Test Deduplicator

Ten tests cover the same branch. Nine of them can go. But which nine? The one you keep is the one that covers something the others don't.

What makes two tests "the same"

Sameness level	Evidence	Deletion confidence
Textual clone	Near-identical code, one value different	Low — might test different boundaries
Same coverage	Per-test coverage sets are equal	Medium
Same coverage, subsumes	Test A's coverage ⊇ Test B's	High — B is redundant
Same mutants killed	Mutation testing: A and B kill identical mutant sets	High
Same assertions, same inputs	Literally the same test, different name	Very high — copy-paste accident

Coverage subsumption is the key signal. If test A covers everything test B covers and more, B adds nothing.