demo-plugin.php

<?php

/*
Plugin Name: Unit Testing Demo Plugin
Plugin URI: http://example.com
Description: Let's get started unit testing
Author: Me
Version: 0.1
Author URI: http://example.com
*/

class Demo_Plugin {

	protected $listing;
	protected $slug;
	protected $term_title;
	protected $term_object;
	protected $post_id;
	protected $taxonomy = 'category';

	function init() {

		$this->attach_hooks();

	}

	function attach_hooks() {

		add_action( 'save_post', array( $this, 'categorize_post' ), 10, 10 );

	}

	function categorize_post( $post_id ) {


		if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
			return;
		}

		if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
			return;
		}

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return;
		}

		if ( false !== wp_is_post_revision( $post_id ) ) {
			return;
		}

		$this->post_id = $post_id;
		$title         = get_the_title( $post_id );
		$this->get_listing();

		foreach ( $this->listing as $term_title => $slug ) {

			if ( strstr( $title, $term_title ) ) {

				$this->slug       = $slug;
				$this->term_title = $term_title;
				$this->process_term();

			}

		}

	}

	function process_term() {

		$this->term_object = get_term_by( 'slug', $this->slug, $this->taxonomy );
		if ( ! $this->term_object ) {
			$this->create_term();
		}
		if ( is_object( $this->term_object ) ) {
			wp_set_object_terms( $this->post_id, $this->term_object->term_id, $this->taxonomy, true );
		}


	}

	function create_term() {


		$this->term_object = wp_insert_term( $this->term_title, $this->taxonomy, array( 'slug' => $this->slug ) );


	}

	function get_listing() {


		$request = wp_remote_get( 'http://myapi.com/apiendpoint' );

		$this->listing = json_decode( wp_remote_retrieve_body( $request ) );


	}


}

if ( ! defined( WP_UNIT_TEST_ENVIRONMENT ) || ! WP_UNIT_TEST_ENVIRONMENT ) {

	add_action( 'init', array( new Demo_Plugin, 'init' ) );

}

test-demo-plugin.php

<?php

class Demo_Test extends WP_UnitTestCase {


	function test_init() {

		$demo_plugin = $this->getMockBuilder( 'Demo_Plugin' )
			->disableOriginalConstructor()
			->setMethods( array( 'attach_hooks' ) )
			->getMock();

		$demo_plugin->expects( $this->once() )
			->method( 'attach_hooks' );

		$demo_plugin->init();


	}

	function test_attach_hooks() {


		$demo_plugin = new Demo_Plugin;
		$demo_plugin->attach_hooks();

		$this->assertEquals( 10, has_action( 'save_post', array( $demo_plugin, 'categorize_post' ) ) );

	}

	function provider_test_categorize_post() {

		return array(
			array( 'Matt Harvey plays catch', 1 ),
			array( 'Everyone Happy that Matt Harvey has successful Bullpen Session', 1 ),
			array( 'Mets Lose, Daniel Murphy Shoulders the Blame', 1 ),
			array( 'Daniel Murphy and Matt Harvey Headline Mets Charity', 2 ),
			array( 'iON offers Mets fans a view never seen before', 0 ),
		);

	}


	/**
	 * @dataProvider provider_test_categorize_post
	 */
	function test_categorize_post( $title, $process_term_expects ) {

		$post_id = $this->factory->post->create( array( 'post_title' => $title ) );
		$user_id = $this->factory->user->create( array( 'role' => 'administrator' ) );
		wp_set_current_user( $user_id );

		$demo_plugin = $this->getMockBuilder( 'Demo_Plugin' )
			->disableOriginalConstructor()
			->setMethods( array( 'process_term', 'get_listing' ) )
			->getMock();

		$reflection          = new ReflectionClass( $demo_plugin );
		$reflection_property = $reflection->getProperty( 'listing' );
		$reflection_property->setAccessible( true );

		$reflection_property->setValue( $demo_plugin, array( 'Matt Harvey' => 'matt-harvey', 'Daniel Murphy' => 'daniel-murphy' ) );


		$demo_plugin->expects( $this->exactly( $process_term_expects ) )
			->method( 'process_term' );

		$demo_plugin->expects( $this->once() )
			->method( 'get_listing' )
			->will( $this->returnValue( array( 'Matt Harvey' => 'matt-harvey', 'Daniel Murphy' => 'daniel-murphy' ) ) );

		$demo_plugin->categorize_post( $post_id );


	}

}