Test Driven Development (TDD) and Unit Testing Essentials | TDD, JUnit 5, Refactoring, Mocking, Best Practices

Course Agenda

Please note that this list of topics is based on our standard course offering, evolved from typical industry uses and trends. We’ll work with you to tune this course and level of coverage to target the skills you need most.

Session: Introducing Test-driven Development

Lesson: Test-Driven Development

• Rationale for TDD
• The process of TDD
• Advantages to TDD
• Side-effects of TDD
• Tools to support TDD
• Tutorial: Setup IntelliJ for Using Maven

Session: Unit Testing using JUnit

Lesson: Unit Testing Fundamentals

• Purpose of Unit Testing
• Good Unit Tests
• Test Stages
• Unit Testing Vs Integration Testing
• Understanding Unit Testing Frameworks

Lesson: Jumpstart: JUnit 5.x

• Understand and work with the features of JUnit
• Write unit tests using @Test annotation
• Test Result Verification (Assertions)
• Manage fixtures using @BeforeEach, @AfterEach, @BeforeAll and @AfterAll annotations
• Maven setup using Surefire plugin
• Lab: Demo JUnit
• Lab: Build JUnit Case Study
• Lab: Jumpstart JUnit

Lesson: Annotations

• Use @DisplayName to specify a custom name for the test
• Check for exceptions thrown by test
• Use @Disabled to prevent a test class or method from running
• Use timeouts to fail test that take longer than required
• Test Execution Order
• Lab: Working with @Test Annotation

Lesson: Hamcrest

• Learn the notation of assertThat
• Know the objective of Hamcrest library
• Use Hamcrest's logical and object matchers
• Use Hamcrest's number and collection matchers
• Lab: Working with Hamcrest

Lesson: Parameterized Tests

• The @ParameterizedTest annotation
• A parameterized test to test code under several conditions
• Define different sources for test data (@ValueSource, @CsvSource, @CsvFileSource,@EnumSource, @MethodSource, @ArgumentSource)
• Lab: Working with Parameterized Tests

Lesson: Advanced Features

• JUnit 4 vs JUnit 5
• Nested Unit Tests
• Repeated Tests
• JUnit Extensions
• ExecutionConditions
• Lambda Support
• Grouped Assertions
• Lab: Working with  Advanced Features

Lesson: JUnit Best Practices

• "Good" Tests
• Bad Smell
• White-Box Unit Testing
• Black-Box Unit Testing
• Automation and Coverage

Session: Mocking

Lesson: Mocking of Components

• Why We use Test Dummies
• Mock Objects
• Working with Mock Objects
• Using Mocks with the User Interface
• Mock Object Strategies

Lesson: Mock Objects and Mockito

• Mockito Description and Features
• Mockito Object Lifecycle
• JUnit 5 and Mockito Dependency Injection
• Stubs Using ArgumentMatchers
• Verifying Behavior in Mockito
• Partial Mock Objects
• The Spy annotation
• Lab: Mock Object and Mockito

Lesson: PowerMock

• PowerMock Description and Features
• Using PowerMockito
• @PrepareForTest
• Mocking a final class or final method
• Mocking a Static Method

Session: Advanced Topics

Lesson: State-based vs. Interaction-based Testing

• State-based Testing
• Interaction-based Testing
• Mock Objects Support Each Approach
• Three Areas to Check in a Test
• Lab: Interaction-based Testing

Lesson: Improving Code Quality Through Refactoring

• Refactoring Overview
• Refactoring and Testing
• Refactoring to Design Patterns
• Lab: Refactoring
• Lab: Best Practices - Refactoring Tests

Lesson: Database Testing: DbUnit

• Setting up DbUnit
• Defining a Dataset File in XML, CSV or Excel
• Writing a DbUnit Test Class
• Assert the results
• Use the FailureHandler and ValueComparer
• Using Date and Time in test sets
• Export a data set
• Lab: Introduction to DbUnit
• Lab: DbUnit Assertions
• Lab: Selenium and DbUnit