use constant instead of string

Tests/FactoryMethod/FactoryMethodTest.php

@@ -6,7 +6,9 @@
 
 namespace DesignPatterns\Tests\FactoryMethod;
 
-use DesignPatterns\FactoryMethod;
+use DesignPatterns\FactoryMethod\FactoryMethod;
+use DesignPatterns\FactoryMethod\GermanFactory;
+use DesignPatterns\FactoryMethod\ItalianFactory;
 
 /**
  * FactoryMethodTest tests the factory method pattern
@@ -14,20 +16,23 @@ use DesignPatterns\FactoryMethod;
 class FactoryMethodTest extends \PHPUnit_Framework_TestCase
 {
 
-    protected $type = array('cheap', 'fast');
+    protected $type = array(
+        FactoryMethod::CHEAP,
+        FactoryMethod::FAST
+    );
 
     public function getShop()
     {
         return array(
-            array(new FactoryMethod\GermanFactory()),
-            array(new FactoryMethod\ItalianFactory())
+            array(new GermanFactory()),
+            array(new ItalianFactory())
         );
     }
 
     /**
      * @dataProvider getShop
      */
-    public function testCreation(FactoryMethod\FactoryMethod $shop)
+    public function testCreation(FactoryMethod $shop)
     {
         // this test method acts as a client for the factory. We don't care
         // about the factory, all we know is it can produce vehicle
@@ -42,7 +47,7 @@ class FactoryMethodTest extends \PHPUnit_Framework_TestCase
      * @expectedException \InvalidArgumentException
      * @expectedExceptionMessage spaceship is not a valid vehicle
      */
-    public function testUnknownType(FactoryMethod\FactoryMethod $shop)
+    public function testUnknownType(FactoryMethod $shop)
     {
         $shop->create('spaceship');
     }