public function testFormatNumberWithExtension()
{
$nzNumber = new PhoneNumber();
$nzNumber->mergeFrom(self::$nzNumber)->setExtension("1234");
// Uses default extension prefix:
$this->assertEquals("03-331 6005 ext. 1234", $this->phoneUtil->format($nzNumber, PhoneNumberFormat::NATIONAL));
// Uses RFC 3966 syntax.
$this->assertEquals("+64-3-331-6005;ext=1234", $this->phoneUtil->format($nzNumber, PhoneNumberFormat::RFC3966));
// Extension prefix overridden in the territory information for the US:
$usNumberWithExtension = new PhoneNumber();
$usNumberWithExtension->mergeFrom(self::$usNumber)->setExtension("4567");
$this->assertEquals("650 253 0000 extn. 4567", $this->phoneUtil->format($usNumberWithExtension, PhoneNumberFormat::NATIONAL));
}
