Types of Testing in JavaScript

Testing is not just one activity — it includes different types of checks that help ensure software quality.

Each type of testing focuses on a different level of your application, from small functions to full user workflows.

Understanding these testing types helps developers choose the right approach to catch bugs early and build reliable applications.

Main Types of Testing in JavaScript

1. Manual Testing  
     Checking features by using the application yourself.
2. Unit Testing  
     Testing small parts of code like functions or methods.
3. Integration Testing  
     Testing how different parts of the application work together.
4. End-to-End (E2E) Testing  
     Testing the full user flow from start to finish.

Each type plays an important role in quality assurance.

Here, the developer checks the output by running the program.

This is the simplest form of testing but not reliable for large projects.

Unit testing checks a single function in isolation.

This helps catch bugs at the smallest level of code.

These examples show how different testing types focus on different parts of an application.

By understanding manual, unit, integration, and end-to-end testing, students gain the foundation needed to ensure high-quality, professional JavaScript applications.