The issue wasn't units. It was a break in (programming) "contract". Catching such bugs could introduce further (logic related string parsing) bugs. A much more

The issue wasn't units. It was a break in (programming) "contract". Catching such bugs could introduce further (logic related string parsing) bugs. A much more robust method (especially considering that this table was prepared in advance) would have been to have someone else to independently duplicate the work and compare results.