Factory Method

CarFactoryTest.php

<?php namespace Pattern\FactoryMethod;

use Pattern\FactoryMethod\Car\Galaxy;
use PHPUnit_Framework_TestCase;

class CarFactoryTest extends PHPUnit_Framework_TestCase {

  private $factory;

  public function setUp()
  {
    $this->factory = $this->getMockForAbstractClass(CarFactory::class, [
      ['galaxy' => Galaxy::class]
    ]);
  }

  /**
   * @covers Pattern\FactoryMethod\CarFactory::__construct
   * @covers Pattern\FactoryMethod\CarFactory::make
   * @expectedException \InvalidArgumentException
   * @expectedExceptionMessage You tried to make a nonexistent car
   */
  public function testShouldThrowAnExceptionWhenTryingToMakeANonexistentCar()
  {
    $this->factory->make('nonexistent');
  }

  /**
   * @covers Pattern\FactoryMethod\CarFactory::__construct
   * @covers Pattern\FactoryMethod\CarFactory::make
   * @uses Pattern\FactoryMethod\Car
   */
  public function testShouldMakeAndReturnTheExpectedCar()
  {
    $car = $this->factory->make('galaxy');

    $this->assertInstanceOf(Car::class, $car);
  }

}

CarStoreTest.php

<?php namespace Pattern\FactoryMethod;

use PHPUnit_Framework_TestCase;

class CarStoreTest extends PHPUnit_Framework_TestCase {

  /**
   * @covers Pattern\FactoryMethod\CarStore::__construct
   * @covers Pattern\FactoryMethod\CarStore::order
   * @uses Pattern\FactoryMethod\CarFactory
   */
  public function testShouldCallFactoriesMakeMethod()
  {
    $factory = $this->getMockBuilder(CarFactory::class)
                    ->setConstructorArgs([[]])
                    ->setMethods(['make'])
                    ->getMockForAbstractClass();

    $factory->expects($this->once())->method('make')->with('galaxy');

    $store = new CarStore($factory);
    $store->order('galaxy');
  }

}