public function testUpdateSubdivision()
{
// No predefined subdivisions.
$this->assertEquals('RS-RS', UpdateHelper::updateSubdivision('RS-RS'));
// No dash.
$this->assertEquals('California', UpdateHelper::updateSubdivision('California'));
// Simple conversion.
$this->assertEquals('CA', UpdateHelper::updateSubdivision('US-CA'));
// Mapping.
$this->assertEquals('Hokkaido', UpdateHelper::updateSubdivision('JP-01'));
// Unknown.
$this->assertEquals('JP-CA', UpdateHelper::updateSubdivision('JP-CA'));
}