public function testSubscriberHash()
{
$MC_API_KEY = getenv('MC_API_KEY');
if (!$MC_API_KEY) {
$this->markTestSkipped('No API key in ENV');
}
$MailChimp = new MailChimp($MC_API_KEY);
$email = '*****@*****.**';
$expected = md5(strtolower($email));
$result = $MailChimp->subscriberHash($email);
$this->assertEquals($expected, $result);
}