Google\Cloud\Tests\System\Datastore\RunQueryTest::testQueryWithKeysOnly PHP Method

    public function testQueryWithKeysOnly()
    {
        $query = self::$client->query()->kind(self::$kind)->keysOnly();
        $results = $this->runQueryAndSortResults($query);
        $this->assertEquals(4, count($results));
        foreach ($results as $result) {
            $this->assertEmpty($result->get());
        }
    }