public function testDiff()
{
$columnBag = with(new \mechanicious\Columnizer\Columnizer($this->mockData))->columnizeRowArray();
$tableman = new \mechanicious\Tableman\Tableman($columnBag);
$deleted = array_pop($this->mockData);
// Note: $tableman get's prefilled with null, we deleted 2 entry from the testee.
$this->assertEquals($tableman->diff($this->mockData), array(array('hobby' => null), $deleted));
}