Test Drive Development with WordPress

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The secret to coding with conﬁdence Test Driven Development with WordPress 1

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What is TDD? • Getting into the habit of writing tests before writing code. • TDD are continuous short cycle of test, code, refactor. • Test cases are in separate ﬁles. No more print_r & var_dump in your code! • The tests contain assertions that are either true or false. Passing the tests conﬁrms correct behavior of the code. 2

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Why TDD? • TDD gives you higher conﬁdence that your code is doing what it's suppose to. • Small wins makes the coding process more enjoyable (Gamiﬁcation). • Working code every step of the way! 4

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TDD Process 1 Feature speciﬁcations 2 Write test cases 3 Tests will fail 4 Write code to pass the tests (minimal) 5 Pass all tests 6 Refactor "Make it green, then make it clean" 5

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• PHPUnit is the de-facto standard for unit testing in PHP projects. It provides both a framework that makes the writing of tests easy as well as the functionality to easily run the tests and analyse their results. • http://phpunit.de • Created by Sebastian Bergmann 6

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WordPress Unit Tests • Core libraries unit tests • http://unit-tests.trac.wordpress.org/wiki • Plugins Development • Nikolay Bachiyski (https://github.com/nb/wordpress- tests) • Themes Development • http://codex.wordpress.org/Theme_Unit_Test 7

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WordPress Unit Tests • Nikolay Bachiyski • https://github.com/nb/ wordpress-tests • http://wordpress.tv/ 2011/08/20/nikolay- bachiyski-unit-testing-will- change-your-life/ 8

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Demo 9

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Demo Script • Installing PHPUnit. • Checkout unit tests • Sample Unit Test for a WP Plugin. 10

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Installing PHPUnit # pear config-set auto_discover 1 # pear install pear.phpunit.de/PHPUnit 11