Feel free to ping it to me. Pretty straight forward stuff so I can’t see how you can be that far off the right lines. Just means you write the tests without knowing the inner workings of the app.
e.g. given a particular input, what output are you expecting.
Definition by ISTQB
Black box testing: Testing, either functional or non-functional, without reference to the
internal structure of the component or system.
Black box test design technique: Procedure to derive and/or select test cases based on an
analysis of the specification, either functional or non-functional, of a component or system
without reference to its internal structure.