Symfony\Component\Form\FieldGroup::isMultipart PHP Method

    public function isMultipart()
    {
        foreach ($this->fields as $field) {
            if ($field->isMultipart()) {
                return true;
            }
        }

        return false;
    }

 public function testIsNotMultipartIfNoFieldIsMultipart()
 {
     $group = new FieldGroup('author');
     $group->add($this->createNonMultipartMockField('firstName'));
     $group->add($this->createNonMultipartMockField('lastName'));
     $this->assertFalse($group->isMultipart());
 }