Google\Cloud\Tests\Snippets\PubSub\SubscriptionTest::testPull PHP Method

    public function testPull()
    {
        $snippet = $this->snippetFromMethod(Subscription::class, 'pull');
        $snippet->addLocal('subscription', $this->subscription);
        $this->connection->pull(Argument::any())->shouldBeCalled()->willReturn(['receivedMessages' => [['message' => ['data' => 'hello world']]]]);
        $this->subscription->setConnection($this->connection->reveal());
        $res = $snippet->invoke('messages');
        $this->assertInstanceOf(\Generator::class, $res->returnVal());
        $this->assertEquals('hello world', $res->output());
    }