third_party/protobuf/php/tests/well_known_test.php

<?php

use Google\Protobuf\GPBEmpty;

class WellKnownTest extends PHPUnit_Framework_TestCase {

    public function testNone()
    {
        $msg = new GPBEmpty();
    }

    public function testImportDescriptorProto()
    {
        $msg = new TestImportDescriptorProto();
    }

}