Testing - lesson 1 | HackIndia Skills

Testing - lesson 1 | HackIndia Skills | HackIndia

Example

Tiny test plan

Before writing test code, write a plain test plan in your repo. This keeps you focused when you add Jest, Pytest, Vitest, or any other tool later.

Feature: expense split

User action: Create a group expense

Worth testing:
1. Happy path
   Given amount = 900 and members = 3
   Expect each member share = 300

2. Rounding rule
   Given amount = 100 and members = 3
   Expect total assigned shares still equals 100

3. Invalid input
   Given amount = -50
   Expect the app rejects the expense

Not testing now:
- Button colour
- Exact wording of heading
- Animation timing

Tip

Use AI carefully

You can ask ChatGPT, Gemini, or Claude to suggest test cases. Give it your feature, inputs, rules, and edge cases.

Check the answer. AI often suggests too many tests, tests private implementation, or ignores Indian product rules like rupee rounding, phone number format, or UPI-style flows.

Prompt:
I am building a college expense split app.
Feature: create expense.
Rules: amount is in rupees, members must be at least 2, shares must add up to the original amount.
Suggest 6 meaningful test cases.
Separate happy path, edge cases, and invalid input.
Do not suggest UI colour or layout tests.

Pick what is worth testing

Test behaviour

What counts as worth testing

Find test ideas

Tiny test plan

Do not test everything

Use AI carefully

Do this now

Quick check