Unit Testing in WordPress
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Unit testing in WordPress provides time-saving and infallible testing by checking code assumptions in an automated way. PHPUnit is a commonly used CLI tool for running and reporting WordPress unit tests. Effective unit tests should be isolated, readable, quick, and follow an Arrange, Act, Assert pattern where preconditions are set up, the code is invoked, and results are asserted to expected behavior.
Unit Testing in WordPress
- 1. Unit Testing in WordPress WordSesh 3
- 2. Manual Testing Time consuming Error-prone Single point of knowledge
- 5. “A unit test is an automated piece of code that invokes a unit of work in the system and then checks a single assumption about the behavior of that unit of work.”
- 6. Write code before tests
- 7. Write tests before code
- 9. PHPUnit CLI tool that runs unit tests & reports their results. Created by Sebastian Bergmann Easy to install
- 10. Unit Tests Requirements Each test should be able to run on its own (isolated) Easy to read Quick to execute Self explaining function names
- 11. Unit Tests Requirements Test classes should inherit from WP_UnitTestCase (which inherits from PHPUnit_Framework_TestCase) Test functions should start w/ test (test_my_test_name)
- 12. –William C. Wake “This test case fits a pattern I call ‘Arrange, Act, Assert’: it sets up data, calls a method under test, and then verifies that it worked as expected.”
- 13. Arrange Act Assert Easy to - Read - Follow - Understand - Maintain
- 14. Arrange Arrange all necessary preconditions and inputs.
- 15. Act Act on the object or method under test.
- 16. Assert Assert that the expected results have occurred.
- 18. function test_get_single_role_by_user_query() { // Arrange $this->factory->user->create_many( 2, array( 'role' => 'subscriber' ) ); // Act $u_query = new WP_User_Query( array( 'role' => 'subscriber' ) ); // Assert $this->assertEquals( 2, count( $u_query->get_results() ) ); }
- 19. function test_get_single_role_by_user_query() { // Arrange $this->factory->user->create_many( 2, array( 'role' => 'subscriber' ) ); // Act $u_query = new WP_User_Query( array( 'role' => 'subscriber' ) ); // Assert $this->assertEquals( 2, count( $u_query->get_results() ) ); }
- 20. function test_get_single_role_by_user_query() { // Arrange $this->factory->user->create_many( 2, array( 'role' => 'subscriber' ) ); // Act $u_query = new WP_User_Query( array( 'role' => 'subscriber' ) ); // Assert $this->assertEquals( 2, count( $u_query->get_results() ) ); }
- 21. function test_get_single_role_by_user_query() { // Arrange $this->factory->user->create_many( 2, array( 'role' => 'subscriber' ) ); // Act $u_query = new WP_User_Query( array( 'role' => 'subscriber' ) ); // Assert $this->assertEquals( 2, count( $u_query->get_results() ) ); }
- 24. Tools