wp/tests/phpunit/includes/class-wp-rest-test-configurable-controller.php

<?php
/**
 * Unit tests covering WP_REST_Controller functionality using a flexible schema.
 *
 * @package WordPress
 * @subpackage REST API
 * @since 5.4.0
 */

/**
 * WP_REST_Test_Configurable_Controller class.
 *
 * @group restapi
 *
 * @since 5.4.0
 */
class WP_REST_Test_Configurable_Controller extends WP_REST_Controller {

	/**
	 * Test schema.
	 *
	 * @since 5.4.0
	 *
	 * @var array $test_schema
	 */
	protected $test_schema;

	/**
	 * Class constructor.
	 *
	 * @since 5.4.0
	 *
	 * @param array $test_schema Schema for use in testing.
	 */
	public function __construct( $test_schema ) {
		$this->test_schema = $test_schema;
	}

	/**
	 * Provides the test schema.
	 *
	 * @since 5.4.0
	 *
	 * @return array Test schema.
	 */
	public function get_test_schema() {
		return $this->test_schema;
	}

	/**
	 * Get the item's schema, conforming to JSON Schema.
	 *
	 * @since 5.4.0
	 *
	 * @return array
	 */
	public function get_item_schema() {
		return $this->add_additional_fields_schema( $this->get_test_schema() );
	}
}