Best Cursor Prompt for “Write Unit Tests”
Cursor works best with goal-oriented prompts that include @-references to specific files and directories. As an AI code editor, it needs clear scope boundaries — what to modify and what NOT to touch — along with direct action verbs like Add, Refactor, Fix, or Extract. This free template is optimized specifically for Cursor, achieving approximately 37% token reduction compared to unoptimized prompts while producing higher quality output.
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Optimized Cursor Prompt
Goal: Write comprehensive unit tests for the provided JavaScript function. The tests should cover various scenarios, including edge cases and typical use cases, to ensure the function's reliability and correctness. Context: - Read the function located in `@src/utils/formatDate.js`. - Use existing test patterns found in `@src/tests/utils/formatString.test.js` as a reference for test structure and assertion style. - Consider the expected input formats and output of the `formatDate` function as defined by its current implementation. Constraints: - Use the Jest testing framework. - Ensure all tests are written in TypeScript. - Mock any external dependencies or browser APIs if necessary. - Aim for at least 10 distinct test cases. - Do not modify the original `formatDate.js` file. - Follow the naming convention `formatDate.test.ts` for the new test file. Output: A new file named `formatDate.test.ts` placed in the `@src/tests/utils/` directory containing the unit tests for the `formatDate` function.
Why This Cursor Prompt for “Write Unit Tests” Works Better
When you type “Write unit tests for this function” into Cursor, it lacks structure — Cursor has to guess what format you want, how detailed to go, and what to prioritize. The optimized version removes that guesswork.
It adds @-references to specific files and directories, defines clear scope boundaries, and uses direct action verbs — giving Cursor the precise context it needs to make accurate code changes.
This Prompt Optimized for Other AI Models
Each AI model processes instructions differently. See how this same prompt is optimized for:
Frequently Asked Questions
What makes a good Cursor prompt for write unit tests?
Cursor works best with goal-oriented prompts that include @-references to specific files and directories. As an AI code editor, it needs clear scope boundaries — what to modify and what NOT to touch — along with direct action verbs like Add, Refactor, Fix, or Extract.
Can I use this prompt template for free?
Yes — copy the optimized prompt below and paste it directly into Cursor. For unlimited prompt optimization across all 5 AI models, try PromptOptimizr free with 10 prompts per month. You can also use the Chrome extension to optimize prompts directly inside your AI chat.
Why is this prompt different from a generic one?
Each AI model processes instructions differently. Cursor has specific formatting preferences — this prompt is structured to work with those preferences, not against them. The result is better output quality with approximately 37% fewer tokens.
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