A brief introduction to PHPUnit, Kata, and FizzBuzz.

1. Intro to TDD Using
PHPUnit: A FizzBuzz
Kata
2015 January 7
Kansas City PHP User Group

2. TDD is Stupid
• Writing tests takes time
• I’d rather be coding
• No way I can test everything

3. TDD is Stupid Smart
• Reduces time spent in debugger
• Reduces var_dump and bogus echo statements
• Reduces fear of change

4. Easiest TDD Deals With
Promises
• All tests start with a descriptive name, the promise:
• ex. testEvenNumbersAreDivisibleBy2
• All tests end with $this->assertSomething
• The assert is the final statement of the proof.
• ex.
When Even Numbers Are Divisible By 2,
Assert that (EvenNumber % 2) == 0
Assert that (OddNumber % 2) == 1.

5. TDD Kata
• Kata are are short series of movements repeated enough to be
done without thought — migrating intention into muscle-memory.
• Learn TDD concepts via kata
• True TDD kata are done, discarded, and repeated.
• Non-TDD-Kata Examples:
• Karate Kid III - Kata Scene
• Rika Usami of Japan. 宇佐美 里香。空手 - Final Female Kata

6. Essentials
• To start a TDD Kata using PHPUnit, you need:
• composer.json
• a KataClassTest.php
• a KataClass.php
• You do NOT need to implement the KataClass!

7. Fizz Buzz Kata
• Rules:
• Given a series of numbers, replace certain numbers with
a string.
• Numbers divisible by 3 are replaced by “Fizz”
• Numbers divisible by 5 are replaced by “Buzz”
• Numbers divisible by (3 and 5) are replaced by
“FizzBuzz”
• All other numbers are unchanged

8. Enough Talk. Begin!
• Add the following to composer.json:
• "require-dev": {
"phpunit/phpunit": “~4.4"
}
• Set up environment via Composer:
• $ composer install

9. Test Class
• Create FizzBuzzTest.php
• <?php
include 'vendor/autoload.php';
class FizzBuzzTest extends
PHPUnit_Framework_TestCase
{
}

10. Test, then Fix
• run $ vendor/phpunit/phpunit/phpunit —colors
FizzBuzzTest.php
• Errors!
• Fix ‘em.
• Test again.

11. Demonstration

12. Now, go and study
• PHPUnit:
• Documentation: https://phpunit.de/documentation.html
• Presentations: https://phpunit.de/presentations.html
• Grumpy Programmer Books:
• The Grumpy Programmer's PHPUnit Cookbook: https://leanpub.com/grumpy-phpunit
• The Grumpy Programmer's Guide To Building Testable PHP Applications:
https://leanpub.com/grumpy-testing
• Kata:
• 12 TDDs of Christmas: http://www.wiredtothemoon.com/2012/12/12-tdds-of-christmas/
• http://cyber-dojo.org/
• http://www.codewars.com/

13. Thank you
Eric Poe
eric@ericpoe.com
@eric_poe
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