I didn't make the claim that a code-based test can be invented that will substitute for looking at the data in the raw, plotting it, and verification using your

I didn't make the claim that a code-based test can be invented that will substitute for looking at the data in the raw, plotting it, and verification using your full mental capacities. However, "the only way to make sure it's right is to ... go through it line by line" is a bold claim. There are multiple named functions and some unnamed functions in this example that could be verified for programmer mistakes (such as typing 1000 vs 10000) and edge case handling (edge cases that often arise from messy ingested data). But even if they were tested, I'll concede that mistakes can still be made.