Intro to TDD and BDD
summary
Explains that TDD is the concrete red-green-refactor loop (write the next specification, make it pass quickly, then refactor without changing behavior) and argues the second D really promotes design by driving testable APIs. Describes BDD as three steps—collaborate, record, automate—using feature files with Gherkin or plain JUnit/SpecFlow for acceptance tests, recommends pushing tests down the technical pyramid until only interested non‑dev stakeholders can read them, and lists practical benefits: executable documentation, regression detection, and safer refactoring.
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