Add tests

[abimaelmartell]

Summary

Adds comprehensive unit tests for CLI commands using Vitest. Tests verify that commands generate valid API calls and properly handle responses without making real API calls.

Changes

• Added Vitest testing framework with configuration for Node.js environment
• Created test utilities (src/__tests__/utils/mock-client.ts) for mocking the Firecrawl client
• Added tests for scrape command covering:
  • API call parameter generation (formats, options, filters)
  • Response handling (success and error cases)
  • Type safety validation
• Added tests for credit-usage command covering:
  • Fetch API call generation
  • Response parsing and error handling
  • Edge cases (null values, invalid JSON, etc.)

Key Features

✅ No real API calls - All tests mock the Firecrawl client or fetch API
✅ API call validation - Tests verify commands generate correct API parameters
✅ Response handling - Tests ensure proper handling of success and error responses
✅ Type safety - TypeScript ensures type correctness throughout

Testing

Run tests with:

Run tests once

pnpm test

Run tests in watch mode

pnpm test:watch

Run tests with UI

pnpm test:ui