public function testCategoryAccessors()
{
$message = new SendGrid\Mail();
$message->setCategory('category_0');
$this->assertEquals("{\"category\":[\"category_0\"]}", $message->getHeadersJson());
$categories = array("category_1", "category_2", "category_3", "category_4");
$message->setCategories($categories);
$header = $message->getHeaders();
// ensure that the array is the same
$this->assertEquals($categories, $header['category']);
// uses valid json
$this->assertEquals("{\"category\":[\"category_1\",\"category_2\",\"category_3\",\"category_4\"]}", $message->getHeadersJson());
// ensure that addCategory appends to the list of categories
$category = "category_5";
$message->addCategory($category);
$header = $message->getHeaders();
$this->assertEquals(5, count($header['category']));
$categories[] = $category;
$this->assertEquals($categories, $header['category']);
// removeCategory removes all occurrences of a category
$message->removeCategory("category_3");
$header = $message->getHeaders();
unset($categories[2]);
$categories = array_values($categories);
$this->assertEquals(4, count($header['category']));
$this->assertEquals($categories, $header['category']);
}
