amp/test/ReactorFactoryTest.php

<?php

namespace Alert;

class ReactorFactoryTest extends \PHPUnit_Framework_TestCase {
    public function testSelectReturnsLibeventReactorIfExtensionLoaded() {
        if (extension_loaded('libevent')) {
            $rf = new ReactorFactory;
            $reactor = $rf->select();
            $this->assertInstanceOf('Alert\LibeventReactor', $reactor);
        } else {
            $this->markTestSkipped(
                'ext/libevent extension not loaded'
            );
        }
    }

    public function testMagicInvokeDelegatesToSelectMethod() {
        $rf = $this->getMock('Alert\ReactorFactory', ['select']);
        $rf->expects($this->once())
           ->method('select')
           ->will($this->returnValue(42));

        $this->assertEquals(42, $rf->__invoke());
    }
}