Mockery 解决“PHP单元测试中类方法强依赖问题”

<?php
namespace App;

class Service
{
    function callExternalService($param)
    {
        $externalService = new Service\External();
        $externalService->sendSomething($param);
        return $externalService->getSomething();
    }
}

<?php
namespace AppTest;
use Mockery as m;
/**
 * @runTestsInSeparateProcesses
 * @preserveGlobalState disabled
 */
class ServiceTest extends \PHPUnit_Framework_TestCase {
    public function testCallingExternalService()
    {
        $param = 'Testing';
 
        $externalMock = m::mock('overload:App\Service\External');
        $externalMock->shouldReceive('sendSomething')
            ->once()
            ->with($param);
        $externalMock->shouldReceive('getSomething')
            ->once()
            ->andReturn('Tested!');
 
        $service = new \App\Service();
 
        $result = $service->callExternalService($param);
 
        $this->assertSame('Tested!', $result);
    }
}