Write Unit Tests for register.ts API Route

[Sallin142]

Description:

• Develop unit tests for the register.ts API route to ensure it handles registration logic correctly.

Subtasks:

• [x] Create src/app/auth/api/onboard/register.test.ts.
• [x] Write tests to verify successful registration, duplicate email handling, and error handling.
• [ ] Input: Valid and duplicate email/password combinations.
• [ ] Output: 200 for successful registration, 400 for duplicate emails.

Reference: API Documentation

Endpoint: POST /auth/register Inputs: { "email": "test@example.com", "password": "password123" }

Outputs: { "status": "success", "data": { "user": { "id": "123" } }, "message": "Registration successful" } { "status": "error", "error": { "code": 400, "message": "Duplicate email" } }