public function testExpired()
{
$collection = Braintree\CreditCard::expired();
$this->assertTrue($collection->maximumCount() > 1);
$arr = array();
foreach ($collection as $creditCard) {
$this->assertTrue($creditCard->isExpired());
array_push($arr, $creditCard->token);
}
$uniqueCreditCardTokens = array_unique(array_values($arr));
$this->assertEquals($collection->maximumCount(), count($uniqueCreditCardTokens));
}