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

If you are repeating code, then you must refactor. Your situation is a common problem and is solved using 'Parameteric Testing'. Parameteric testing when supported by the test harness allows for passing multiple sets of input values as parameters. You may also want to look up Fuzz testing, I have found that it useful in situations such as this.