Test Code Generator

Generates Vitest test code from JSON specifications using boundary value analysis and equivalence partitioning.

An MCP server that generates Vitest test code based on boundary value analysis and equivalence partitioning from JSON specifications.

- Boundary Value Analysis: Automatically generates boundary values and their adjacent values for continuous ranges
- Multiple Range Support: Handles discontinuous valid ranges (e.g., 0-10, 20-30, 40-50)
- Equivalence Partitioning: Includes all valid and invalid values from categorical data
- Pairwise Testing: Generates efficient test combinations using pairwise method
- Vitest Format: Generates clean test code usingtest.eachpattern
- Specification Guide: Provides prompts to help create JSON specifications
- Language-Optimized: All processing and output in English for optimal LLM performance

# Run directly with npx npx testing-mcp-vitest # Configure Claude Desktop as shown below

SeeQUICKSTART.mdfor detailed setup instructions.

# Clone repository git clone <repository-url> cd test-code-generator-mcp # Install dependencies npm install # Build npm run build

{ "mcpServers": { "test-generator": { "command": "npx", "args": ["testing-mcp-vitest"] } } }

- macOS:~/Library/Application Support/Claude/claude_desktop_config.json
- Windows:%APPDATA%\Claude\claude_desktop_config.json

Generates test code from JSON specification.

- create-test-spec: Explains how to create test specifications
- boundary-value-example: Provides boundary value analysis examples
- equivalence-class-example: Provides equivalence partitioning examples

{ "type": "model", "name": "UserRegistration", "columns": [ { "name": "age", "type": "number", "valueType": "continues", "values": { "min": 18, "max": 120 } }, { "name": "userType", "type": "string", "valueType": "category", "values": { "valid": ["admin", "user", "guest"], "invalid": ["superuser", "root", ""] } } ] }

{ "name": "workHours", "type": "number", "valueType": "continues", "values": { "ranges": [ { "min": 9, "max": 12 }, // Morning shift { "min": 14, "max": 18 } // Afternoon shift ] } }

import { describe, test, expect } from 'vitest'; describe('Tests for UserRegistration', () => { // Valid cases test.each([ { inputs: { age: 18, userType: "admin" }, description: 'Combination 1: Valid case' }, { inputs: { age: 69, userType: "user" }, description: 'Combination 2: Valid case' }, { inputs: { age: 120, userType: "guest" }, description: 'Combination 3: Valid case' }, // ... more test cases ])('Valid case: $description', ({ inputs }) => { // TODO: Import the function or model to test // import { UserRegistration } from './path/to/UserRegistration'; // TODO: Execute the test subject // const result = UserRegistration(inputs); // TODO: Check expected values // expect(result).toBeDefined(); // expect(result.error).toBeUndefined(); }); // Invalid cases test.each([ { inputs: { age: 17, userType: "admin" }, description: 'Combination 4: Invalid case' }, { inputs: { age: 121, userType: "user" }, description: 'Combination 5: Invalid case' }, { inputs: { age: 50, userType: "superuser" }, description: 'Combination 6: Invalid case' }, { inputs: { age: 50, userType: "root" }, description: 'Combination 7: Invalid case' }, { inputs: { age: 50, userType: "" }, description: 'Combination 8: Invalid case' }, // ... more test cases ])('Invalid case: $description', ({ inputs }) => { // TODO: Import the function or model to test // import { UserRegistration } from './path/to/UserRegistration'; // TODO: Verify that an error occurs // expect(() => UserRegistration(inputs)).toThrow(); // or // const result = UserRegistration(inputs); // expect(result.error).toBeDefined(); }); });

- All valid and invalid equivalence class values are included in test cases
- Boundary values include: min-1, min, min+1, middle, max-1, max, max+1
- For multiple ranges, includes gap values between ranges

- 3 or fewer parameters: generates all combinations
- 4 or more parameters: uses pairwise method for efficiency

- Working hours (9-12, 14-18)
- Valid scores (0-40 passing, 60-100 honors)
- Temperature ranges (different valid ranges for different conditions)
- Time slots (morning, afternoon, evening sessions)

See theexamples/directory for more specification examples:

- user-registration.json- Basic model validation
- calculate-discount.json- Business logic with multiple parameters
- multi-range-validation.json- Complex scheduling with multiple ranges
- japanese-postal-code.json- Regional validation patterns

# Development mode npm run dev # Build npm run build # Production mode npm start # Debug mode DEBUG=1 npm start

- Fork the repository
- Create your feature branch (git checkout -b feature/amazing-feature)
- Commit your changes (git commit -m 'Add some amazing feature')
- Push to the branch (git push origin feature/amazing-feature)
- Open a Pull Request

- GitHub Issues: Report bugs or request features
- Discussions: Ask questions or share ideas

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