test(api): add functions endpoint tests

[koxudaxi]

TL;DR

Added comprehensive test suite for the Functions API and database services.

What changed?

• Added functions.test.ts in the cloud/api directory to test the Functions API endpoints:

  • Testing registration of new functions
  • Retrieving functions by ID and hash
  • Listing functions with filtering capabilities
  • Proper API key authentication and validation

• Added functions.test.ts in the cloud/db/services directory to test the database services:

  • Testing environment context retrieval
  • Function registration and versioning logic
  • Function retrieval by ID and hash
  • Function listing with pagination and filtering

How to test?

1. Run the test suite with:

   npm test cloud/api/functions.test.ts
   npm test cloud/db/services/functions.test.ts
   

2. Verify that all tests pass, including:

   • API authentication tests
   • Function registration tests
   • Function retrieval tests
   • Function listing and filtering tests

Why make this change?

These tests ensure the reliability and correctness of the Functions API and database services. They validate key functionality like:

• Proper function versioning (major/minor version bumps based on signature changes)
• Correct handling of function metadata, tags, and descriptions
• API authentication and authorization
• Proper error handling for non-existent resources
• Filtering and pagination for function listings

This test coverage helps prevent regressions and ensures the Functions API behaves as expected.