What jumps out to me is that this is a success story of using a non-trivial test to illuminate an important but hard to observe bit of algorithm. I appreciate t

What jumps out to me is that this is a success story of using a non-trivial test to illuminate an important but hard to observe bit of algorithm. I appreciate the engineering grit to put in a complex test like this, and follow it up when the graph does not have the expected shape. Imagine your team does not want to write a test because it's too much work or hard to model - this is a great example to bring up.