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Write effective unit tests with TDD approach. TDD cycle: 1. Red (write failing test). 2. Green (write minimal code to pass). 3. Refactor (improve code while keeping tests green). Best practices: Test one thing per test. Use AAA pattern (Arrange, Act, Assert). Descriptive test names (should_returnTrue_when_inputIsValid). Mock external dependencies. Aim for 80%+ code coverage. Fast tests (<1 sec). Independent tests (no order dependency). Use test fixtures for setup. Frameworks: Jest, Pytest, JUnit. Benefits: confidence in changes, living documentation, better design.
A proven free prompt for Unit testing best practices TDD is: "Write effective unit tests with TDD approach. TDD cycle: 1. Red (write failing test). 2. Green (write minimal code to pass). 3. Refactor (improve code while keeping tests green). Best practices: Test ..." — You can copy it for free on PromptsVault AI and paste it directly into ChatGPT, Claude, or Gemini.
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Yes — this CODING AI prompt is 100% free on PromptsVault AI. No sign-up or payment required. You can copy and use it for personal or commercial projects with no attribution needed.
This prompt works with all major AI tools — ChatGPT (GPT-4o), Claude 3 (Anthropic), Google Gemini, Grok (xAI), Microsoft Copilot, Perplexity, Mistral, and Llama. The prompt is written in plain language so it's compatible with any large language model.