Java Junit

Writing good unit tests helps you catch bugs early and keep your code working as expected. This guide covers JUnit 5 best practices, from setting up your project to writing both standard and data-driven tests. You will learn how to structure tests, use assertions, and mock dependencies for clean, reliable test code.

Whether you are new to testing or want to improve your existing test suite, these tips make your tests easier to read and maintain. The approach works for any Java project using Maven or Gradle. Focus on single behaviors, keep tests independent, and use parameterized tests to run the same logic with different inputs.

With clear naming, proper setup and teardown methods, and smart use of annotations like @ParameterizedTest and @DisplayName, your unit tests become a powerful safety net. This skill helps you write tests that give you confidence every time you build your software.