Practical Unit Testing and Test-Driven Development (TDD)

Writing reliable software requires more than just writing code that works—it requires building a safety net of automated tests. This text-based course guides you through the core principles of unit testing and Test-Driven Development (TDD) to help you catch bugs before they reach production. You will transition from writing untested code to designing software with a test-first mindset, learning how to structure test suites, isolate dependencies, and confidently refactor your codebase through clear explanations and structured code walkthroughs. What you'll learn: Understand the fundamental concepts of unit testing, test suites, and assertions; Master the red-green-refactor workflow to design cleaner, more maintainable code; Apply test doubles, mocks, and stubs to isolate unit tests from external dependencies; Write clean, readable test cases using modern testing framework conventions and best practices; Implement basic regression testing and integrate testing workflows into modern development pipelines. The course starts with essential testing terminology and basic assertions before moving into the core mechanics of the TDD cycle, mocking strategies, and practical refactoring techniques. This course is designed for beginner programmers and software engineers looking to adopt industry-standard testing practices, with no prior testing experience required. Start reading today to elevate your coding standards and build software that stands the test of time.