Testing Debugging

Even the best code has mistakes. Testing and debugging are the skills that help you find and fix problems quickly so your apps work reliably.

Think of testing as checking your work before showing it to others, and debugging as detective work when something goes wrong.

Why Testing and Debugging Matter

Bugs frustrate users and waste time. Good testing catches problems early. Good debugging helps you fix them fast. These skills separate beginners from developers who build trustworthy applications.

Types of Testing

Unit Testing

Testing small pieces of code (like a single function) in isolation to make sure they work correctly.

Integration Testing

Checking that different parts of your app work together properly — for example, your frontend talking to your backend and database.

End-to-End Testing

Testing the full user flow, like signing up, logging in, and completing an action.

Debugging Tools

Common tools beginners use include:

• Browser Developer Tools (Console and Sources tabs)
• console.log() for quick checks
• VS Code debugger with breakpoints

Getting Started

Start small. Write a simple function in your Live Coding section and test it manually first. Then try adding a few console.log() statements to see what’s happening step by step.

As you grow, explore simple testing libraries like Jest (for JavaScript) or pytest (for Python).

Next Steps

Take one of your existing Live Coding projects and intentionally add a small bug. Practice finding and fixing it using console logs and breakpoints.

Try writing one basic test for a function — even a simple check like “does this button click work?” counts as progress.

Learning to test and debug confidently will save you hours of frustration and make your projects much more professional.