Understanding the classical model for linking series by Raymond Chen

The algorithm:
https://devblogs.microsoft.com/oldnewthing/20130107-00/?p=5633

You can override an LIB with another LIB, and a LIB with an OBJ, but you can’t override an OBJ:
https://devblogs.microsoft.com/oldnewthing/20130109-00/?p=5613

Using the classical model for linking to provide unit test overrides:
https://devblogs.microsoft.com/oldnewthing/20250416-00/?p=111077