On: Ask HN: How do you familiarize yourself with a new codebase?

[brudgers]

Then you will learn that later when the test fails. That is better because the reason for writing the test was your belief that it was invariant. Without the test you are more likely to continue holding the mistaken belief.

[contentfairplay → brudgers]

Sure, but that is an incorrect test for other developers to worry about it failing.