello`);
     expect(res.status).toBe(200);
-    expect(res.data).toBe('Hello world');
+    expect(res.data).toBe("Hello world!");
   });
 });

tests/integration/app.test.js

@@ -1,10 +1,10 @@
-const request = require('supertest');
-const app = require('../../src/server');
+const request = require("supertest");
+const app = require("../../src/server");
 
-describe('GET /hello', () => {
-  it('should return Hello world', async () => {
-    const res = await request(app).get('/hello');
+describe("GET /hello", () => {
+  it("should return Hello world", async () => {
+    const res = await request(app).get("/hello");
     expect(res.statusCode).toBe(200);
-    expect(res.text).toBe('Hello world');
+    expect(res.text).toBe("Hello world!");
   });
 });

tests/unit/greeting.test.js

@@ -1,7 +1,7 @@
-const { getGreeting } = require('../../src/greeting');
+const { getGreeting } = require("../../src/greeting");
 
-describe('getGreeting', () => {
-  it('returns the hello world message', () => {
-    expect(getGreeting()).toBe('Hello world');
+describe("getGreeting", () => {
+  it("returns the hello world message", () => {
+    expect(getGreeting()).toBe("Hello world!");
   });
 });