Add new tests for VCell DB and LLMs services, enhance VCell DB connectivity, and update GitHub workflow

[KacemMathlouthi]

Summary:

This PR mainly addresses the issue #8 by implementing these changes:

• Removed obsolete test files that no longer worked due to major architecture changes
• Added unit tests for VCell DB service functions
• Enhanced VCell DB service with connectivity check and retry logic for VCML file fetching
• Added unit tests for LLMs service functions (response generation and analysis)
• Updated GitHub workflow to run the new tests
• Action required: @Ezequiel-Valencia please add the following secret keys in GitHub secrets so these tests can run:

  echo "AZURE_API_VERSION=${{ secrets.AZURE_API_VERSION }}" >> backend/app/.env
  echo "AZURE_ENDPOINT=${{ secrets.AZURE_ENDPOINT }}" >> backend/app/.env
  echo "AZURE_API_KEY=${{ secrets.AZURE_API_KEY }}" >> backend/app/.env
  echo "AZURE_DEPLOYMENT_NAME=${{ secrets.AZURE_DEPLOYMENT_NAME }}" >> backend/app/.env

[Copilot]

Pull Request Overview

This PR introduces unit test infrastructure and initial test coverage for the backend services. The main purpose is to establish a testing framework using pytest and pytest-asyncio, along with creating comprehensive unit tests for the VCell database service and LLM service functionalities.

• Adds pytest and pytest-asyncio dependencies for testing framework
• Creates new unit test files for core services (vcelldb_service and llms_service)
• Removes old API integration test files and replaces with focused unit tests
• