this post was submitted on 13 Aug 2023
42 points (100.0% liked)

Programming

17538 readers
71 users here now

Welcome to the main community in programming.dev! Feel free to post anything relating to programming here!

Cross posting is strongly encouraged in the instance. If you feel your post or another person's post makes sense in another community cross post into it.

Hope you enjoy the instance!

Rules

Rules

  • Follow the programming.dev instance rules
  • Keep content related to programming in some way
  • If you're posting long videos try to add in some form of tldr for those who don't want to watch videos

Wormhole

Follow the wormhole through a path of communities [email protected]

founded 2 years ago
MODERATORS
snowe
Ategon
[email protected]
42
What does it really mean to test an interface not the implementation? (lemm.ee)
submitted 1 year ago by [email protected] to c/programming
12 comments fedilink hide all child comments
 

let's say there is a Shape interface.

interface IShape { double Area(); }

A Rectangle class and a Triangle class implement it. Now should i write tests for:

  1. IShape interface and test both implementations in a single test file?
  2. Write tests for Rectangle and Triangle class separately, testing their implementation of Area() ?
  3. Do something else?

From what I see I am testing implementations either ways. How do you even test an interface without testing the implementation? Can someone please help clarify my doubts? Thanks!

you are viewing a single comment's thread
view the rest of the comments
[–] [email protected] 1 points 1 year ago

Not an "expert" in testing per se, but I'm not sure I would ever attempt to "test" an interface. As you said, there is no implementation. You can only test implementation, so #2 in your list.