public function testGetUserByCommunicationKey()
{
$csid = InstructionControl::getChannelSetId(genSaneGuid());
$u = InstructionControl::getUser(null, $n);
$u = InstructionControl::getUser($u['login_key'], $n);
InstructionControl::setUserChannelset($u['id'], $csid);
$v = InstructionControl::getUserByCommunicationKey($csid, $u['communication_key']);
$this->assertEquals($u, $v);
$w = InstructionControl::getUserByCommunicationKey($csid, genSaneGuid());
$this->assertNull($w);
}
