Just from watching the first few minutes, I'm going to guess this is about the conversation that goes on when you're unit testing with at least one other person.
I'm hoping his message resonates with what I've been telling people: it's about the conversation you have, it's about the story we're trying to tell with the code and everybody getting on the same page about what that story is. It's about you and I telling the same story to each other and agreeing, then looking at the code and making sure the code tells the same story. It's about making sure that the code can communicate the same story to whoever (or is it whomever?) comes across this code and needs to know what that story is.
Edit #1: At the 20 minute mark, it's clear that his intent for the presentation is something different from what I was hoping. Still interesting points though and many of the quotes I have also used before around different kinds of discussion.
Edit #2: At the 55 minute mark, it's actually now started to run along the same lines that I initially thought it would. He makes a great point about the style of naming, that the names should make definite assertions.
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