What is Test Driven Development? TDD vs. BDD vs. SDD

Test-driven development (TDD) is an iterative software practice in which developers write automated unit tests before implementing code, following a Red–Green–Refactor cycle of creating a failing test, writing the minimum code to pass it, and then improving the design. It aims to increase test coverage, reduce recurring defects, support safer refactoring, and provide rapid feedback, but can create maintenance burdens when tests are overly detailed, depend heavily on mocks, test implementation rather than behavior, or skip parts of the cycle. TDD can isolate individual classes or test collaborations among several objects, while Acceptance TDD focuses on system-level acceptance criteria and Developer TDD emphasizes developer-written unit tests. The discussion contrasts TDD’s technical focus on code correctness with BDD’s collaborative, user-behavior-oriented scenarios, and presents testRigor’s Specification-Driven Development (SDD) as an approach using plain-English executable specifications intended to connect business requirements, testing, and implementation. TDD may be less suitable for GUI-heavy work or projects with limited time, cost, or capacity to maintain a growing test suite, and common supporting frameworks include PyTest, JUnit, TestNG, and RSpec.

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