Fearless girl by clement127 CC-BY-NC-ND-2.0

Spreadshe

et testing

Fearless girl by clement127 CC-BY-NC-ND-2.0

Spreadshe

et testing

Validating

user input

A lot more validation is

possible here!

33% has a manual

Aircraft NATOPS Manual cover by E2a2j Public domain

33% has a manual

Aircraft NATOPS Manual cover by E2a2j Public domain

Tests can serve

as

documentation

This test explains

we expect a code

from an existing

category