Test-Driven Development for Java String Validation

Writing reliable validation logic is crucial for any application, but relying only on manual testing leads to brittle code. Learn how to guarantee correctness from the start by adopting a testing-first approach. This course teaches you to apply Test-Driven Development (TDD) principles to build robust string validation utilities in Java. You will master the TDD cycle—Red, Green, Refactor—while implementing complex logic like email address structure checking using regular expressions. What you'll learn: * Understand the fundamental workflow of Test-Driven Development (TDD) and its benefits for code quality. * Practice writing failing tests first to define functional requirements precisely. * Master the creation of effective regular expressions (regex) for complex input validation rules. * Apply modern unit testing techniques using the JUnit 5 framework. * Configure and write parameterized tests for efficient validation of multiple edge cases. * Refactor validation code iteratively to improve readability and performance while maintaining 100% test coverage. The course begins with foundational testing concepts and the TDD workflow, progressing through practical exercises where you implement the validation logic step-by-step. You will examine the evolving requirements for email validation and how to address them systematically through testing. This course is designed for beginner Java developers who want to adopt professional testing practices. No prior experience with TDD or JUnit is required, only basic familiarity with Java syntax. Start building highly reliable and maintainable code today.