public function testMessageWithSubscription()
{
$message = $this->stub->call(['message' => ['data' => base64_encode('hello world')], 'subscription' => 'projects/project-id/subscriptions/foo'], true);
$this->assertInstanceOf(Subscription::class, $message->subscription());
$this->assertEquals('projects/project-id/subscriptions/foo', $message->subscription()->name());
}