Wallapop Senior Java Backend Developer interview questions

I applied online, and got contacted by a recruiter. We had a 30minute interview where I talked about my experience and why I'm looking for a change, and they talked about the company and the projects going on. After that they sent me a home test which I had to complete over the weekend and took me about 10 hours. It took 2 weeks for them to review the code and come back to me informing I was not through. The feedback was mostly useful but I was surprised they complained about no integration tests, in simple API home assignment.