More nitpicky feedback: assertEquals(oneMeter, tenCentimeters); Of course the code is not wrong per se, it will simply throw an exception, but it still mad

More nitpicky feedback: assertEquals(oneMeter, tenCentimeters); Of course the code is not wrong per se, it will simply throw an exception, but it still made me frown. I wonder if you really meant to write this. Anyhow, this is a great article! I value the clear wording.