add test cases to serialize form errors to json

tests/JMS/Serializer/Tests/Handler/FormErrorHandlerTest.php

@@ -0,0 +1,110 @@
+<?php
+
+namespace JMS\Serializer\Tests\Handler;
+
+use JMS\Serializer\JsonSerializationVisitor;
+use JMS\Serializer\Handler\FormErrorHandler;
+use JMS\Serializer\Naming\CamelCaseNamingStrategy;
+use JMS\Serializer\Naming\SerializedNameAnnotationStrategy;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Form\FormBuilder;
+use Symfony\Component\Form\FormError;
+use Symfony\Component\Translation\Translator;
+
+class FormErrorHandlerTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var \JMS\Serializer\Handler\FormErrorHandler
+     */
+    protected $handler;
+
+    /**
+     * @var \JMS\Serializer\VisitorInterface
+     */
+    protected $visitor;
+
+    /**
+     * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface
+     */
+    protected $dispatcher;
+
+    /**
+     * @var \Symfony\Component\Form\FormFactoryInterface
+     */
+    protected $factory;
+
+    public function setUp()
+    {
+        $this->handler = new FormErrorHandler(new Translator('en'));
+        $this->visitor = new JsonSerializationVisitor(new SerializedNameAnnotationStrategy(new CamelCaseNamingStrategy()));
+        $this->dispatcher = new EventDispatcher();
+        $this->factory = $this->getMock('Symfony\Component\Form\FormFactoryInterface');
+    }
+
+    protected function tearDown()
+    {
+        $this->handler = null;
+        $this->visitor = null;
+        $this->dispatcher = null;
+        $this->factory = null;
+    }
+
+    public function testSerializeEmptyFormError()
+    {
+        $form = $this->createForm();
+        $json = json_encode($this->handler->serializeFormToJson($this->visitor, $form, array()));
+
+        $this->assertSame('{}', $json);
+    }
+
+    public function testSerializeHasFormError()
+    {
+        $form = $this->createForm();
+        $form->addError(new FormError('error!'));
+        $json = json_encode($this->handler->serializeFormToJson($this->visitor, $form, array()));
+
+        $this->assertSame(json_encode(array(
+            'errors' => array(
+                'error!',
+            ),
+        )), $json);
+    }
+
+    /**
+     * @param string                   $name
+     * @param EventDispatcherInterface $dispatcher
+     * @param string                   $dataClass
+     *
+     * @return FormBuilder
+     */
+    protected function getBuilder($name = 'name', EventDispatcherInterface $dispatcher = null, $dataClass = null)
+    {
+        return new FormBuilder($name, $dataClass, $dispatcher ?: $this->dispatcher, $this->factory);
+    }
+
+    /**
+     * @param string $name
+     *
+     * @return \PHPUnit_Framework_MockObject_MockObject
+     */
+    protected function getMockForm($name = 'name')
+    {
+        $form = $this->getMock('Symfony\Component\Form\Test\FormInterface');
+        $config = $this->getMock('Symfony\Component\Form\FormConfigInterface');
+
+        $form->expects($this->any())
+            ->method('getName')
+            ->will($this->returnValue($name));
+        $form->expects($this->any())
+            ->method('getConfig')
+            ->will($this->returnValue($config));
+
+        return $form;
+    }
+
+    protected function createForm()
+    {
+        return $this->getBuilder()->getForm();
+    }
+}