Temperature::average PHP Method

    public function average()
    {
        $total = 0;
        for ($i = 0; $i < 3; ++$i) {
            $total += $this->_service->readTemp();
        }
        return $total / 3;
    }

 /** @test */
 public function simpleStubWithPhake()
 {
     $service = \Phake::mock('\\Acme\\ServiceInterface');
     \Phake::when($service)->readTemp()->thenReturn(10)->thenReturn(12)->thenReturn(14);
     $temperature = new Temperature($service);
     $this->assertEquals(12, $temperature->average());
 }