mocking - Mockup 对象的断言失败

Question

我在 PHPUnit 中模拟对象时遇到问题：

class FootballTest extends PHPUnit_Framework_TestCase
{
    /**
     * @var Football
     */
    protected $object;

    /**
     * Sets up the fixture, for example, opens a network connection.
     * This method is called before a test is executed.
     */
    protected function setUp()
    {
        $this->siteName = 'football';
        $this->footballAPIMock = $this->getMock('FootballAPI');
        $this->object = new Football($this->siteName,$this->footballAPIMock);
    }

    /**
     * Tears down the fixture, for example, closes a network connection.
     * This method is called after a test is executed.
     */
    protected function tearDown()
    {
        $this->object = null;
    }


    public function testGetByTeamOutrights()
    {
        $markets = 5;
        $this->footballAPIMock->expects($this->any())
                             ->method('getByTeamOutrights')
                             ->with($this->equalTo(5))
                             ->will($this->returnValue(5));

        $this->assertNull($this->object->getByTeamOutrights(5));

    }
}

而且我断言那个足球对象失败了

PHPUnit 版本 3.6.12