function testCanModifyRegisterSet()
{
$this->svc->addSuccessMessage(['s2', 's3']);
$this->svc->addErrorMessage(['e1', 'e2', 'e3']);
$set = $this->svc->loadRegisters();
$this->assertEquals(['s2', 's3'], $set->success);
$this->assertEquals(['e1', 'e2', 'e3'], $set->error);
// will be filtered
$set->success = ['', 's2'];
$set->error = ['e1', false];
$set->notice = ['n1', 'n2'];
$set->invalid = true;
$this->svc->saveRegisters($set);
$this->assertEquals(['success' => ['s2']], $this->svc->dumpRegister('success'));
$this->assertEquals(['error' => ['e1']], $this->svc->dumpRegister('error'));
$this->assertEquals(['notice' => ['n1', 'n2']], $this->svc->dumpRegister());
}