🧪 [testing improvement] Add unit tests for backend authentication middleware by davidraehles · Pull Request #4 · The-Raedical-Co/secure-notes

davidraehles · 2026-02-18T19:29:50Z

🎯 What: The testing gap addressed was the lack of unit tests for the backend authentication middleware.
📊 Coverage: The new tests cover the following scenarios for the authenticateToken middleware:

Missing authorization header (401 response)
Missing token in authorization header (401 response)
Invalid token/verification error (403 response)
Valid token with invalid payload missing userId (403 response)
Valid token with correct payload (success, sets req.userId and calls next())
Additionally, tests for generateToken were added to ensure correct token creation.
✨ Result: Improved test coverage for a critical security component, ensuring that authentication logic remains robust and reliable.

PR created automatically by Jules for task 7652412391144490455 started by @davidraehles

…dleware - Installed vitest in the backend - Added "test" script to backend/package.json - Created backend/src/middleware/__tests__/auth.test.ts - Implemented tests for authenticateToken and generateToken - Verified tests pass and catch regressions Co-authored-by: davidraehles <6085055+davidraehles@users.noreply.github.com>

google-labs-jules · 2026-02-18T19:29:51Z

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Pull request overview

This PR adds comprehensive unit tests for the backend authentication middleware, addressing a critical testing gap in the security layer. The tests use Vitest as the testing framework and cover both the authenticateToken middleware and the generateToken utility function.

Changes:

Added unit tests for JWT authentication middleware covering 5 key scenarios: missing header, missing token, invalid token, invalid payload, and valid token
Added test for token generation functionality
Integrated Vitest testing framework with version 4.0.18 and added test script to package.json

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
backend/src/middleware/tests/auth.test.ts	New test file with comprehensive coverage of authentication middleware including edge cases and success scenarios
backend/package.json	Added vitest dependency and test script for running unit tests
backend/pnpm-lock.yaml	Lockfile update reflecting new vitest dependency and its transitive dependencies

Files not reviewed (1)

backend/pnpm-lock.yaml: Language not supported

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Copilot · 2026-02-18T19:32:49Z

+describe('authenticateToken middleware', () => {
+  let req: Partial<AuthRequest>;
+  let res: Partial<Response>;
+  let next: NextFunction;
+
+  beforeEach(() => {
+    req = {
+      headers: {},
+    };
+    res = {
+      status: vi.fn().mockReturnThis(),
+      json: vi.fn().mockReturnThis(),
+    };
+    next = vi.fn();
+    vi.clearAllMocks();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('should return 401 if no authorization header is present', () => {
+    authenticateToken(req as AuthRequest, res as Response, next);
+    expect(res.status).toHaveBeenCalledWith(401);
+    expect(res.json).toHaveBeenCalledWith({ message: 'Authentication required' });
+    expect(next).not.toHaveBeenCalled();
+  });
+
+  it('should return 401 if authorization header is present but no token', () => {
+    req.headers!['authorization'] = 'Bearer ';
+    authenticateToken(req as AuthRequest, res as Response, next);
+    expect(res.status).toHaveBeenCalledWith(401);
+    expect(res.json).toHaveBeenCalledWith({ message: 'Authentication required' });
+  });
+
+  it('should return 403 if token is invalid', () => {
+    req.headers!['authorization'] = 'Bearer invalid-token';
+
+    vi.spyOn(jwt, 'verify').mockImplementation((token, secret, callback: any) => {
+      callback(new Error('Invalid token'), null);
+    });
+
+    authenticateToken(req as AuthRequest, res as Response, next);
+
+    expect(res.status).toHaveBeenCalledWith(403);
+    expect(res.json).toHaveBeenCalledWith({ message: 'Invalid or expired token' });
+    expect(next).not.toHaveBeenCalled();
+  });
+
+  it('should return 403 if token payload is invalid (missing userId)', () => {
+    req.headers!['authorization'] = 'Bearer valid-token';
+
+    vi.spyOn(jwt, 'verify').mockImplementation((token, secret, callback: any) => {
+      callback(null, {}); // Decoded object missing userId
+    });
+
+    authenticateToken(req as AuthRequest, res as Response, next);
+
+    expect(res.status).toHaveBeenCalledWith(403);
+    expect(res.json).toHaveBeenCalledWith({ message: 'Invalid token payload' });
+    expect(next).not.toHaveBeenCalled();
+  });
+
+  it('should call next and set req.userId if token is valid', () => {
+    req.headers!['authorization'] = 'Bearer valid-token';
+    const userId = 'user-123';
+
+    vi.spyOn(jwt, 'verify').mockImplementation((token, secret, callback: any) => {
+      callback(null, { userId });
+    });
+
+    authenticateToken(req as AuthRequest, res as Response, next);
+
+    expect(req.userId).toBe(userId);
+    expect(next).toHaveBeenCalled();
+    expect(res.status).not.toHaveBeenCalled();
+  });
+});


The test suite doesn't cover the edge case where the authorization header doesn't follow the "Bearer TOKEN" format. For example, if a request sends just a token without the "Bearer " prefix (e.g., authorization: "some-token"), the current implementation would try to extract the token from split(' ')[1], which would be undefined. Consider adding a test case for malformed authorization headers that don't contain a space.

