/**

     * Return debugging messages from the current test.

     * @return array with instances having 'message', 'level' and 'stacktrace' property.

     */

    public function getDebuggingMessages();

    /**

     * Clear all previous debugging messages in current test.

     */

    public function resetDebugging();

    /**

     * Assert that exactly debugging was just called once.

     *

     * Discards the debugging message if successful.

     *

     * @param null|string $debugmessage null means any

     * @param null|string $debuglevel null means any

     * @param string $message

     */

    public function assertDebuggingCalled($debugmessage = null, $debuglevel = null, $message = '');

    /**

     * Call when no debugging() messages expected.

     * @param string $message

     */

    public function assertDebuggingNotCalled($message = '');