I'm currently working with a couple of students on an course project (2x8h per week).
At the last sprint planning we have taken one main backlog story to implement, and I was expected to be the primary implementer of it, besides a helping hand.
Now on day one I had to do a couple of backend tasks (for which I'm currently responsible for) and my helping hand, let's call him Jerry goes exploring the technology. Once I came back to the actual task Jerry found a good library to help the implementation and tried it out already, and I agreed on the library.
But when I tried to collaborate on how to implement the feature, Jerry informed me that he wishes to implement the feature by himself, to which I agreed since I wanted to give him the chance to prove himself (not much code is written by him yet). Later he asked me to write tests for the feature, which I did, but he does not use them and he does not write any tests himself (aside I had difficulty writing tests since I am not supposed to change anything in his code).
Problem is 1) I don't believe he can do it in time (we got a 5 days sprint, two days left). 2) I fear this will reflect badly on me since I was intended to write the feature. Should I say he took over the feature in the next daily?