Added test case for malformed authorization header without Bearer prefix. Verifies that authHeader.split(' ')[1] returns undefined when there's no space, triggering the 401 response.

Added the requested test case for malformed authorization headers without the 'Bearer ' prefix. It verifies that such headers trigger a 401 response.

Copilot · 2026-02-18T19:32:50Z

+    expect(typeof token).toBe('string');
+
+    const decoded = jwt.decode(token) as any;
+    expect(decoded.userId).toBe(userId);


The test for generateToken doesn't verify that the token includes the expected expiration time. According to the implementation in auth.ts, tokens should have a 7-day expiration (expiresIn: '7d'). Consider adding an assertion to verify the decoded token contains the 'exp' field and that it represents approximately 7 days from now.

Suggested change

expect(decoded.userId).toBe(userId);

expect(decoded.userId).toBe(userId);

// Verify token has an expiration approximately 7 days from now

expect(decoded.exp).toBeDefined();

expect(typeof decoded.exp).toBe('number');

const nowInSeconds = Math.floor(Date.now() / 1000);

const sevenDaysInSeconds = 7 * 24 * 60 * 60;

const toleranceInSeconds = 10;

const expectedMinExp = nowInSeconds + sevenDaysInSeconds - toleranceInSeconds;

const expectedMaxExp = nowInSeconds + sevenDaysInSeconds + toleranceInSeconds;

expect(decoded.exp).toBeGreaterThanOrEqual(expectedMinExp);

expect(decoded.exp).toBeLessThanOrEqual(expectedMaxExp);

Added expiration assertions to the generateToken test. Now verifies that decoded.exp is defined and falls within a 10-second window of the expected 7-day expiry.

Added expiration assertions to the generateToken test as requested. It now confirms the token has a defined 'exp' claim and that it falls within the expected 7-day window.

…piry test cases

…re tests - Added test case for malformed authorization header (no Bearer prefix) - Added expiration assertions to generateToken test Co-authored-by: davidraehles <6085055+davidraehles@users.noreply.github.com>

…6-7-8-10-11-12-13-14 Merge PRs #1, #2, #3, #4, #5, #6, #7, #8, #10, #11, #12, #13, #14 into main

Copilot AI review requested due to automatic review settings February 18, 2026 19:29

Copilot started reviewing on behalf of davidraehles February 18, 2026 19:30 View session

Copilot AI reviewed Feb 18, 2026

View reviewed changes

OpenCode and others added 2 commits February 18, 2026 21:17

fix: address review feedback - add malformed auth header and token ex…

e9f3b51

…piry test cases

davidraehles mentioned this pull request Feb 18, 2026

Merge PRs #1, #2, #3, #4, #5, #6, #7, #8, #10, #11, #12, #13, #14 into main #15

Merged

davidraehles merged commit 9f33ac4 into main Feb 18, 2026

davidraehles added a commit that referenced this pull request Feb 18, 2026

Merge pull request #15 from davidraehles/combine/merge-prs-1-2-3-4-5-…

70243bb

…6-7-8-10-11-12-13-14 Merge PRs #1, #2, #3, #4, #5, #6, #7, #8, #10, #11, #12, #13, #14 into main

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🧪 [testing improvement] Add unit tests for backend authentication middleware#4

🧪 [testing improvement] Add unit tests for backend authentication middleware#4
davidraehles merged 3 commits intomainfrom
testing-improvement-auth-middleware-7652412391144490455

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-    expect(decoded.userId).toBe(userId);
+    expect(decoded.userId).toBe(userId);
+    // Verify token has an expiration approximately 7 days from now
+    expect(decoded.exp).toBeDefined();
+    expect(typeof decoded.exp).toBe('number');
+    const nowInSeconds = Math.floor(Date.now() / 1000);
+    const sevenDaysInSeconds = 7 * 24 * 60 * 60;
+    const toleranceInSeconds = 10;
+    const expectedMinExp = nowInSeconds + sevenDaysInSeconds - toleranceInSeconds;
+    const expectedMaxExp = nowInSeconds + sevenDaysInSeconds + toleranceInSeconds;
+    expect(decoded.exp).toBeGreaterThanOrEqual(expectedMinExp);
+    expect(decoded.exp).toBeLessThanOrEqual(expectedMaxExp);

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