🧪 Add test coverage for the OAuth flow

[0GiS0]

🔍 Issue

The project currently has no automated tests. The package.json includes only a placeholder test script:

"test": "echo \"Error: no test specified\" && exit 1"

For a demo/educational project about OAuth 2.0 Device Code Flow, having tests would:

• Ensure the implementation remains correct as dependencies are updated
• Serve as executable documentation of the expected behavior
• Make it easier for contributors to understand the flow
• Catch regressions when making changes

💡 Proposed Solution

1. Add Testing Dependencies

npm install --save-dev jest supertest nock

• jest - Testing framework
• supertest - HTTP assertions for Express
• nock - HTTP mocking for external API calls

2. Update package.json

"scripts": {
  "start": "nodemon --inspect ./server.js | bunyan",
  "test": "jest",
  "test:watch": "jest --watch",
  "test:coverage": "jest --coverage"
},
"jest": {
  "testEnvironment": "node",
  "coveragePathIgnorePatterns": ["/node_modules/"]
}

3. Create Test Files

server.test.js - Test the main routes:

• GET / - Should render index page
• GET /get/the/code - Should request device code from Azure AD
• POST /checking - Should poll for token
• GET /access/token - Should display access token
• POST /call/ms/graph - Should call Microsoft Graph API

Example test:

const request = require("supertest");
const nock = require("nock");
const app = require("./server");

describe("OAuth Device Code Flow", () => {
  test("GET / should render index page", async () => {
    const response = await request(app).get("/");
    expect(response.status).toBe(200);
    expect(response.text).toContain("OAuth 2.0 - Device Code Flow");
  });

  test("GET /get/the/code should request device code", async () => {
    nock("https://login.microsoftonline.com")
      .post(/\/oauth2\/v2.0\/devicecode/)
      .reply(200, {
        device_code: "TEST_DEVICE_CODE",
        user_code: "TEST123",
        verification_uri: "https://microsoft.com/devicelogin",
        expires_in: 900,
        interval: 5,
        message: "To sign in, use a web browser..."
      });

    const response = await request(app).get("/get/the/code");
    expect(response.status).toBe(200);
    expect(response.text).toContain("TEST123");
  });
});

🎯 Benefits

• Quality Assurance - Catch bugs before they reach users
• Refactoring Confidence - Make changes safely with test coverage
• Documentation - Tests serve as living examples of how the code works
• Educational Value - Learners can see how to test OAuth flows
• CI/CD Ready - Can integrate with GitHub Actions for automated testing

🔄 Alternative Approach

If full E2E testing is desired, consider:

• Playwright or Puppeteer for browser automation
• Azure AD Test Tenant with test users for integration tests

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