public function testReturnPathDefaultValueWorks()
{
$message = new Message();
$this->assertEquals(['*****@*****.**' => null], $message->getReturnPath('*****@*****.**'), "Simple default email address as string does not work for getReturnPath().");
$this->assertEquals(['*****@*****.**' => null], $message->getReturnPath(['*****@*****.**', '*****@*****.**']), "Only first of the two default emails should have been set for getReturnPath().");
$this->assertEquals(['*****@*****.**' => null], $message->getReturnPath(['*****@*****.**']), "Simple array with one default email address should work with getReturnPath().");
}
