function testYearAsc()
 {
     $schemaGenerator = new VF_Schema_Generator();
     $schemaGenerator->setSorting('year', 'asc');
     $schema = new VF_Schema();
     $this->assertEquals('asc', $schema->getSorting('year'));
     $vehicle1 = $this->createMMY('Honda', 'Civic', '1999');
     $vehicle2 = $this->createMMY('Honda', 'Civic', '2000');
     $vehicle3 = $this->createMMY('Honda', 'Civic', '2001');
     $this->insertMappingMMY($vehicle1);
     $this->insertMappingMMY($vehicle2);
     $this->insertMappingMMY($vehicle3);
     $year = new VF_Level('year');
     $actual = $year->listInUse(array('model' => $vehicle1->getLevel('model')->getId()));
     $this->assertEquals("1999", $actual[0]->getTitle(), 'should return years, in ASC order');
     $this->assertEquals("2000", $actual[1]->getTitle(), 'should return years, in ASC order');
     $this->assertEquals("2001", $actual[2]->getTitle(), 'should return years, in ASC order');
 }