Phpunit，（）是马车？

class to be tested:

class Arithmetic
{
    public function mockme($param1 = 0, $param2 = 0)
    {
        echo 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF';die;
    }

    public function mockme2()
    {
        $this->mockme('a', 'b');
    }
}

to test it:

public function testMock()
{
    $mock = $this->getMock('Arithmetic', array('mockme'));
    $mock->expects($this->once())->method('mockme')->with();

    $mock->mockme2();
}

now it passes however not supposed to be. Why? The with() is given. I expect that no parameter must be passed to mockme() - so with() shouldve expected empty parameters. But now its like I didnt set it at all. In other words: if I set with(1,4) its a must to pass 1,4. If I set with('a'), its a must to pass 'a'. If I set nothing with() its a must not to pass anything (but it regards it like I didnt set any with())