My team is bringing on two new people - an intern and a full time. The intern has one semester to go, and the full time is fresh out of uni. After a two week training period, the plan management has for them is to have them write tests to learn the code base. (Which, if you follow my other questions you know we need tests desperately.)
But then it got me thinking... how can you write a test if you don't know what the code is supposed to actually do? I fear this would cause us to have fragile and non-thorough tests.
Regardless of how common it is, is it a good idea to have new developers write unit tests for a while to learn the code base?