public function testExists()
{
$this->connection->getSubscription(Argument::withEntry('foo', 'bar'))->willReturn(['subscription' => 'projects/project-id/subscriptions/subscription-name', 'topic' => 'projects/project-id/topics/topic-name'])->shouldBeCalledTimes(1);
$this->subscription->setConnection($this->connection->reveal());
$this->assertTrue($this->subscription->exists(['foo' => 'bar']));
}