Not quite, but I get what you're saying for sure. I think jacquesm said it well in his reply to me that you're more testing the "contracts between two pieces of

Not quite, but I get what you're saying for sure. I think jacquesm said it well in his reply to me that you're more testing the "contracts between two pieces of code right at the interface", and it shouldn't be any deeper than that to avoid what you're describing. The symptom of many tests failing during refactoring is something I'll be keeping in mind, however.