While this was not the case - it is increasingly happening - and even when you are doing your PhD the authorship will be agreed upon. The more agreements are set up at the beginning of the process the better the outcome - and the more the friendship or relationship with the co-authors will continue.

Please see my challenge on the dominance of the ICMJE, and the ethics of so much power:

https://www.researchgate.net/post/Is_it_ethical_for_the_International_Committee_of_Medical_Journal_Editors_ICMJE_to_have_so_much_power