Unit Testing and Test-Driven Development

Welcome to Unit Testing & Test-Driven Development, a practical, industry-focused course that teaches you how to build high-quality, reliable, and maintainable software using modern unit testing, Test-Driven Development (TDD), and Behavior-Driven Development (BDD) practices. In this course, you’ll master the fundamentals of unit testing, including test structure, naming conventions, and maintainable test design. You’ll learn how to isolate code using mocks and test doubles, apply dependency injection for testability, and confidently test asynchronous and event-driven logic. The course then dives deep into TDD workflows, helping you design features using the Red–Green–Refactor cycle and apply TDD in real-world projects such as APIs, services, and error-handling scenarios. Finally, you’ll explore BDD with Gherkin, writing readable scenarios and automating full feature implementations using testing frameworks. By the end of this course, you will be able to: -Understand why unit testing is essential for software reliability and long-term code quality -Write clean, maintainable, and scalable unit tests -Use mocking, test doubles, and dependency injection to isolate code under test -Test asynchronous, edge-case, and time-sensitive logic -Apply Test-Driven Development (TDD) to design and refactor production-ready features -Implement TDD for APIs, services, and error-handling workflows -Write and automate BDD scenarios using Gherkin for clear, behavior-focused testing Through guided demos and hands-on exercises, you’ll build test suites, refactor poorly testable code, develop features using TDD, and automate BDD scenarios end-to-end. These practical activities help bridge the gap between testing theory and real-world software development. This course is ideal for software developers, QA engineers, SDETs, and engineering students who want to improve code reliability, test automation skills, and development confidence. Basic programming knowledge is recommended, but no prior experience with unit testing, TDD, or BDD is required

• Write clean, maintainable unit tests following industry standards
• Isolate and test code effectively using mocks and dependency injection, including asynchronous cases
• Design and implement production-ready features with TDD's Red–Green–Refactor cycle
• Define and automate behavior-driven tests using BDD and Gherkin

• Basic computer and internet skills
• Ability to read English instructions and complete practice exercises