I work as a developer in a scrum environment. For 2 sprints, my work has been rolled over due to a co-worker (the codebase's owner) not testing it quickly enough. The first sprint, I finished 3 days ahead of time and didn't get any feedback until the last day of the sprint, so it was rolled over to the next sprint. I fixed the issues 2 days into the next sprint and that code didn't begin being tested until 2 days before the next sprint. I was told he's testing it, but so far haven't received any feedback, so now my code is being rolled over to a new sprint again.
I feel like this reflects poorly on me to upper management. I want to "bug" this co-worker about testing my code, but I feel like doing that too much is rude. What are my options in this situation?