“Everything is a test,” says Terry Pratchett in "I Shall Wear Midnight".
Test - a way to establish if something is acceptable or not - is one of the world's most commonly performed procedures. Billions of years ago, Mother Nature established agile processes to test molecules, cells and organisms while creating them. Stone age toolmakers were checking if their tool was doing what it was supposed to do before using. Ancient humans assessed others for civil service and education. How did all those tests evolved with time?
