public function testAverage()
{
$user = new User();
$user->Wage = 100;
$user->Active = true;
$user->save();
$user = new User();
$user->Wage = 200;
$user->Active = true;
$user->save();
$user = new User();
$user->Wage = 600;
$user->Active = true;
$user->save();
$collection = User::find();
list($average) = $collection->calculateAggregates([new Average("Wage")]);
$this->assertEquals(300, $average);
}
