<?php

/**
 * For brevity I use public fields instead of getters and setters.
 */
class User
{
    public $location;
    public $latitude;
    public $longitude;
}

class GoogleMaps
{
    public function getLatitudeAndLongitude($location)
    {
        // some obscure network code to contact maps.google.com
        // ...
        return array('latitude' => $someValue, 'longitude' => $someOtherValue);
    }
}

class GeolocationService
{
    private $_maps;

    public function __construct(GoogleMaps $maps)
    {
        $this->_maps = $maps;
    }

    public function locate(User $user)
    {
        $location = $user->location;
        if ($location === null) {
            $location = 'Milan';
        }
        $coordinates = $this->_maps->getLatitudeAndLongitude($location);
        $user->latitude = $coordinates['latitude'];
        $user->longitude = $coordinates['longitude'];
    }
}

class GeolocationServiceTest extends PHPUnit_Framework_TestCase
{
    public function testProvidesLatitudeAndLongitudeForAnUser()
    {
        $coordinates = array('latitude' => '42N', 'longitude' => '12E');
        $googleMapsMock = $this->getMock('GoogleMaps', array('getLatitudeAndLongitude'));
        $googleMapsMock->expects($this->any())
                       ->method('getLatitudeAndLongitude')
                       ->will($this->returnValue($coordinates));
        $service = new GeolocationService($googleMapsMock);
        $user = new User;
        $user->location = 'Rome';
        $service->locate($user);
        $this->assertEquals('42N', $user->latitude);
        $this->assertEquals('12E', $user->longitude);
    }
}