If a library changes its output unexpectedly, then either: - It’s a local library so the tests covering your code should fail - It’s changed in a way you didn

If a library changes its output unexpectedly, then either: - It’s a local library so the tests covering your code should fail - It’s changed in a way you didn’t anticipate so why would testing it directly fail when your prior test didn’t? - Your end user monitoring should light up like a Christmas tree