Unit testing for WordPress

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Unit testing for WordPress

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Unit testing for WordPress

  1. 1. Sudar Muthu | @sudarmuthu #WCPune Unit Testing For WordPress WordCamp Pune, 2015 Sudar Muthu http://sudarmuthu.com https://github.com/sudar
  2. 2. Sudar Muthu | @sudarmuthu #WCPune Me • Programming in PHP for more than a decade and in WordPress for about 8 years. • Big fan of automating process and workflows. • Contributor to a couple of open source projects. • Remote worker at 10up (and yes 10up is hiring :) )
  3. 3. Sudar Muthu | @sudarmuthu #WCPune What about you? • What is your typical development environment? • What is your experience with PHP and WordPress? • What is your experience with Unit Testing? • What are your expectations out of this talk?
  4. 4. Sudar Muthu | @sudarmuthu #WCPune Unit Testing Credit: https://twitter.com/alistratov/status/599109195548459009
  5. 5. Sudar Muthu | @sudarmuthu #WCPune Is there something wrong? class Sample { protected $value; public function initialise($value) { $this->value = $value; } public function execute() { if (!$this->value) { throw new Exception("value not set"); } return $value * 10; // business logic } } $sample = new Sample; $sample->execute();
  6. 6. Sudar Muthu | @sudarmuthu #WCPune Finding bugs is not easy
  7. 7. Sudar Muthu | @sudarmuthu #WCPune Write Tests
  8. 8. Sudar Muthu | @sudarmuthu #WCPune Write Tests It sounds obvious but getting started is the hardest part!
  9. 9. Sudar Muthu | @sudarmuthu #WCPune Different types of Testing • Functionality testing • Integration testing • Unit testing
  10. 10. Sudar Muthu | @sudarmuthu #WCPune Different types of Testing • Functionality testing • Integration testing • Unit testing
  11. 11. Sudar Muthu | @sudarmuthu #WCPune Briefly • What is PHPUnit? • Installing PHPUnit • Setting up folder structure • phpunit.xml
  12. 12. Sudar Muthu | @sudarmuthu #WCPune Three steps in test cases • setup • act • verify
  13. 13. Sudar Muthu | @sudarmuthu #WCPune Demo
  14. 14. Sudar Muthu | @sudarmuthu #WCPune Writing our first test case public function test_execute_works_with_initialise() { // setup $sample = new Sample(); // act $sample->initialise(10); $return = $sample->execute(); // verify $this->assertEquals(100, $return); }
  15. 15. Sudar Muthu | @sudarmuthu #WCPune Testing Exception /** * @expectedException Exception */ public function test_execute_needs_initialise() { // setup $sample = new Sample(); // act $sample->execute(); // verify // that it throws and exception }
  16. 16. Sudar Muthu | @sudarmuthu #WCPune Let’s add more tests • Testing decimals • Testing with negative values • Testing it work with zero
  17. 17. Sudar Muthu | @sudarmuthu #WCPune Unit Testing WordPress Code
  18. 18. Sudar Muthu | @sudarmuthu #WCPune What should be tested? function my_permalink_function( $post_id ) { $permalink = get_permalink( absint( $post_id ) ); $permalink = apply_filters( 'special_filter', $permalink ); do_action( 'special_action', $permalink ); return $permalink; }
  19. 19. Sudar Muthu | @sudarmuthu #WCPune Don’t test the WordPress built-in function
  20. 20. Sudar Muthu | @sudarmuthu #WCPune Don’t test the WordPress built-in function Use Mocks instead https://github.com/10up/wp_mock
  21. 21. Sudar Muthu | @sudarmuthu #WCPune Mocking WordPress function WP_Mock::wpFunction( 'get_permalink', array( 'args' => 42, 'times' => 1, 'return' => 'http://example.com/foo' ) );
  22. 22. Sudar Muthu | @sudarmuthu #WCPune Mocking WordPress filter WP_Mock::onFilter( 'special_filter' ) ->with( 'http://example.com/foo' ) ->reply( 'https://example.com/bar' );
  23. 23. Sudar Muthu | @sudarmuthu #WCPune Mocking WordPress action WP_Mock::expectAction( 'special_action', 'https://example.com/bar' );
  24. 24. Sudar Muthu | @sudarmuthu #WCPune Putting it all together public function test_my_permalink_function() { WP_Mock::wpFunction( 'get_permalink', array( 'args' => 42, 'times' => 1, 'return' => 'http://example.com/foo' ) ); WP_Mock::wpPassthruFunction( 'absint', array( 'times' => 1 ) ); WP_Mock::onFilter( 'special_filter' ) ->with( 'http://example.com/foo' ) ->reply( 'https://example.com/bar' ); WP_Mock::expectAction( 'special_action', 'https://example.com/bar' ); $result = my_permalink_function( 42 ); $this->assertEquals( 'https://example.com/bar', $result ); }
  25. 25. Sudar Muthu | @sudarmuthu #WCPune Some PHPUnit Tips • Have a fast test suite • Use Composer • Enable code coverage in reports • phpunit.xml.dist vs phpunit.xml • Use specific assertions • Check out Unit tests in WordPress core
  26. 26. Sudar Muthu | @sudarmuthu #WCPune WordPress plugin skeleton with Tests Use yo generator https://github.com/10up/generator-wp-make
  27. 27. Sudar Muthu | @sudarmuthu #WCPune Thank You @sudarmuthu http://sudarmuthu.com https://github.com/sudar

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