WordPressのPHPUnitによる単体テストのサンプルです。

wp-unit-test-sample.php

<?php
/**
 * WP_UnitTestCaseのサンプル
 *
 * @package   InfoTown
 * @author    Hiroshi Sawai <info@info-town.jp>
 * @copyright Hiroshi Sawai
 */
class Sample_Test extends WP_UnitTestCase {

	/**
	 * 単一ページテスト
	 *
	 * @link http://qiita.com/miya0001/items/8f1a777b455a8bdcbd62
	 */
	public function test_the_title() {
		$post = $this->post_ids = $this->factory->post->create_and_get( [
			'post_title' => 'Sample Post!',
		] );
		$this->go_to( '/?p=' . $post->ID );
		$this->assertTrue( is_single() );
		$this->expectOutputString( "Sample Post!" );
		the_title();
	}

	/**
	 * アーカイブテスト
	 */
	public function test_single_cat_title() {
		$cat = $this->factory->category->create_and_get( [ 'name' => 'Sample Category' ] );
		$this->factory->post->create( [ 'post_category' => [ $cat->term_id ] ] );
		$this->go_to( '/?cat=' . $cat->term_id );
		$this->assertTrue( is_archive() );
		$this->assertFalse( is_single() );
		$this->expectOutputString( "Sample Category" );
		single_cat_title();
	}
}