Output is not cleared after specify #10

public function testSomething()
{
    $this->specify(
        'expect output',
        function () {
            $this->expectOutputString('lorem ipsum');
            (new TestedClass)->doSomething();
        }
    );
    $this->specify(
        'expect another output',
        function () {
            $this->expectOutputString('lorem ipsum');
            (new TestedClass)->doSomethingElse();
        }
    );
}