Delegating writing unit tests

Some time ago I attended a meeting where a developer told us that

The development is done. Wrote som unit tests yesterday. They are not done. I delegated writing them to a colleague.

A statement like that makes me very sad. It also upsets me.

What is the size of a baby step?

It is easy to agree that baby steps are good when doing something complicated. They allow you to move slowly but steadily. That is why baby steps are recommended when doing software development.

If we agree that baby steps are good, the next question is "How large is a baby step?"

This is where it gets interesting and this is where I see different interpretations.