public function testDeleteByInstance()
{
$dao = new OwnerInstanceMySQLDAO();
$builder1 = FixtureBuilder::build(self::TEST_TABLE_OI, array('instance_id' => 20, 'owner_id' => 50));
$builder2 = FixtureBuilder::build(self::TEST_TABLE_OI, array('instance_id' => 20, 'owner_id' => 51));
$builder3 = FixtureBuilder::build(self::TEST_TABLE_OI, array('instance_id' => 20, 'owner_id' => 52));
$owner_instance = $dao->get(50, 20);
$this->assertNotNull($owner_instance);
$owner_instance = $dao->get(51, 20);
$this->assertNotNull($owner_instance);
$owner_instance = $dao->get(52, 20);
$this->assertNotNull($owner_instance);
$result = $dao->deleteByInstance(20);
$this->assertEqual($result, 3);
$owner_instance = $dao->get(50, 20);
$this->assertNull($owner_instance);
$owner_instance = $dao->get(51, 20);
$this->assertNull($owner_instance);
$owner_instance = $dao->get(52, 20);
$this->assertNull($owner_instance);
}
