Java: Testing with JUnit

Learn how to use JUnit, a powerful open-source testing tool for testing Java.

Introduction

• Create proper unit tests in Java
• What should you know
• Unit testing and other types of testing
• TDD: Test-driven development
• Advantages of unit testing
• What is JUnit?

1. Getting Started with JUnit

• Quick example of a basic unit test
• Setting up JUnit for IntelliJ
• Setting up JUnit for VS Code
• Setting up JUnit for Eclipse
• Your first test: HelloJUnit
• A tour of Coderpad
• Solution: Create a test method

2. Writing Basic Tests with JUnit

• Annotations
• Write and run test classes and methods
• DisplayName
• Assertions
• Assumptions
• Test execution order
• Nested tests
• Solution: Custom names

3. More Advanced Usage of JUnit

• Dependency injection in your tests
• Repeated tests
• Parameterized tests
• Timeouts
• Parallel execution
• Lifecyle control: Before and after
• Custom messages and reports
• Conditional test execution
• Disabling unit tests
• Solution: Refactoring

4. Quick Peek at Next Steps

• How to make code ready for unit testing
• Best practices
• Mockito

Conclusion

• Next steps with JUnit