When to test multiple cases?

Does anyone know where I can find the video that discusses when to test multiple cases in quantitative comparison questions?

That I believe comes to you with practice? As a rule of thumb though, I make it a point to test out multiple cases when I’m using numerical methods to solve a problem. The cases cover:

  1. Positive numbers
  2. Negative numbers
  3. Numbers between 0 and 1
  4. Numbers between -1 and 0.

Hope this helps you.