create a Test folder for each pattern

Structural/Adapter/Tests/AdapterTest.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace DesignPatterns\Structural\Adapter\Tests;
+
+use DesignPatterns\Structural\Adapter\EBookAdapter;
+use DesignPatterns\Structural\Adapter\Kindle;
+use DesignPatterns\Structural\Adapter\PaperBookInterface;
+use DesignPatterns\Structural\Adapter\Book;
+
+/**
+ * AdapterTest shows the use of an adapted e-book that behave like a book
+ * You don't have to change the code of your client
+ */
+class AdapterTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @return array
+     */
+    public function getBook()
+    {
+        return array(
+            array(new Book()),
+            // we build a "wrapped" electronic book in the adapter
+            array(new EBookAdapter(new Kindle()))
+        );
+    }
+
+    /**
+     * This client only knows paper book but surprise, surprise, the second book
+     * is in fact an electronic book, but both work the same way
+     *
+     * @param PaperBookInterface $book
+     *
+     * @dataProvider getBook
+     */
+    public function testIAmAnOldClient(PaperBookInterface $book)
+    {
+        $book->open();
+        $book->turnPage();
+    }
+}