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.. index:: single: Getting Started; Simple Example Simple Example ============== Imagine we have a ``Temperature`` class which samples the temperature of a locale before reporting an average temperature. The data could come from a web service or any other data source, but we do not have such a class at present. We can, however, assume some basic interactions with such a class based on its interaction with the ``Temperature`` class: .. code-block:: php class Temperature { private $service; public function __construct($service) { $this->service = $service; } public function average() { $total = 0; for ($i=0; $i<3; $i++) { $total += $this->service->readTemp(); } return $total/3; } } Even without an actual service class, we can see how we expect it to operate. When writing a test for the ``Temperature`` class, we can now substitute a mock object for the real service which allows us to test the behaviour of the ``Temperature`` class without actually needing a concrete service instance. .. code-block:: php use \Mockery; class TemperatureTest extends \PHPUnit\Framework\TestCase { public function tearDown() { Mockery::close(); } public function testGetsAverageTemperatureFromThreeServiceReadings() { $service = Mockery::mock('service'); $service->shouldReceive('readTemp') ->times(3) ->andReturn(10, 12, 14); $temperature = new Temperature($service); $this->assertEquals(12, $temperature->average()); } } We create a mock object which our ``Temperature`` class will use and set some expectations for that mock — that it should receive three calls to the ``readTemp`` method, and these calls will return 10, 12, and 14 as results. .. note:: PHPUnit integration can remove the need for a ``tearDown()`` method. See ":doc:`/reference/phpunit_integration`" for more information.