Tech talks #1- Unit testing and TDD

TechTalks #1 Unit Testing and Test-Driven Development Duong Trong Tan [email_address] Hanoi, 9- 2011

Objectives
Why testing?
Introduction to unit testing
Unit testing in Java with JUnit
What is Test-Driven Development?
How can TDD improve quality?
TDD practices and guidelines.
Unit Testing and Test-Driven Development

Unit Testing and Test-Driven Development CRISIS Numbers: 4.4 million cars recalled Billions of $ loss. Damage the brand

Desire vs. Reality Unit Testing and Test-Driven Development gap Requirement Design Desired Implementation Reality testing

Why testing?
Ensuring QUALITY
Managing RISKS
Optimizing Return-On-Investment (ROI)
Professionalism

Typical Production model Unit Testing and Test-Driven Development

Bug cost Unit Testing and Test-Driven Development

Balancing Unit Testing and Test-Driven Development GOOD FAST CHEAP

Testing level
Unit testing
On individual unit of source code (function, class, etc.)
Smallest testable part
Developer testing
Integration testing
On groups of modules
System testing
On complete integrated system

JUnit
Unit testing automation framework for Java
Can do integration test
Integrated in IDEs (Eclipse, NetBeans, IntelliJ, etc.)
Must have tool for Java developers
Unit Testing and Test-Driven Development http://www.junit.org/

Test-Driven Development
You don’t start programming until you have designed your tests!
Strategy
Make it Fail
No code without a failing test
Make it Work
As simply as possible
Make it Better
Refactor(code, design, test, documentation)
Believe in testing

Suggested TDD Unit Testing and Test-Driven Development

Thinking changed
Design or code must be TESTABLE
“ Error Message ” is a good news
Courage
Simple
Agile

How to do TDD
Design
Use [simple] design , figure out what to do
[Then .. create the skeleton first]
Test
Write test that reflect the design
All tests should FAIL
Implement
Write the code
Test
All tests should PASS

TDD live demo
Application: simplified Calculator
Language: Java
Tools used:
NetBeans 7
JUnit
Task board (Excel)
Whiteboard (for simple design)

Red-Green-Blue model Unit Testing and Test-Driven Development

Refactor to Clean Code
Readable
Maintainable
Changeable

Acceptance Test-Driven Development Unit Testing and Test-Driven Development ATDD: team collaboration, a kind of cross-functionality Requirement Automated Acceptance Tests TDD Definition Of Done

Acceptance TDD (ATDD)
3D strategy
D iscuss in requirement workshop
To make tests library
D evelop in concurrence
To create more Passed features
D eliver for acceptance
To meet DONE definition, accepted by users

Supporting system: CI Unit Testing and Test-Driven Development

Q&A Unit Testing and Test-Driven Development

Further reading Unit Testing and Test-Driven Development

Tools
JUnit : http://junit.org
FitNesse : http://fitnesse.org /
RoBotFramework: http ://code.google.com/p/robotframework /
Hudson CI : http://hudson-ci.org /
SVN : http://subversion.tigris.org /

Unit Testing and Test-Driven Development Thank you!
Meet Tấn DT:
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[email_address]

Tech talks #1- Unit testing and TDD

by Duong Tan

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