I still have to debug stupid errors, like calling a function with the right type signature but with the wrong effect I wonder if a way of writing tests which i

I still have to debug stupid errors, like calling a function with the right type signature but with the wrong effect I wonder if a way of writing tests which is significantly easier (taking one or two magnitudes less time) would help here? Say for example, something like Python's doctests which run inside your IDE... it seems my standard way of development anyway - to write a piece of code, test it in the REPL, repeat.