Symfony\Component\Form\FormError::getMessage PHP Method

    public function getMessage()
    {
        return strtr($this->messageTemplate, $this->messageParameters);
    }

 public function it_return_json_with_error_message_when_form_data_is_not_valid_json(Request $request, Form $composerForm, FormError $composerFormError)
 {
     $composerForm->handleRequest($request)->shouldBeCalled();
     $composerForm->isValid()->shouldBeCalled()->willReturn(false);
     $composerForm->isValid()->shouldBeCalled()->willReturn(false);
     $composerForm->get('body')->shouldBeCalled()->willReturn($composerForm);
     $composerForm->getErrors()->shouldBeCalled()->willReturn(array($composerFormError));
     $composerFormError->getMessage()->shouldBeCalled()->willReturn('Please provide a composer.json');
     $this->uploadComposerAction($request)->shouldBeJsonResponse(array('status' => 'ko', 'message' => array('Please provide a composer.json')));
 }