How to write unit test in symfony3 - phpunit

Question

I want to know how to write standard unit test code for the below controller. I believe PHPUNIT is installed by default in symfony3 but I'm not sure how to execute it as well. Can someone guide me how to write testcontroller and execution command for symfony3 as well.
class RegistrationController extends Controller
{
/**
* #Route("/register", name="user_registration")
* #Security("has_role('ROLE_SUPER_ADMIN')")
*/
public function userAction(Request $request)
{
$user = new User();
$form = $this->createForm(UserType::class, $user);
$form->handleRequest($request);
if ($request->isMethod('POST') && $form->isValid()) {
$password = $this->get('security.password_encoder')
->encodePassword($user, $user->getPlainPassword());
$user->setPassword($password);
$em = $this->getDoctrine()->getManager();
$em->persist($user);
$em->flush();
$this->get('app.mailer')->sendUserCredentials($user);
$this->addFlash('notice', 'An account is created');
}
return $this->render('masteradmin/account/addUser.html.twig',
array('form' => $form->createView())
);
}
/**
* #Route(
* "/user/edit/{id}",
* requirements={"id" = "\d+"},
* name="user_edit"
* )
*/
public function editUserAction(User $user, Request $request)
{
if (!$this->get('security.authorization_checker')->isGranted('ROLE_SUPER_ADMIN')) {
throw new AccessDeniedException();
}
$em = $this->getDoctrine()->getManager();
$id = $request->attributes->get('id');
if (!$user = $em->getRepository('AppBundle:User')->findOneById($id)) {
throw new NotFoundHttpException('user details not found.');
}
$form = $this->createForm(UserType::class, $user)
->remove('plainPassword');
$form->handleRequest($request);
$data = $form->getData();
if ($form->isValid()) {
$em->persist($user);
$em->flush();
$this->addFlash('notice', 'Account information is updated');
return $this->redirectToRoute('user_list');
}
return $this->render(
'masteradmin/account/editUser.html.twig', ['form' => $form->createView()]
);
}