Add comprehensive tests and CI for A2UI Composer

[jacobsimionato]

Summary

This PR introduces a robust testing infrastructure and a dedicated CI workflow for the A2UI Composer tool. It also includes critical bug fixes for JSON parsing of AI-generated content.

Key Changes

• Testing Suite: Implemented unit and integration tests using Vitest and React Testing Library.
  • : Validates robust parsing of malformed or double-stringified JSON.
  • : Verifies interactions for persistent widget storage.
  • : Tests state management and widget lifecycle.
  • Component Tests: Coverage for , , and , including mocks for complex third-party libraries like Monaco Editor and CopilotKit.
• Bug Fixes: Enhanced to handle recursive parsing of JSON strings, ensuring reliability when receiving double-stringified data from LLMs.
• CI/CD Integration: Added to automate linting, building, and testing on every PR/push affecting .
• Documentation: Updated with instructions for running tests and configuring necessary environment variables.
• Maintenance: Updated with testing dependencies and scripts.

How to Test Locally

1. Navigate to the composer directory:

   cd tools/composer

2. Install dependencies:

   pnpm install

3. Run the test suite:

   pnpm test

[gemini-code-assist]

Code Review

This pull request is a significant improvement, introducing a comprehensive testing suite with Vitest and React Testing Library, which was much needed. The bug fix for robust JSON parsing is also a critical enhancement, especially for handling varied LLM outputs. The overall restructuring of the project by moving the composer into its own tools directory is a good organizational change. I have one minor suggestion to improve the maintainability of the JSON parsing logic.

[gemini-code-assist]

This logic for handling nested JSON is great. For better readability and to reuse the safe parsing utility you've already defined, you could simplify this try-catch block by using parseRobustJSONSafe. It achieves the same result (returning the string if the inner parse fails) but makes the intent more explicit.

        // Attempt to parse the nested JSON string. If it fails, return the string itself.
        return parseRobustJSONSafe(result, result);