Sometimes it is the interaction and interface between functions and classes that need refactored. It is of no benefit to add a unit test to an interface which does not isolate concerns, provide abstraction, or encapsulation only to then refactor that interface.
Sometimes it is the interaction and interface between functions and classes that need refactored. It is of no benefit to add a unit test to an interface which does not isolate concerns, provide abstraction, or encapsulation only to then refactor that interface.
Exactly.. if the code follows the SOLID principles, it's easier to write tests that won't break at the smallest code change.