Testing untestable codeStephan Hochdörfer, bitExpert AG
Testing untestable code About me  Stephan Hochdörfer, bitExpert AG  Department Manager Research Labs  enjoying PHP sinc...
Testing untestable code No excuse for writing bad code!
Testing untestable code     "There is no secret to writing tests,       there are only secrets to write               test...
Testing untestable code What is „untestable code“?
Testing untestable code    "...our test strategy requires us to    have more control [...] of the sut."    Gerard Meszaros...
Testing untestable code In a perfect world...                  Unittest                   Unittest   SUT                  ...
Testing untestable code Legacy code is not perfect...                                 Dependency                          ...
Testing untestable code                                 ... Legacy code is not perfect...                                 ...
Testing untestable code                                 ... Legacy code is not perfect...                                 ...
Testing untestable code How to get „testable“ code?
Testing untestable code How to get „testable“ code?                   Refactoring
Testing untestable code   "Before you start refactoring, check      that you have a solid suite of                  tests....
Testing untestable code Which path to take?
Testing untestable code Which path to take?       Do not change existing code!
Testing untestable code Examples Object Construction      External resources   Language issues
Testing untestable code Object construction <?php class Car {    private $Engine;     public function __construct($sEngine...
Testing untestable code Object construction - Autoload <?php function run_autoload($psClass) {    $sFileToInclude = strtol...
Testing untestable code Object construction <?php include(Engine.php); class Car {    private $Engine;     public function...
Testing untestable code Object construction - include_path <?php ini_set(include_path,    /custom/mocks/.PATH_SEPARATOR.  ...
Testing untestable code Object construction – Stream Wrapper <?php class CustomWrapper {   private $_handler;   function s...
Testing untestable code Object construction – Stream Wrapper stream_wrapper_unregister(file); stream_wrapper_register(file...
Testing untestable code Object construction – Stream Wrapper <?php class CustomWrapper {    private $_handler;    function...
Testing untestable code External resources
Testing untestable code External resources             Database     Webservice            Filesystem    Mailserver
Testing untestable code External resources – Mock database
Testing untestable code External resources – Mock database          Provide own implementation
Testing untestable code External resources – Mock database                          ZF example:          $db = new Custom_...
Testing untestable code External resources – Mock databasePHPUnit_Extensions_Database_TestCase
Testing untestable code External resources – Mock database            Proxy for your SQL Server
Testing untestable code External resources – Mock webservice
Testing untestable code External resources – Mock webservice          Provide own implementation
Testing untestable code External resources – Mock webservice           Host redirect via /etc/hosts
Testing untestable code External resources – Mock filesystem
Testing untestable code External resources – Mock filesystem <?php // set up test environmemt vfsStream::setup(exampleDir)...
Testing untestable code External resources – Mock Mailserver
Testing untestable code External resources – Mock Mailserver                 Use fake mail server
Testing untestable code External resources – Mock Mailserver $ cat /etc/php5/php.ini | grep sendmail_path sendmail_path=/u...
Testing untestable code Dealing with language issues
Testing untestable code Dealing with language issues             Testing your privates?
Testing untestable code Dealing with language issues <?php class CustomWrapper {    private $_handler;    function stream_...
Testing untestable code Dealing with language issues $myClass = new MyClass(); $reflectionClass  = new ReflectionClass(MyC...
Testing untestable code Dealing with language issues       Overwrite internal functions?
Testing untestable code Dealing with language issues              pecl install runkit-0.9
Testing untestable code Dealing with language issues - Runkit <?php ini_set(runkit.internal_override, 1); runkit_function_...
Testing untestable code Dealing with language issues       pecl install funcall-0.3.0alpha
Testing untestable code Dealing with language issues - Funcall <?php function my_func($arg1, $arg2) {     return $arg1.$ar...
Testing untestable code Dealing with language issues               funcall for methods?
Testing untestable code Dealing with language issues git clone https://github/juliens/AOP
Testing untestable code Dealing with language issues - AOP <?php aop_add_after(Car::drive*,  adviceForDrive);
Testing untestable code Dealing with language issues - AOP <?php $advice = function(AopTriggeredJoinpoint $jp) {   $return...
Testing untestable code What else?           Generative Programming
Testing untestable code Generative Programming                          Configuration                           Configurat...
Testing untestable code Generative Programming                          Configuration                           Configurat...
Testing untestable code Generative Programming                          Configuration                           Configurat...
Testing untestable code Generative Programming       A frame is a data structure       for representing knowledge.
Testing untestable code Frame <?php class Car {    private $Engine;     public function __construct($sEngine) {        $th...
Testing untestable code ContentProvider for the Frame public class MyContentProvider extends     AbstractContentProvider {...
Testing untestable code Generated result – Test Enviroment <?php class Car {    private $Engine;     public function __con...
