public function testSetAttachmentCustomFilename()
{
$email = new Email();
//Setting an attachment removes all other files
$email->setAttachment("only_attachment.sad", "different");
$attachments = $email->getAttachments();
$this->assertEquals(1, count($attachments));
$this->assertEquals($attachments[0]['custom_filename'], 'different');
//Remove an attachment
$email->removeAttachment("only_attachment.sad");
$this->assertEquals(0, count($email->getAttachments()));
}