Laravel API testing unit vs feature

I am using Laravel 5.6 to write a API with no views, just endpoints.

I am very new to testing and my understanding is that Unit tests are from a programmers perspective and Feature tests are from a users perspective.

As i am only creating an API, would I be right to assume that i will only be writing Unit tests? and i am safe to remove the tests/Feature directory all together?

My tests will consist of things like

public function it_authenticate_a_user()

Sorry if its a dull question, i am only trying to learn.

Thanks