[g___]

Hammock driven development https://www.youtube.com/watch?v=f84n5oFoZBc

[etiam]

Thank you! You're quite right that seems to match my description the best.

Unfortunately I seem to have amalgamated two different presentations in my memory then, so I'm still missing one. Similar ones that were good?

[g___]

This is the only one I remember that matches your description. I also liked "Simple made easy" by the same presenter but it's a completely different topic.