public function testAggregateSum() { // Get summed of all users `id` $user_sum = Model\User::sum(); // Consist $this->assertInstanceOf('Gas\\ORM', $user_sum); $this->assertInstanceOf('Gas\\Data', $user_sum->record); // The summed id would be (1+2+3+4) = 10 $this->assertEquals($user_sum->id, '10'); }