可以不覆盖PHPUnit测试存根方法吗？

In my tests, I created a test stub for a class and mock the output of the method "save" to return a default value. I have this in my setUp() method to initiate before each test runs:

//  auth adapter
$this->authMock = $this->getMockBuilder('App\\Auth')
    ->disableOriginalConstructor()
    ->getMock();

// by defaut, we'll make authenticate return a FAIL result
$this->authMock
    ->method('authenticate')
    ->willReturn(0);

This is then inject into my service locator overwriting the one used by the app (the real App\Auth). However, during the actual tests, I may wish to change the output of that method

// here, we'll make authenticate return a SUCCESS result
$this->authMock
    ->method('authenticate')
    ->willReturn(1);

Anyway, once I identified the issue, for POC, I just put these one after the other and right enough it seems that PHPUnit doesn't allow me to overwrite the previously declared mocked method return value:

//  auth adapter
$this->authMock = $this->getMockBuilder('App\\Auth')
    ->disableOriginalConstructor()
    ->getMock();

// by defaut, we'll make authenticate return a FAIL result
$this->authMock
    ->method('authenticate')
    ->willReturn(0);

// here, we'll make authenticate return a SUCCESS result
$this->authMock
    ->method('authenticate')
    ->willReturn(1);

var_dump($this->authMock->authenticate()); exit; // returns 0 :(

I'm sure in the past I was able to do this. Unless it was a previous version of PHPUnit. Currently I'm using 4.8.*. Any way I can do this? By default I want authenticate to return FAIL, but some tests I may want to override this with SUCCESS (so act as though the user is authenticated)

I can't recall ever being able to mock the same method twice, so what I usually do is define a helper function:

protected function mockAuthResult($result = 0) {...}

Another option would be to define:

protected $authResult;

And then in your setUp:

$this->authResult = 0; // fail by default
$this->authMock
    ->method('authenticate')
    ->willReturn($this->authResult);

And then you can override it for individual tests.