public function testCategoryAccessors()
{
$email = new Email();
$email->setCategories(array('category_0'));
$this->assertEquals("{\"category\":[\"category_0\"]}", $email->getSmtpapi()->jsonString());
$categories = array("category_1", "category_2", "category_3", "category_4");
$email->setCategories($categories);
// uses valid json
$this->assertEquals("{\"category\":[\"category_1\",\"category_2\",\"category_3\",\"category_4\"]}", $email->getSmtpapi()->jsonString());
}
