Is it OK to copy & paste unit-tests when the logic is basically the same?

Question

I currently have like 10 tests that test whenever my Tetris piece doesn\'t move left if there is a piece in the path, or a wall. Now, I will have to test the same behaviour for

Answer 1

There's nothing wrong with copy-pasting, and it's a good place to start. Indeed, it's better than from scratch, as if you've got working code (whether tests or otherwise), then copy-paste is more reliable than from scratch, as well as quicker.

However, that's only step 1. Step 2 is refactoring for commonality, and step 1 is only to help you see that commonality. If you can already see it clearly without copying (sometimes it's easier to copy first and then examine, sometimes it isn't, and it depends on the person doing it) then skip step 1.