4.2Test Suite Structure

Organize by Feature Area

Test Suites/
  Authentication/
    Login/
      TC-101: Login with valid credentials
      TC-102: Login with invalid password
      TC-103: Login with 2FA enabled
      TC-104: Login with expired session redirect
      TC-105: Login with social provider (Google, GitHub)
    Registration/
      TC-201: Register with valid data
      TC-202: Register with duplicate email
      TC-203: Register with weak password
      TC-204: Email verification flow
    Password Reset/
      TC-251: Request password reset
      TC-252: Reset with expired link
      TC-253: Reset with used link
  Checkout/
    Cart/
      TC-301: Add item to cart
      TC-302: Remove item from cart
      TC-303: Update quantity
      TC-304: Cart persists across sessions
    Payment/
      TC-401: Pay with credit card
      TC-402: Pay with PayPal
      TC-403: Apply valid coupon
      TC-404: Apply expired coupon (error handling)
      TC-405: Insufficient funds handling

Why Not Organize by Test Type?

# BAD: Organized by test type
Test Suites/
  Smoke Tests/
    Login smoke
    Checkout smoke
    Search smoke
  Regression Tests/
    Login regression
    Checkout regression
    Search regression
  Edge Cases/
    Login edge cases
    Checkout edge cases

This structure forces you to jump between folders when working on a single feature. It also makes it hard to answer "what tests cover checkout?" because they are scattered across three folders.