im a fan of built in tests/traps, like assertions that makes bugs "explode": file x, line 22 did not expect state x to be y. Call Allen. When discovered, make a

im a fan of built in tests/traps, like assertions that makes bugs "explode": file x, line 22 did not expect state x to be y. Call Allen. When discovered, make a test that repeats the steps that lead up to the error.