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191. Introduction to Java Testing
Version 8.0

Book cover

This course introduces the experienced Java programmer to testing and test-driven development practices using JUnit. We work from the basics of JUnit as a tool, to best practices for writing effective and maintainable tests. The course is not strictly a TDD course, but we introduce TDD and take students through an illustrative case study. We discuss the importance of mocking and explore testing techniques using Mockito. Finally we discuss concerns and strategies for testing enterprise components in the Java EE context.

Prerequisites

  • Solid Java programming experience is essential -- especially object-oriented use of the language. Language features and techniques that are integral to some lab exercises include interfaces and abstract classes, threading, generics and collections, and recursive methods. Course 103, "Java Programming," is excellent preparation.

Learning Objectives

  • Build unit tests for Java classes using JUnit.
  • Write effective tests, and design classes for testability.
  • Understand test-driven development (TDD) and use dynamic mocking to support isolated testing.
  • Develop effective testing strategies for Java-EE components.

Timeline: 2 days.

IDE Support: Eclipse Luna

  • In addition to the primary lab files, an optional overlay is available that adds support for Eclipse Luna. Students can code, build, and test all exercises from within the IDE. See also our orientation to Using Capstone's Eclipse Overlays.

Chapter 1. Automated Unit Testing with JUnit

  • Automated Testing
  • JUnit and Related Tools
  • The @Test Annotation
  • The Assert Class Utility
  • Test Runners
  • Lifecycle Methods
  • Expecting Exceptions
  • Test Suites

Chapter 2. Writing Tests

  • Test Granularity
  • Reusing Test Logic
  • Recording and Comparing Output
  • Test Isolation
  • Controlling the Test Environment
  • Managing Dependencies
  • Non-Invasive Testing
  • Designing for Testability
  • Factories
  • Testing and Threads

Chapter 3. Test-Driven Development

  • Writing the Test First
  • The TDD Cycle
  • Advantages of TDD
  • Resistance to TDD
  • A Case Study

Chapter 4. Mocking

  • Mock Objects in Testing
  • Mock Objects in Test-Driven Development
  • Static vs. Dynamic Mocks
  • Stubbing
  • Verifying
  • Matching and Capturing
  • Using a Spy
  • Partial Mocking

Chapter 5. Testing Enterprise Components

  • Challenges in Java-EE Testing
  • The Java Naming and Directory Interface
  • Mocking JNDI
  • Java-EE Dependency Injection
  • Testing Persistence Components
  • Mocking JDBC and JPA
  • Test Databases
  • Auto-Rollback
  • Verifying Transactionality and Cleanup
  • Web Components
  • Mocking the Web Container
  • Asynchronous Messaging
  • Mocking the JMS Session
  • Web-Services APIs: JAX-WS and JAX-RS

System Requirements

Hardware Requirements (Minimum) Core i5, 1.8 GHz, 4 gig RAM, 500 meg disk space.
Hardware Requirements (Recommended) Core i5, 2.8 GHz, 8 gig RAM, 500 meg disk space.
Operating System Tested on Windows 7/8, Mac OS 10.8.5.
Network and Security Limited privileges required -- please see our standard security requirements.
Software Requirements All free downloadable tools.