create a Test folder for each pattern

Structural/Decorator/Tests/DecoratorTest.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace DesignPatterns\Structural\Decorator\Tests;
+
+use DesignPatterns\Structural\Decorator;
+
+/**
+ * DecoratorTest tests the decorator pattern
+ */
+class DecoratorTest extends \PHPUnit_Framework_TestCase
+{
+
+    protected $service;
+
+    protected function setUp()
+    {
+        $this->service = new Decorator\Webservice(array('foo' => 'bar'));
+    }
+
+    public function testJsonDecorator()
+    {
+        // Wrap service with a JSON decorator for renderers
+        $service = new Decorator\RenderInJson($this->service);
+        // Our Renderer will now output JSON instead of an array
+        $this->assertEquals('{"foo":"bar"}', $service->renderData());
+    }
+
+    public function testXmlDecorator()
+    {
+        // Wrap service with a JSON decorator for renderers
+        $service = new Decorator\RenderInXml($this->service);
+        // Our Renderer will now output XML instead of an array
+        $xml = '<?xml version="1.0"?><foo>bar</foo>';
+        $this->assertXmlStringEqualsXmlString($xml, $service->renderData());
+    }
+
+    /**
+     * The first key-point of this pattern :
+     */
+    public function testDecoratorMustImplementsRenderer()
+    {
+        $className = 'DesignPatterns\Structural\Decorator\Decorator';
+        $interfaceName = 'DesignPatterns\Structural\Decorator\RendererInterface';
+        $this->assertTrue(is_subclass_of($className, $interfaceName));
+    }
+
+    /**
+     * Second key-point of this pattern : the decorator is type-hinted
+     * 
+     * @expectedException \PHPUnit_Framework_Error
+     */
+    public function testDecoratorTypeHinted()
+    {
+        $this->getMockForAbstractClass('DesignPatterns\Structural\Decorator\Decorator', array(new \stdClass()));
+    }
+
+    /**
+     * The decorator implements and wraps the same interface
+     */
+    public function testDecoratorOnlyAcceptRenderer()
+    {
+        $mock = $this->getMock('DesignPatterns\Structural\Decorator\RendererInterface');
+        $dec = $this->getMockForAbstractClass('DesignPatterns\Structural\Decorator\Decorator', array($mock));
+        $this->assertNotNull($dec);
+    }
+}