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> tests that are essentially testing implementation decisions. There shouldn't be any. Those are not useful at all.

• sago 11y ago
  See my reply above. I think your view is either naive, or you understand 'implementation decision' in too narrow a way.
  • atemerev 11y ago
    I understand "implementation decisions" in quite well-defined way; only functional invariants should be tested. Your example is a perfect illustration for one. Additional point is that invariant-based testing can easily be transformed into automated fuzzy tests using Quickcheck and its analogues, and this can find immense amount of otherwise hidden bugs.
    • sago 11y ago
      > only functional invariants should be tested. That makes no sense at all. > Your example is a perfect illustration I didn't give an example. > invariant-based testing can easily be transformed into automated fuzzy tests 'fuzz' not 'fuzzy'. True, but irrelevant to the point being argued.