Google\Cloud\PubSub\Topic::exists PHP 메소드

    public function exists(array $options = [])
    {
        try {
            $this->info($options);
            return true;
        } catch (NotFoundException $e) {
            return false;
        }
    }

 public function testExistsReturnsFalse()
 {
     $this->connection->getTopic(Argument::withEntry('foo', 'bar'))->willThrow(new NotFoundException('uh oh'));
     $topic = new Topic($this->connection->reveal(), 'topic-name', 'project-name');
     $this->assertFalse($topic->exists(['foo' => 'bar']));
 }