Some domains, such as data structures, math, stats, string processing, cryptography, etc have many well-defined problems. But whenever one writes code to either replicate (for study) or improve upon existing algorithms, each developer has to write their own test cases, reinventing and duplicating test suites for similar problems over and over and over.

In contrast, a standardized test bank can save massive amounts of each developers time and contribute to improved software quality across the board. It should be easy to write an utility that reads simple text files hosted online containing input/output test cases to exercise the code.

Project Wycheproof for testing crypto code (https://github.com/google/wycheproof) comes close to what I'm talking about, but I know of no similar projects for other domains. In any case, what I seek is even simpler: an indexed repository of CSV data files mapping input to output

As a start, how about we start an open Github project to collect together and unlock standard test cases that HN developers have buried in their projects?