Practicing TDD with Katas: String Calculator, Bowling Game and Deliberate Repetition
A kata is practicing the TDD rhythm through deliberate repetition, solving a small problem with a known answer many times; success means step quality, not finishing. We cover coding dojo, randori and ping-pong formats, and solve String Calculator with C# and xUnit v3 Theory and Bowling Game with TypeScript and Vitest, following the test list, the critical decision points and variations that make a kata harder, with real output.
14 Nov 2026
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13 min
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4
