Unit Testing

Unit testing is a software testing methodology where individual units or components of a software application are tested in isolation to verify that they function as intended. A unit is typically the smallest testable part of an application, such as a function, method, or class. This approach helps identify bugs early in the development cycle and ensures code reliability and maintainability.

Also known as: Unit Tests, Unit Test, Unit Testing Framework, Unit Test Cases, UT

Why learn Unit Testing?

Developers should learn and use unit testing to catch defects early, reduce debugging time, and facilitate code refactoring without breaking existing functionality. It is essential in agile and test-driven development (TDD) environments, where tests are written before the code to guide design and ensure quality. Common use cases include validating business logic, handling edge cases, and integrating with continuous integration/continuous deployment (CI/CD) pipelines for automated testing.

Learning Resources

• docs: JUnit 5 User Guide
• docs: Python unittest — Unit testing framework
• tutorial: Unit Testing Tutorial for Beginners
• tutorial: Introduction to Unit Testing in JavaScript
• book: Unit Testing Principles, Practices, and Patterns