$user->addCredential('supplier');
$t->is($user->hasCredential($credential), false, '->hasCredential() can takes an array of credential as a parameter');
$user->addCredential('owner');
$t->is($user->hasCredential($credential), true, '->hasCredential() can takes an array of credential as a parameter');
$user->addCredential('quasiowner');
$t->is($user->hasCredential($credential), true, '->hasCredential() can takes an array of credential as a parameter');
$user->removeCredential('owner');
$t->is($user->hasCredential($credential), true, '->hasCredential() can takes an array of credential as a parameter');
$user->removeCredential('supplier');
$t->is($user->hasCredential($credential), false, '->hasCredential() can takes an array of credential as a parameter');
$user->clearCredentials();
$user->addCredential('admin');
$user->addCredential('user');
$t->is($user->hasCredential('admin'), true);
$t->is($user->hasCredential('user'), true);
$user->addCredentials('superadmin', 'subscriber');
$t->is($user->hasCredential('subscriber'), true);
$t->is($user->hasCredential('superadmin'), true);
// admin and (user or subscriber)
$t->is($user->hasCredential(array(array('admin', array('user', 'subscriber')))), true);
$user->addCredentials(array('superadmin1', 'subscriber1'));
$t->is($user->hasCredential('subscriber1'), true);
$t->is($user->hasCredential('superadmin1'), true);
// admin and (user or subscriber) and (superadmin1 or subscriber1)
$t->is($user->hasCredential(array(array('admin', array('user', 'subscriber'), array('superadmin1', 'subscriber1')))), true);
// numerical credentials
$user->clearCredentials();
$user->addCredentials(array('1', 2));
$t->is($user->hasCredential(1), true, '->hasCrendential() supports numerical credentials');
$t->is($user->hasCredential('2'), true, '->hasCrendential() supports numerical credentials');
$t->is($user->hasCredential(array('1', 2)), true, '->hasCrendential() supports numerical credentials');
