$g = new Chart();
$g->setFormat('png');
$g->setKilometersTo(12423);
$g->setUserId($ut->getUserId('ruf'));
$g->link('Vehicles', array($ut->getVehicleId('vw-touran-1-4-tsi')));
$g->link('Categories', array($ut->getIdForCategory('Tax')));
$g->save();
$sha1 = $g->getHash();
$t->isa_ok($sha1, 'string', '->save() creates a sha for each chart');
$g->setKilometersFrom(235);
$g->save();
$sha2 = $g->getHash();
$t->cmp_ok($sha1, '!=', $sha2, '->save() The hash field is updated each time the object is changed');
$g = new Chart();
$g->setFormat('png');
$g->setKilometersTo(12423);
$g->setUserId($ut->getUserId('ruf'));
$g->link('Vehicles', array($ut->getVehicleId('vw-touran-1-4-tsi')));
$g->link('Categories', array($ut->getIdForCategory('Fuel')));
$sha = $g->getHash();
$g2 = new Chart();
$g2->setUserId($ut->getUserId('ruf'));
$g->save();
$finalsha = $g->getHash();
$t->isnt($sha, $finalsha, 'When saving the object, ->save() checks that a unique sha is set. If not, a new one is generated.');
// ->delete()
$t->diag('->delete()');
$g = new Chart();
$g->setUserId($ut->getUserId('ruf'));
$g->save();
$id = $g->getId();