Slides from my unit-testing talk at the PHP World Kongress

1. Unit-Tests
Schnell und einfach selbst gemacht
TobiasSchlitt <toby@php.net>
PHP World Kongress 2009
2009-11-24
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2. About me
Tobias Schlitt <toby@php.net>
PHP since 2001
Freelancing consultant
Qualified IT Specialist
Studying CS at TU Dortmund
(finishing mid 2010)
OSS addicted
eZ Components
PHPUnit
Various other projects . . .
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3. Overview
1 Testing
2 PHPUnit
3 Advanced scenarios (optional)
4 The end
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4. Outline
1 Testing
Methods of testing
Unit tests
2 PHPUnit
3 Advanced scenarios (optional)
4 The end
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5. A little survey . . .
Do you test?
When?
How?
Who?
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6. A little survey . . .
Do you test?
When?
How?
Who?
Tobias Schlitt (PHP World Kongress 2009) Unit-Tests 2009-11-24 5 / 25

7. A little survey . . .
Do you test?
When?
How?
Who?
Tobias Schlitt (PHP World Kongress 2009) Unit-Tests 2009-11-24 5 / 25

8. A little survey . . .
Do you test?
When?
How?
Who?
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9. Ways of testing
Automatic vs. manual
Developer vs. tester
Internal vs. external
Back end vs. front end
Code vs. appearance
Functional vs. non-functional
Dynamic vs. static
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10. Ways of testing
Automatic vs. manual
Developer vs. tester
Internal vs. external
Back end vs. front end
Code vs. appearance
Functional vs. non-functional
Dynamic vs. static
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11. Ways of testing
Automatic vs. manual
Developer vs. tester
Internal vs. external
Back end vs. front end
Code vs. appearance
Functional vs. non-functional
Dynamic vs. static
Tobias Schlitt (PHP World Kongress 2009) Unit-Tests 2009-11-24 6 / 25

12. Ways of testing
Automatic vs. manual
Developer vs. tester
Internal vs. external
Back end vs. front end
Code vs. appearance
Functional vs. non-functional
Dynamic vs. static
Tobias Schlitt (PHP World Kongress 2009) Unit-Tests 2009-11-24 6 / 25

13. Ways of testing
Automatic vs. manual
Developer vs. tester
Internal vs. external
Back end vs. front end
Code vs. appearance
Functional vs. non-functional
Dynamic vs. static
Tobias Schlitt (PHP World Kongress 2009) Unit-Tests 2009-11-24 6 / 25

14. Ways of testing
Automatic vs. manual
Developer vs. tester
Internal vs. external
Back end vs. front end
Code vs. appearance
Functional vs. non-functional
Dynamic vs. static
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15. Ways of testing
Automatic vs. manual
Developer vs. tester
Internal vs. external
Back end vs. front end
Code vs. appearance
Functional vs. non-functional
Dynamic vs. static
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16. Ways of testing
Automatic vs. manual
Developer vs. tester
Internal vs. external
Back end vs. front end
Code vs. appearance
Functional vs. non-functional
Dynamic vs. static
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17. Test methods
Unit tests
Integration tests
Regression tests
Acceptance tests
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18. Unit tests
Validate functionality
Test a single unit of code
Avoid regressions
Verify interfaces
Test bugs dedicatedly
Force code modularization
Migrate safely
Test driven development (TDD)
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19. Unit tests
Validate functionality
Test a single unit of code
Avoid regressions
Verify interfaces
Test bugs dedicatedly
Force code modularization
Migrate safely
Test driven development (TDD)
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20. Unit tests
Validate functionality
Test a single unit of code
Avoid regressions
Verify interfaces
Test bugs dedicatedly
Force code modularization
Migrate safely
Test driven development (TDD)
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21. Unit tests
Validate functionality
Test a single unit of code
Avoid regressions
Verify interfaces
Test bugs dedicatedly
Force code modularization
Migrate safely
Test driven development (TDD)
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22. Unit tests
Validate functionality
Test a single unit of code
Avoid regressions
Verify interfaces
Test bugs dedicatedly
Force code modularization
Migrate safely
Test driven development (TDD)
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23. Unit tests
Validate functionality
Test a single unit of code
Avoid regressions
Verify interfaces
Test bugs dedicatedly
Force code modularization
Migrate safely
Test driven development (TDD)
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24. Unit tests
Validate functionality
Test a single unit of code
Avoid regressions
Verify interfaces
Test bugs dedicatedly
Force code modularization
Migrate safely
Test driven development (TDD)
Tobias Schlitt (PHP World Kongress 2009) Unit-Tests 2009-11-24 8 / 25

25. Unit tests
Validate functionality
Test a single unit of code
Avoid regressions
Verify interfaces
Test bugs dedicatedly
Force code modularization
Migrate safely
Test driven development (TDD)
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26. Outline
1 Testing
2 PHPUnit
Installation
PHPUnit basics
Code examples
3 Advanced scenarios (optional)
4 The end
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27. PHPUnit
Port of JUnit to PHP
Many enhancements
Database tests
Code coverage
Data providers
Invented by Sebastian Bergmann
Standard for unit testing in PHP
http://www.phpunit.de/
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28. Installation
Via PEAR
$ pear channel-discover pear.phpunit.de
$ pear install phpunit/PHPUnit
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29. PHPUnit basics
YourClass
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30. PHPUnit basics
YourClass YourClassTest
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31. PHPUnit basics
YourClass YourClassTest
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32. PHPUnit basics
TestCase
YourClass YourClassTest
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33. PHPUnit basics
TestRunner
TestCase
YourClass YourClassTest
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34. PHPUnit basics
TestRunner
TestCase
YourClass YourClassTest
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35. Let’s dig into some code
Let’s dig into some code
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36. Outline
1 Testing
2 PHPUnit
3 Advanced scenarios (optional)
Custom test environment
Testing a WebDAV server
Testing graphic generation
Testing parsers
4 The end
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37. eZ Component test runner
Custom test runner
Integrated auto loading
Component base testing
Run all tests
Extended test case / suite classes
Custom assertions
Database testing
Utility functions
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38. eZ Webdav component
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39. Semi-automatic regression tests
Manual client test run
Defined test receipe
Capture request / response data
Replay request in unit tests
Detect response regressions
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40. Binary regressions
Binary differences in generated images
Test failures depending on
PHP version
GD version
Operating system
Images visually equivalent
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41. Custom assertions
Custom assertion
Custom equality constraint
Based on ImageMagick
Allows defined gap
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42. Untestable code
Parsers are highly dependant
De-coupling hardly possible
Huge amount of mock objects
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43. Integration tests
Test parser as a whole
Small test files
Manually create / validate
Large overall tests
Manual inspection of generated data
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44. Outline
1 Testing
2 PHPUnit
3 Advanced scenarios (optional)
4 The end
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45. Questions / Answers
Questions? Feedback? Critics?
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46. The end
I hope you enjoyed the session
Slides and material
http://schlitt.info/opensource
http://www.slideshare.net/tobyS
Contact: Tobias Schlitt <toby@php.net>
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47. PHPUnderControl
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