Google\Cloud\Tests\System\PubSub\ManageIAMPoliciesTest::testManageSubscriptionIAM PHP Method

    public function testManageSubscriptionIAM($client)
    {
        $topic = $client->createTopic(uniqid(self::TESTING_PREFIX));
        self::$deletionQueue[] = $topic;
        $sub = $client->subscribe(uniqid(self::TESTING_PREFIX), $topic->name());
        self::$deletionQueue[] = $sub;
        $this->assertIam($sub->iam());
    }