For some classic wisdom about writing tests see the classic "Art of Software Testing" by Glenford Myers. It's $149+++ on Amazon, but only $5 on ebay: https://w

For some classic wisdom about writing tests see the classic "Art of Software Testing" by Glenford Myers. It's $149+++ on Amazon, but only $5 on ebay: https://www.ebay.com/sch/i.html?_from=R40&_trksid=p3671980.m570.l1313&_nkw=art+of+software+testing+myers&_sacat=0 https://www.ebay.com/sch/i.html?_from=R40&_trksid=p3671980.m... This was originally published before TDD was a thing, but is highly applicable.