Informal Testing

1. Run the program
2. Pick some inputs
3. See what happens
4. Fix errors as they are found

Formal Testing

1. Develop a Test Plan
   • List Inputs & Expected Results
   • Look for Edge Cases & Coverage
2. Execute Tests
3. Automate?

Waterfall Method

Image Credit: Wikipedia

Test Early
Test Often

Automated Testing

• Unit Tests
• Integration Tests
• System Tests