Eventually Inconsistent

For a very long time I was told that tests should not influence the production code. By this I mean, that we should not change our design only in order to be able to test it. That was quite OK for me, since - you know - test are only tests - the production code is what matters and what drives the design. Tests should just shut up and follow. Right? Lastly I am flipping the bit and diving into TDD and I must say - this is quite an adventure. At the beginning I was like a babe in the woods. It was not easy to start. Everything was harder - writing code, designing, thinking... I had to firstly write a test, and then the code - everything was upside down - I didn't even have the code to test. Damn! I started to think about basics again, and that... was really refreshing! The Example One day I was given a task to figure out changes in history lines of some objects and update the meta-data for each line accordingly - with ids of objects that were changed. For the simp