Testing untestable code Generated result – Prod. Enviroment <?php class Car {    private $Engine;     public function __co...
Testing untestable code Curious for more?                     http://replicatorframework.org
Thank you!
Please rate: http://bit.ly/ML0alS
Testing untestable code - oscon 2012
Testing untestable code - oscon 2012
Testing untestable code - oscon 2012
Testing untestable code - oscon 2012
Testing untestable code - oscon 2012
Testing untestable code - oscon 2012
Testing untestable code - oscon 2012
Testing untestable code - oscon 2012
Testing untestable code - oscon 2012
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Testing untestable code - oscon 2012

  1. 1. Testing untestable codeStephan Hochdörfer, bitExpert AG
  2. 2. Testing untestable code About me  Stephan Hochdörfer, bitExpert AG  Department Manager Research Labs  enjoying PHP since 1999  S.Hochdoerfer@bitExpert.de  @shochdoerfer
  3. 3. Testing untestable code No excuse for writing bad code!
  4. 4. Testing untestable code "There is no secret to writing tests, there are only secrets to write testable code!" Miško Hevery
  5. 5. Testing untestable code What is „untestable code“?
  6. 6. Testing untestable code "...our test strategy requires us to have more control [...] of the sut." Gerard Meszaros, xUnit Test Patterns: Refactoring Test Code
  7. 7. Testing untestable code In a perfect world... Unittest Unittest SUT SUT
  8. 8. Testing untestable code Legacy code is not perfect... Dependency Dependency Unittest Unittest SUT SUT Dependency Dependency
  9. 9. Testing untestable code ... Legacy code is not perfect... Dependency Dependency Unittest Unittest SUT SUT Dependency Dependency ...
  10. 10. Testing untestable code ... Legacy code is not perfect... Dependency Dependency Unittest Unittest SUT SUT Dependency Dependency ...
  11. 11. Testing untestable code How to get „testable“ code?
  12. 12. Testing untestable code How to get „testable“ code? Refactoring
  13. 13. Testing untestable code "Before you start refactoring, check that you have a solid suite of tests." Martin Fowler, Refactoring
  14. 14. Testing untestable code Which path to take?
  15. 15. Testing untestable code Which path to take? Do not change existing code!
  16. 16. Testing untestable code Examples Object Construction External resources Language issues
  17. 17. Testing untestable code Object construction <?php class Car { private $Engine; public function __construct($sEngine) { $this­>Engine = Engine::getByType($sEngine); } }
  18. 18. Testing untestable code Object construction - Autoload <?php function run_autoload($psClass) { $sFileToInclude = strtolower($psClass)..php; if(strtolower($psClass) == engine) { $sFileToInclude = /custom/mocks/.       $sFileToInclude; } include($sFileToInclude); } // Testcase spl_autoload_register(run_autoload); $oCar = new Car(Diesel); echo $oCar­>run();
  19. 19. Testing untestable code Object construction <?php include(Engine.php); class Car { private $Engine; public function __construct($sEngine) { $this­>Engine = Engine::getByType($sEngine); } }
  20. 20. Testing untestable code Object construction - include_path <?php ini_set(include_path, /custom/mocks/.PATH_SEPARATOR. ini_get(include_path)); // Testcase include(car.php); $oCar = new Car(Diesel); echo $oCar­>run();
  21. 21. Testing untestable code Object construction – Stream Wrapper <?php class CustomWrapper {   private $_handler;   function stream_open($path, $mode, $options,  &$opened_path) {     stream_wrapper_restore(file);  // @TODO: modify $path before fopen     $this­>_handler = fopen($path, $mode);     stream_wrapper_unregister(file);     stream_wrapper_register(file, CustomWrapper);     return true;   } }
  22. 22. Testing untestable code Object construction – Stream Wrapper stream_wrapper_unregister(file); stream_wrapper_register(file, CustomWrapper);
  23. 23. Testing untestable code Object construction – Stream Wrapper <?php class CustomWrapper { private $_handler; function stream_read($count) { $content = fread($this­>_handler, $count); $content = str_replace(Engine::getByType,        AbstractEngine::get, $content); return $content; } }
  24. 24. Testing untestable code External resources
  25. 25. Testing untestable code External resources Database Webservice Filesystem Mailserver
  26. 26. Testing untestable code External resources – Mock database
  27. 27. Testing untestable code External resources – Mock database Provide own implementation
  28. 28. Testing untestable code External resources – Mock database ZF example: $db = new Custom_Db_Adapter(array()); Zend_Db_Table::setDefaultAdapter($db);
  29. 29. Testing untestable code External resources – Mock databasePHPUnit_Extensions_Database_TestCase
  30. 30. Testing untestable code External resources – Mock database Proxy for your SQL Server
  31. 31. Testing untestable code External resources – Mock webservice
  32. 32. Testing untestable code External resources – Mock webservice Provide own implementation
  33. 33. Testing untestable code External resources – Mock webservice Host redirect via /etc/hosts
  34. 34. Testing untestable code External resources – Mock filesystem
  35. 35. Testing untestable code External resources – Mock filesystem <?php // set up test environmemt vfsStream::setup(exampleDir); // create directory in test enviroment mkdir(vfsStream::url(exampleDir)./sample/); // check if directory was created echo vfsStreamWrapper::getRoot()­>hasChild(sample);
  36. 36. Testing untestable code External resources – Mock Mailserver
  37. 37. Testing untestable code External resources – Mock Mailserver Use fake mail server
  38. 38. Testing untestable code External resources – Mock Mailserver $ cat /etc/php5/php.ini | grep sendmail_path sendmail_path=/usr/local/bin/logmail $ cat /usr/local/bin/logmail cat >> /tmp/logmail.log
  39. 39. Testing untestable code Dealing with language issues
  40. 40. Testing untestable code Dealing with language issues Testing your privates?
