Unit Test Case Generator

Identify edge cases and generate structural unit test scenarios from your code. No AI, no cloud—pure deterministic logic for your local machine.

Source Function

Paste a function or code block to analyze logic and arguments.

Test Scenarios

Input a function to generate local test cases...

What is the Unit Test Case Generator?

The Unit Test Case Generator is a client-side testing utility developed to generate test scenarios for your functions. By analyzing logic structures locally, the generator produces edge case check lists, happy path parameters, and null inputs logs to help you build reliable software modules.

This generator runs all code parsers, conditional examinations, and test case suggestions locally in your browser memory. Since no code blocks, functions, or variable maps are sent over the network, your application logic and business configurations remain completely secure.

How to Use the Unit Test Case Generator

  1. Input Your Logic: Paste your function code block into the "Code Input" textarea editor.
  2. Generate Scenarios: Click the "Generate Test Scenarios" button to execute the local analysis engine.
  3. Review the Scenarios List: Inspect the "Test Scenarios" panel to review suggested edge cases (such as empty string handling, null values, or large integers).
  4. Export Your Checklist: Click the "Copy All" button to copy the generated scenarios to your clipboard for use as a checklist inside your unit tests.

Key Features

  • Interactive Logic Analysis: Scans code structures to identify function signatures, loops, and condition branches automatically.
  • Automated Edge Case Mapping: Flags potential vulnerabilities (like null arguments, empty arrays, or negative values) that often cause runtime failures.
  • Framework-Agnostic Output: Generates universal logic checklists compatible with Jest, Mocha, Pytest, JUnit, and other popular testing libraries.
  • One-Click Clipboard Copying: Copy generated scenarios instantly to keep your development workflow moving fast.
  • 100% Offline Runtime: Runs the parser engine entirely in the browser tab to keep your code private.

Common Use Cases

  • Form Validation Testing: Plan test scripts for input form checkers to verify handling of special characters, missing inputs, and long strings.
  • Utility Library Verification: Check utility functions (like math calculation engines or date formatters) for safety against extreme edge values.
  • Pre-Merge Quality Assurance: Quickly run an audit on newly written functions to verify logic coverage before committing code.
  • Test-Driven Development (TDD): Design a test checklist based on function signatures before writing the implementation logic.

Frequently Asked Questions

No. 99tool.in runs all code parsers, structural scans, and scenario mapping locally in your browser. None of your source code is sent over the network.

The parser is optimized for JavaScript, TypeScript, and Python syntax. However, since the generated test logic is framework-agnostic, you can use the suggestions for any programming language.

No. The generator uses deterministic rule-based analysis to map edge cases. This avoids the risk of code leaks associated with cloud-connected AI models.

Copy the list of scenarios and paste them into your testing library (like Jest or JUnit) as comments. Use them as a checklist to write test assertions for each scenario.

🔒 Privacy & Data Note: Code analysis, test case mapping, and clipboard copies are executed locally in your browser. None of your code is uploaded.