Google\Cloud\Tests\Snippets\PubSub\TopicTest::testSubscription PHP Method

    public function testSubscription()
    {
        $snippet = $this->snippetFromMethod(Topic::class, 'subscription');
        $snippet->addLocal('topic', $this->topic);
        $res = $snippet->invoke('subscription');
        $this->assertInstanceOf(Subscription::class, $res->returnVal());
    }