public function describe($title, \Closure $closure)
    {
        $previous = $this->current;
        $suite = new Suite($title, $closure, $previous);

        if ($this->current === $this->root) {
            $this->suites[] = $suite;
        } else {
            $this->current->addSuite($suite);
        }

        $this->current = $suite;
        $suite->getClosure()->__invoke();
        $this->current = $previous;
    }