add FieldDescriptionCollection test

Tests/Admin/FieldDescriptionCollectionTest.php

@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of the Sonata package.
+ *
+ * (c) Thomas Rabaix <thomas.rabaix@sonata-project.org>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Sonata\AdminBundle\Tests\Admin;
+
+use Sonata\AdminBundle\Admin\FieldDescriptionCollection;
+use Sonata\AdminBundle\Admin\FieldDescriptionInterface;
+
+class FieldDescriptionCollectionTest extends \PHPUnit_Framework_TestCase
+{
+    public function testMethods()
+    {
+        $collection = new FieldDescriptionCollection();
+
+        $fieldDescription = $this->getMock('Sonata\AdminBundle\Admin\FieldDescriptionInterface');
+        $fieldDescription->expects($this->once())->method('getName')->will($this->returnValue('title'));
+        $collection->add($fieldDescription);
+
+        $fieldDescription = $this->getMock('Sonata\AdminBundle\Admin\FieldDescriptionInterface');
+        $fieldDescription->expects($this->once())->method('getName')->will($this->returnValue('position'));
+        $collection->add($fieldDescription);
+
+        $this->assertFalse($collection->has('foo'));
+        $this->assertFalse(isset($collection['foo']));
+        $this->assertTrue($collection->has('title'));
+        $this->assertTrue(isset($collection['title']));
+
+        $this->assertCount(2, $collection->getElements());
+        $this->assertCount(2, $collection);
+
+        $this->isInstanceOf('Sonata\AdminBundle\Admin\FieldDescriptionInterface', $collection['title']);
+        $this->isInstanceOf('Sonata\AdminBundle\Admin\FieldDescriptionInterface', $collection->get('title'));
+
+        $collection->remove('title');
+        $this->assertFalse($collection->has('title'));
+
+        unset($collection['position']);
+
+        $this->assertCount(0, $collection->getElements());
+        $this->assertCount(0, $collection);
+    }
+
+    /**
+     * @expectedException        InvalidArgumentException
+     * @expectedExceptionMessage Element "foo" does not exist.
+     */
+    public function testNonExistentField()
+    {
+        $collection = new FieldDescriptionCollection();
+        $collection->get('foo');
+    }
+
+    /**
+     * @expectedException        RunTimeException
+     * @expectedExceptionMessage Cannot set value, use add
+     */
+    public function testArrayAccessSetField()
+    {
+        $collection = new FieldDescriptionCollection();
+        
+        $collection['foo'] = null;
+    }
+}