NEXT interview questions

Completed an online questionnaire then got an email saying I had been shortlisted. The next day, I received a call and was asked basic questions such as when I could start, what my skills were etc. This was a very informal conversation and lasted less than 10 minutes, at the end of which I was invited in store for an assessment. The in-store assessment consisted of me being on the shop floor and just organising sections. I was also asked to pick out an outfit for an occasion. This lasted around 30 minutes. When doing this, they're looking to see how you behave around customers, so be sure to greet any customers you see. In the end, I was offered an xmas temp job instead of the permanent role I applied for, so I declined it and found a job elsewhere (which pays higher than minimum wage!!) The interview process was informal and the staff were friendly, but I found the concept of making applicants work for free under the guise of an 'assessment' rather odd considering this was a part-time role and, again, only pays minimum wage.