Considering this Javascript file: [...] write a test using mocks for the following Javascript function: func(x, y)

Looking for a single custom prompts that can be used across many specific programming questions.

I think your example is more like how to write a prompt for a specific question

Like on stack overflow it helps to be specific of what you want, or to ask for possible ways to solve it first, or to give it a head start.

Like: in this func() can you make it so that ...