How to test AWS S3 get object method ?

I am using aws sdk for ruby to retrieve an object from a bucket then read it. My code is something like:

def import_from_s3 

  #initiate the client
  s3 = Aws::S3::Client.new({
      region:            region,
      access_key_id:     key_id,
      secret_access_key: secret
  })

  #Get the object
  resp = s3.get_object(bucket: bucket, key: key)
end

My question is how do I test this method without mocking it?