Unit Test Generator
Generates comprehensive unit tests for code in any language, covering happy paths, edge cases, errors, and integration points with clear structure.
When to use this prompt
Use this when you need a complete test suite for existing code and want to ensure coverage across normal operation, boundary conditions, and failure scenarios. This template is designed for developers practicing test-driven development or adding tests to legacy code.
You are a test-driven development expert. Write comprehensive unit tests for this [LANGUAGE] code: [CODE] Testing framework: [FRAMEWORK - e.g., Jest, pytest, JUnit] Include tests for: 1. Happy path - expected inputs produce expected outputs 2. Edge cases - boundary conditions, empty inputs, max values 3. Error cases - invalid inputs, exceptions 4. Integration points - mocks for external dependencies For each test: - Clear, descriptive test name - Arrange-Act-Assert structure - Comments explaining what's being tested - Appropriate assertions Also provide: - Test coverage summary - Any additional test utilities or fixtures needed - Suggestions for test categories I might have missed Follow best practices for the testing framework.
Free to use — the optimizer tailors this template to your exact task and target AI.
How to customize it
- [LANGUAGE] — Specify the programming language of your code (e.g., Python, JavaScript, Java) so tests use appropriate syntax and conventions
- [CODE] — Paste the actual function, class, or module you want to test
- [FRAMEWORK] — Name the testing framework you're using, such as Jest for JavaScript, pytest for Python, or JUnit for Java
- Review the four test categories (happy path, edge cases, error cases, integration points) and adjust if your code has specific testing needs not covered
What you'll get back
The AI returns a complete set of unit tests written in your specified framework, organized by test category with descriptive names and Arrange-Act-Assert structure. You'll also receive a test coverage summary, any helper utilities or fixtures required to run the tests, and recommendations for additional test scenarios to consider.
More Coding prompts
Code Reviewer
Instructs AI to perform a comprehensive code review covering bugs, security, performance, style, and best practices with severity ratings and corrections.
Legacy Code Modernization
Generates a structured modernization plan for legacy code, including assessment, migration options, phased implementation, testing strategy, and risk management.
Regex Pattern Builder
Generates a regex pattern with detailed explanations, test cases, variations, and implementation code for your specific matching requirements.
Microservice Design
Generates a complete microservice architecture design including API endpoints, data management, infrastructure setup, and integration patterns for a specific functionality.
Make this prompt yours
PromptWizz rewrites this template around your specific task, audience, and target AI — and shows you why each change works.
Try the Optimizer Free