create a Test folder for each pattern

Structural/FluentInterface/Tests/FluentInterfaceTest.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace DesignPatterns\Structural\FluentInterface\Tests;
+
+use DesignPatterns\Structural\FluentInterface\Sql;
+
+/**
+ * FluentInterfaceTest tests the fluent interface SQL
+ */
+class FluentInterfaceTest extends \PHPUnit_Framework_TestCase
+{
+
+    public function testBuildSQL()
+    {
+        $instance = new Sql();
+        $query = $instance->select(array('foo', 'bar'))
+                ->from('foobar', 'f')
+                ->where('f.bar = ?')
+                ->getQuery();
+
+        $this->assertEquals('SELECT foo,bar FROM foobar AS f WHERE f.bar = ?', $query);
+    }
+}