public function testGetExampleNumber()
 {
     $this->assertEquals(self::$deNumber, $this->phoneUtil->getExampleNumber(RegionCode::DE));
     $this->assertEquals(self::$deNumber, $this->phoneUtil->getExampleNumberForType(RegionCode::DE, PhoneNumberType::FIXED_LINE));
     $this->assertEquals(null, $this->phoneUtil->getExampleNumberForType(RegionCode::DE, PhoneNumberType::MOBILE));
     // For the US, the example number is placed under general description, and hence should be used
     // for both fixed line and mobile, so neither of these should return null.
     $this->assertNotNull($this->phoneUtil->getExampleNumberForType(RegionCode::US, PhoneNumberType::FIXED_LINE));
     $this->assertNotNull($this->phoneUtil->getExampleNumberForType(RegionCode::US, PhoneNumberType::MOBILE));
     // CS is an invalid region, so we have no data for it.
     $this->assertNull($this->phoneUtil->getExampleNumberForType(RegionCode::CS, PhoneNumberType::MOBILE));
     // RegionCode 001 is reserved for supporting non-geographical country calling code. We don't
     // support getting an example number for it with this method.
     $this->assertEquals(null, $this->phoneUtil->getExampleNumber(RegionCode::UN001));
 }