Software Testing for Developers: Jest, TDD, and API Testing

Writing functional code is only half the battle; ensuring it remains reliable as your application grows is what separates professional developers from the rest. This text-based course guides you through the core principles of software testing, helping you build confidence in your codebase. You will transition from writing untested scripts to designing robust, testable JavaScript applications. You will learn how to structure tests, mock dependencies, and apply industry-standard testing paradigms to catch bugs before they reach production. What you'll learn: Understand fundamental testing terminology, test suites, assertions, and the testing lifecycle; Write automated unit tests for JavaScript applications using the Jest framework; Apply modern testing paradigms including Test-Driven Development (TDD) and Behavior-Driven Development (BDD); Test APIs and web services effectively using Postman and mock functions; Implement behavior-driven scenarios using Cucumber to align development with business requirements; Explore performance and load testing basics using JMeter to ensure application stability; Integrate test suites into modern continuous integration (CI) workflows for automated validation. The course starts with foundational definitions and the philosophy of software testing before moving into practical code examples. You will progress step-by-step from simple unit tests to integration, API, and behavior-driven testing scenarios. This course is designed for JavaScript developers who are absolute beginners to software testing. No prior testing experience is required, though a basic understanding of JavaScript syntax is recommended. Start reading today to build more reliable, professional-grade software.