amp/test/unit/ReactorFactoryTest.php

<?php

use Alert\ReactorFactory;

class ReactorFactoryTest extends PHPUnit_Framework_TestCase {

    function testSelectReturnsLibeventReactorIfExtensionLoaded() {
        if (!extension_loaded('libevent')) {
            $this->markTestSkipped(
                'libevent extension not available'
            );
        }

        $rf = new ReactorFactory;
        $reactor = $rf->select();
        $this->assertInstanceOf('Alert\LibeventReactor', $reactor);
    }

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

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

}