A Comprehensive Guide to Unit Testing, Integration Testing, and End-To-End Testing in Software Development

In the dynamic world of software development, ensuring the reliability and functionality of your code is paramount. This is where testing becomes a crucial player, and three essential types stand out: Unit Testing, Integration Testing, and End-To-End Testing. In this comprehensive guide, we’ll delve into the what, how, and why of each testing concept, shedding light on their unique roles in building robust software.

Unit Testing: Ensuring Building Blocks Stand Strong
What is Unit Testing?
Unit Testing involves testing individual components or units of code in isolation. These units are the smallest testable parts of an application, such as functions or methods.

How is Unit Testing Done?
Developers write test cases to validate the correctness of individual units. The goal is to verify that each unit functions as intended and handles various inputs and scenarios appropriately.

Why Unit Testing Matters?
Unit Testing offers several benefits, including early bug detection, facilitating code changes without fear of breaking existing functionality, and serving as documentation for the expected behavior of units.

Code Example:

public class Calculator {
    public int add(int a, int b) {
        return a + b;
    }
}

// Unit Test
@Test…