我已经开始在构建中加入单元测试。我有一个创建数据库表和数据库版本选项的类。

我不知道如何测试是否正在创建表和选项。这是课程

class Safety_links_Create_Database {

    public function __construct() {
        $this->create_db();
    }

    /**
     * Get the databse version
     * @return string the databse version
     */
    public function get_db_version() {
        $database_version = SAFETY_LINKS_DB_VERSION;
        return $database_version;
    }


    public function get_table_name() {
        $table_name = SAFETY_LINKS_DB_TABLE_NAME;
        return $table_name;
    }

    public function get_db_option_name() {
        $option_name = SAFETY_LINKS_DB_OPTION_NAME;
        return $option_name;
    }

    public function get_charset() {
        $charset = SAFETY_LINKS_DB_CHARSET_NAME;
        return $charset;
    }

    public function check_table_name() {
        $table_name = $this->get_table_name();
        $check_name = $GLOBALS[\'wpdb\']->get_var("show tables like \'$table_name\'");
        if( $check_name != $table_name ) {
            return true;
        } 
        return false;
    }

    public function create_db() {
        global $wpdb;
        $table_name = $this->get_table_name();
        $charset =  $this->get_charset();

        if( $wpdb->get_var( "SHOW TABLES LIKE \'$table_name\'" ) != $table_name ) {
            $sql = "CREATE TABLE $table_name (
                id mediumint(9) NOT NULL AUTO_INCREMENT,
                ulr VARCHAR(2083) NOT NULL,
                code smallint(3) NOT NULL,
                body tinytext NOT NULL,
                date datetime DEFAULT \'0000-00-00 00:00:00\' NOT NULL,
                UNIQUE KEY id (id)
            ) $charset;";

            require_once( ABSPATH . \'wp-admin/includes/upgrade.php\' );
            dbDelta($sql);
            if( !get_option( $this->get_db_option_name() ) ) {
                add_option( $this->get_db_option_name(), $this->get_db_version() );
            }
        }
    }
}