Set protected property on PHPUnit mock object

假設有個 class：

class Woker
{
    protected Queue $queue;

    public function run()
    {
        while (!$this->queue->isEmpty()) {
            $job = $this->queue->pop();
            // do something
        }
    }
}

用 PHPUnit 建立 stub 以後，必須使用 reflection 來自訂 $queue property：

$worker = $this->getMockBuilder(Worker::class)
    ->disableOriginalConstructor()
    ->getMock();

$queue = $this->createMock(Queue::class);
$queue->expected($this->atLeast(1))
    ->method('isEmpty')
    ->willReturn(true);

// PHP Reflection on $worker
$refProperty = new \ReflectionProperty($worker, 'queue');
$refProperty->setAccessible(true);
$refProperty->setValue($crawler, $queue);

這樣寫 test case 蠻髒的，有點想要換 test framework ….