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TDD: Test Behaviors Through Public Interfaces

DevTernity Conference · Talk · YouTube title: 🚀 TDD, Where Did It All Go Wrong (Ian Cooper)
Why it's here

HN repeatedly calls it the best talk on testing, and many say it changed how they approach tests, mocks and the meaning of a unit.

What it covers

Ian Cooper's DevTernity talk revisits Kent Beck's original TDD ideas and shows where misunderstandings crept in. It argues tests should target behaviors through public interfaces rather than implementation details, so suites support refactoring instead of resisting it.