Test Driven Development (TDD) in Java - Unit Testing and Refactoring

Tools, patterns and techniques for writing well-designed and testable code
Overview

This course presents a number of modern practices for developing code based on an iterative and incremental development lifecycle. Agility and predictability are two qualities often missing from software development. A test-driven approach, in which design is grown and code delivered incrementally according to functionality or risk, forms the basis of the construction phase of an iterative and incremental development.

Course Code
TDDJ2UTR
Duration
2 Days
Delivery Style
Classroom
Course Type
Private Only
Max Delegates
12
Available as Nutshell
No

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Purpose of this course

The use of unit testing provides confidence in existing code and supports the ability to refactor code as development unfolds.The course is intended as a practical course: the best way to appreciate how test-driven development works and what it feels like is to do it in practice, making sense of the principles it embodies. In this form the course is based on lecture material, demonstration, discussion and hands-on labs.

Who is this course for

The course is suitable for software developers experienced in Java and familiar with objectoriented principles and practices.

You will learn how to
  • Appreciate the benefits of a continuous and iterative approach to design and delivery
  • Recognise the purpose and practice of refactoring in keeping a system supple and adaptable
  • Know how to build up a set of unit tests in JUnit
  • Understand the consequences of dependency management on testing and code quality
Benefits for your organisation

TDD and Agility offer a wealth of benefits to your organisation, it can cut development costs for example.  Shorten the development Time to Market and increase the programmer’s productivity.  As well as encouraging the writing of quality code.

Benefits for you as an individual

TDD has many benefits but it can be hard to learn alone.  This course will help you write effective, organized and neat code that works.  It will teach you how to shorten the development feedback time and provide proof that your software code works as intended.

Agile Development Microprocess

Traditional versus agile development processes
Iterative and incremental development
Informal and continuous design
The role of refactoring
Refactoring versus other code changes
Extreme Programming
Test-Driven Development

Testing in Principle

Traditional view and reality of testing
Driving development through testing
Testing early, often and automatically
Testing versus debugging
White-box versus black-box testing
Functional versus operational testing

Basic Unit Testing in Practice

Test plans versus test code
Use of Assert
Testing at the interface
Testing the simplest things first
Testing incrementally
Testing correctness of failure

Overview of JUnit

JUnit and the xUnit family
Test cases, test suites and test runners
Essential structure of the framework
Assertion methods
Testing correctness of exceptions
Defining common fixture code
JUnit pattern usage
Extensions to JUnit

Test-Writing Techniques

Red, green, refactor
None to one to many
Faking it
Telling the truth
Isolated and short tests
Refactor common fixture code
Declare, prepare, assert
Test by method, state or scenario
Custom assertions
Compile-time constraints
Running all tests

Common Refactorings

Renaming variables, methods, classes and packages
Restructuring class hierarchies by extracting interfaces, superclasses and subclasses
Partitioning classes by extracting classes and methods
Changing private representation

Decoupling Techniques

Unmanaged dependencies
Test-driven decoupling
Layering
Reorganising packages
Eliminating cyclic dependencies
Mock objects
Eliminating Singletons, statics and other globals
Testing I/O

Prerequisites

Any previous exposure to JUnit or agile development concepts is beneficial but not essential.

About the Lead Trainer

Our Agile ‘evangelist’, it’s safe to say that Howie lives and breathes an Agile life. Never to be seen without a pack of post it notes and a sharpie pen in his back pocket, Howie coaches and trains our customers by sharing his passion for more efficient ways of working.