WordPressのプラグインをPHPUnitでテストする

//WordPressインストールディレクトリへ移動
cd wptest
// sample-pluginという名前でプラグインのスカフォールドを作成
wp scaffold plugin sample-plugin

#!/usr/bin/env bash

#if [ $# -lt 3 ]; then
#	echo "usage: $0 <db-name> <db-user> <db-pass> [db-host] [wp-version] [skip-database-creation]"
#	exit 1
#fi

export WP_TESTS_DIR="/Applications/MAMP/htdocs/wordpress-tests-suit/wptest-tests"
export WP_CORE_DIR="/Applications/MAMP/htdocs/wordpress-tests-suit/wptest-core"

DB_NAME=${1-wordpress_test}
DB_USER=${2-root}
DB_PASS=${3-root}
DB_HOST=${4-127.0.0.1:8889}
WP_VERSION=${5-latest}
SKIP_DB_CREATE=${6-true}

composer require --dev phpunit/phpunit "^9.0"
No composer.json in current directory, do you want to use the one at /Applications/MAMP/htdocs/wptest? [Y,n]? n
./composer.json has been created
Running composer update phpunit/phpunit
Loading composer repositories with package information

composer require --dev yoast/phpunit-polyfills "^3.1"

{
    "require-dev": {
        "phpunit/phpunit": "^9.0",
        "yoast/phpunit-polyfills": "^3.1"
    },
    "autoload-dev": {
        "classmap": [
            "tests"
        ]
    }
}

<?xml version="1.0"?>
<phpunit
	bootstrap="tests/bootstrap.php"
	backupGlobals="false"
	colors="true"
	convertErrorsToExceptions="true"
	convertNoticesToExceptions="true"
	convertWarningsToExceptions="true"
	>
	<testsuites>
		<testsuite name="testing">
			<directory prefix="test-" suffix=".php">./tests/</directory>
			<!--<exclude>./tests/test-sample.php</exclude>-->
		</testsuite>
	</testsuites>
</phpunit>

<?php
/**
 * PHPUnit bootstrap file.
 *
 * @package Sample_Plugin
 */

// $_tests_dir = getenv( 'WP_TESTS_DIR' );
$_tests_dir = "/Applications/MAMP/htdocs/wordpress-tests-suit/wptest-tests";

./vendor/bin/phpunit
Installing...
Running as single site... To run multisite, use -c tests/phpunit/multisite.xml
Not running ajax tests. To execute these, use --group ajax.
Not running ms-files tests. To execute these, use --group ms-files.
Not running external-http tests. To execute these, use --group external-http.
PHPUnit 9.6.22 by Sebastian Bergmann and contributors.

.                                                                   1 / 1 (100%)

Time: 00:00.007, Memory: 38.50 MB

OK (1 test, 1 assertion)

<?php
/**
 * Class WP_Functions_Test
 *
 * @package Sample_Plugin
 */

/**
 * WordPress functions test cases.
 */
class WP_Functions_Test extends WP_UnitTestCase {

    /**
     * 投稿の作成と取得をテスト
     */
    public function test_create_and_get_post() {
        $post_data = array(
            'post_title'   => 'テスト投稿',
            'post_content' => 'これはテスト投稿の本文です。',
            'post_status'  => 'publish',
            'post_author'  => 1
        );

        // 投稿を作成
        $post_id = wp_insert_post($post_data);

        // 投稿が正常に作成されたか確認
        $this->assertNotEquals(0, $post_id);
        $this->assertGreaterThan(0, $post_id);

        // 作成した投稿を取得
        $post = get_post($post_id);

        // 投稿の内容を検証
        $this->assertEquals('テスト投稿', $post->post_title);
        $this->assertEquals('これはテスト投稿の本文です。', $post->post_content);
    }

    /**
     * カスタムフィールド（メタデータ）のテスト
     */
    public function test_post_meta() {
        // テスト用の投稿を作成
        $post_id = $this->factory->post->create();

        // メタデータを追加
        $meta_key = 'test_meta_key';
        $meta_value = 'テストメタ値';
        add_post_meta($post_id, $meta_key, $meta_value);

        // メタデータを取得して検証
        $saved_value = get_post_meta($post_id, $meta_key, true);
        $this->assertEquals($meta_value, $saved_value);

        // メタデータを更新
        $new_value = '新しいメタ値';
        update_post_meta($post_id, $meta_key, $new_value);

        // 更新されたメタデータを検証
        $updated_value = get_post_meta($post_id, $meta_key, true);
        $this->assertEquals($new_value, $updated_value);
    }

    /**
     * カスタム投稿タイプの登録と検証をテスト
     */
    public function test_custom_post_type() {
        // カスタム投稿タイプを登録
        register_post_type('test_cpt', array(
            'public' => true,
            'label'  => 'テストCPT'
        ));

        // カスタム投稿タイプが正しく登録されているか確認
        $post_type_object = get_post_type_object('test_cpt');
        $this->assertNotNull($post_type_object);
        $this->assertEquals('テストCPT', $post_type_object->label);

        // カスタム投稿タイプの投稿を作成
        $post_id = $this->factory->post->create(array(
            'post_type' => 'test_cpt'
        ));

        // 作成した投稿を取得して検証
        $post = get_post($post_id);
        $this->assertEquals('test_cpt', $post->post_type);
    }

    /**
     * タクソノミーとタームのテスト
     */
    public function test_taxonomy_and_terms() {
        // カスタムタクソノミーを登録
        register_taxonomy('test_tax', 'post', array(
            'hierarchical' => true,
            'label' => 'テストタクソノミー'
        ));

        // タームを作成
        $term_data = wp_insert_term('テストターム', 'test_tax');
        $this->assertNotWPError($term_data);
        $term_id = $term_data['term_id'];

        // 投稿を作成
        $post_id = $this->factory->post->create();

        // 投稿にタームを設定
        wp_set_object_terms($post_id, $term_id, 'test_tax');

        // 投稿に設定されたタームを取得して検証
        $terms = wp_get_object_terms($post_id, 'test_tax');
        $this->assertCount(1, $terms);
        $this->assertEquals('テストターム', $terms[0]->name);
    }
}

./vendor/bin/phpunit
Installing...
Running as single site... To run multisite, use -c tests/phpunit/multisite.xml
Not running ajax tests. To execute these, use --group ajax.
Not running ms-files tests. To execute these, use --group ms-files.
Not running external-http tests. To execute these, use --group external-http.
PHPUnit 9.6.22 by Sebastian Bergmann and contributors.

.....                                                               5 / 5 (100%)

Time: 00:00.045, Memory: 38.50 MB

OK (5 tests, 13 assertions)

<?xml version="1.0"?>
<phpunit
	bootstrap="tests/bootstrap.php"
	backupGlobals="false"
	colors="true"
	convertErrorsToExceptions="true"
	convertNoticesToExceptions="true"
	convertWarningsToExceptions="true"
	>
	<testsuites>
		<testsuite name="testing">
			<directory>./tests/</directory>
		</testsuite>
	</testsuites>
</phpunit>