  41. 41. Testing untestable code Dealing with language issues <?php class CustomWrapper { private $_handler; function stream_read($count) { $content = fread($this­>_handler, $count); $content = str_replace(          private function,          public function,           $content       ); return $content; } }
  42. 42. Testing untestable code Dealing with language issues $myClass = new MyClass(); $reflectionClass  = new ReflectionClass(MyClass); $reflectionMethod = $reflectionClass­> getMethod(mydemo); $reflectionMethod­>setAccessible(true); $reflectionMethod­>invoke($myClass);
  43. 43. Testing untestable code Dealing with language issues Overwrite internal functions?
  44. 44. Testing untestable code Dealing with language issues pecl install runkit-0.9
  45. 45. Testing untestable code Dealing with language issues - Runkit <?php ini_set(runkit.internal_override, 1); runkit_function_redefine(mail,,return  true;); ?>
  46. 46. Testing untestable code Dealing with language issues pecl install funcall-0.3.0alpha
  47. 47. Testing untestable code Dealing with language issues - Funcall <?php function my_func($arg1, $arg2) {     return $arg1.$arg2; } function post_cb($args,$result, $process_time) {   // return custom result based on  $args } fc_add_post(my_func,post_cb); var_dump(my_func(php, c));
  48. 48. Testing untestable code Dealing with language issues funcall for methods?
  49. 49. Testing untestable code Dealing with language issues git clone https://github/juliens/AOP
  50. 50. Testing untestable code Dealing with language issues - AOP <?php aop_add_after(Car::drive*,  adviceForDrive);
  51. 51. Testing untestable code Dealing with language issues - AOP <?php $advice = function(AopTriggeredJoinpoint $jp) {   $returnValue =       $jp­>getReturnedValue();   // modify the return value   $returnValue = 1234;   $jp­>setReturnedValue($returnValue); }; aop_add_after(Car­>drive(), $advice);
  52. 52. Testing untestable code What else? Generative Programming
  53. 53. Testing untestable code Generative Programming Configuration Configuration (DSL) (DSL) 1..n Implementation- Implementation- components Generator Generator Product components Product
  54. 54. Testing untestable code Generative Programming Configuration Configuration (DSL) (DSL) Customer 22 Customer Implementation- Implementation- components Generator Generator Customer 11 components Customer
  55. 55. Testing untestable code Generative Programming Configuration Configuration (DSL) (DSL) Test Test Enviroment Enviroment Implementation- Implementation- components Generator Generator Prod. Prod. components Enviroment Enviroment
  56. 56. Testing untestable code Generative Programming A frame is a data structure for representing knowledge.
  57. 57. Testing untestable code Frame <?php class Car { private $Engine; public function __construct($sEngine) { $this­>Engine = <!{Factory}!>:: getByType($sEngine); } }
  58. 58. Testing untestable code ContentProvider for the Frame public class MyContentProvider extends     AbstractContentProvider {     public SlotConfiguration computeSlots(         FeatureConfiguration config) {         SlotConfiguration sl = new SlotConfiguration();         if(config.hasFeature("unittest")) {             sl.put("Factory", "FactoryMock");         } else {             sl.put("Factory", "EngineFactory");         }         return sl;     } }
  59. 59. Testing untestable code Generated result – Test Enviroment <?php class Car { private $Engine; public function __construct($sEngine) { $this­>Engine = FactoryMock:: getByType($sEngine); } }
  60. 60. Testing untestable code Generated result – Prod. Enviroment <?php class Car { private $Engine; public function __construct($sEngine) { $this­>Engine = EngineFactory:: getByType($sEngine); } }
  61. 61. Testing untestable code Curious for more? http://replicatorframework.org
  62. 62. Thank you!
  63. 63. Please rate: http://bit.ly/ML0alS
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