Tests the major plot point of Mercyful Fate's tune Melissa

KingDiamondTest.php

<?php

namespace MercyfulFate;
use MercyfulFate\KingDiamond;

class KingDiamondTest extends \PHPUnit_Framework_TestCase
{
    /**
     * @var MercyfulFate\Priest
     */
    private $_priest;
    
    /**
     * @var MercyfulFate\Witch\Melissa
     */
    private $_witch;

    /**
     * @var MercyfulFate\KingDiamond
     */
    private $_king;
    
    public function setUp()
    {
        $this->_priest = $this->getMock('MercyfulFate\Priest');
        $this->_witch = $this->getMock('MercyfulFate\Witch\Melissa');
        $this->_king = new KingDiamond();
    }
    
    public function testKingSwearsRevengeOnPriest()
    {
        $this->assertFalse($this->_king->swearsRevenge($this->_priest));
        
        $this->_priest->expects($this->once())
            ->method('burnAtStake')
            ->with($this->_witch);
        $this->_priest->burnAtStake($this->_witch);
        
        $this->assertTrue($this->_king->swearsRevenge($this->_priest));
    }
}