Generate test cases from a function signature. Produces happy path, edge cases, error cases, and boundary value tests as Jest/Vitest test code.

Generate realistic mock data: names, emails, addresses, dates, UUIDs, phone numbers, company names, credit cards (fake), IP addresses. Configurable count and locale.

Generate mock API responses from a schema. Creates realistic JSON responses for REST endpoints based on field names and types.

Parse source code and test code to identify untested functions. Suggests which functions need tests most based on complexity, export status, and parameter count.

Given expected and actual values (as JSON strings), generate detailed assertion code with descriptive messages. Supports deep object comparison, array comparison, and type checking.