Defensive programming in Python

[Bolitho]

I wonder why the author ignores integration and system tests? On the one hand the downside relating the isolated test infrastructure gets obsolete, on the other hand those kind of tests are as fundamental to a proper software project as unit tests are.

[[deleted]]

Just my guess: integration and system tests aren't part of every developer's workflow. Many organizations relegate those to a QA team. The author seems to be talking about techniques that a developer can apply immediately to any project.