full visitor pattern withh double dispatch

Tests/Visitor/VisitorTest.php

@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * DesignPatternPHP
+ */
+
+namespace DesignPatterns\Tests\Visitor;
+
+use DesignPatterns\Visitor;
+
+/**
+ * VisitorTest tests the visitor pattern
+ */
+class VisitorTest extends \PHPUnit_Framework_TestCase
+{
+
+    protected $visitor;
+
+    protected function setUp()
+    {
+        $this->visitor = new Visitor\RolePrintVisitor();
+    }
+
+    public function getRole()
+    {
+        return array(
+            array(new Visitor\User("Dominik"), 'Role: User Dominik'),
+            array(new Visitor\Group("Administrators"), 'Role: Group: Administrators')
+        );
+    }
+
+    /**
+     * @dataProvider getRole
+     */
+    public function testVisitSomeRole(Visitor\Role $role, $expect)
+    {
+        $this->expectOutputString($expect);
+        $role->accept($this->visitor);
+    }
+
+    /**
+     * @expectedException InvalidArgumentException
+     * @expectedExceptionMessage Mock
+     */
+    public function testUnknownObject()
+    {
+        $mock = $this->getMockForAbstractClass('DesignPatterns\Visitor\Role');
+        $mock->accept($this->visitor);
+    }
+
+}