public function testGetCountryCodeForRegion()
{
$this->assertEquals(1, $this->phoneUtil->getCountryCodeForRegion(RegionCode::US));
$this->assertEquals(64, $this->phoneUtil->getCountryCodeForRegion(RegionCode::NZ));
$this->assertEquals(0, $this->phoneUtil->getCountryCodeForRegion(null));
$this->assertEquals(0, $this->phoneUtil->getCountryCodeForRegion(RegionCode::ZZ));
$this->assertEquals(0, $this->phoneUtil->getCountryCodeForRegion(RegionCode::UN001));
// CS is already deprecated so the library doesn't support it
$this->assertEquals(0, $this->phoneUtil->getCountryCodeForRegion(RegionCode::CS));
}