Introduction to JUnit

• Overview of JUnit and its role in unit testing
• Understanding the importance of automated testing in software development
• Introduction to JUnit’s features and testing conventions

Setting Up JUnit

• Configuring JUnit in different testing environments (Eclipse, IntelliJ IDEA, etc.)
• Integrating JUnit with build tools (Maven, Gradle, etc.)
• Setting up dependencies and JUnit annotations

Writing Basic Test Cases

• Writing simple JUnit test cases using the @Test annotation
• Understanding test case structure, assertions, and test execution flow
• Handling test setup and teardown using @Before, @After, @BeforeClass, and @AfterClass annotations

Testing Fundamentals

• Writing effective test cases with proper test design and coverage
• Understanding test coverage metrics (e.g., statement coverage, branch coverage, etc.)
• Using JUnit assertions for validating expected outcomes

Test Fixtures and Test Data

• Creating and managing test fixtures using @Before and @After methods
• Initializing and cleaning up test data for each test case
• Handling shared and isolated test data scenarios

Parameterized Tests

• Writing parameterized tests using JUnit’s @ParameterizedTest annotation
• Configuring test data sources and data providers
• Testing with multiple input values and expected outcomes

Test Suites and Categories

• Creating test suites to group and execute multiple test classes
• Organizing and categorizing test cases using JUnit categories
• Running specific test suites or categories

Exception Testing

• Testing exceptions and error conditions using JUnit’s @Test(expected) and assertThrows() methods
• Verifying exception messages and types
• Handling expected exceptions in different scenarios

Testing with Mock Objects

• Introduction to mocking frameworks (such as Mockito) for creating mock objects
• Using mock objects to isolate dependencies and test specific behaviors
• Combining JUnit and mock objects for effective unit testing

Test Coverage and Code Analysis

• Analyzing code coverage using JUnit and code coverage tools (e.g., JaCoCo, Cobertura, etc.)
• Identifying untested code segments and improving coverage
• Integrating code analysis tools into the testing process

Testing Spring Applications with JUnit

• Testing Spring components, such as controllers, services, and repositories, using JUnit
• Configuring test contexts and dependencies using Spring’s testing annotations
• Mocking dependencies and interacting with the Spring application context in tests

Test-Driven Development (TDD)

• Introduction to Test-Driven Development (TDD) principles and practices
• Applying TDD approach in writing tests before writing production code
• Incorporating JUnit into the TDD workflow

Advanced Testing Techniques

• Testing asynchronous code and callbacks
• Working with test doubles (stubs, spies, and mocks) for complex scenarios
• Handling time-related tests and simulations

Best Practices and Code Quality

• Applying best practices for writing effective and maintainable tests
• Writing readable and expressive test cases
• Avoiding common testing pitfalls and anti-patterns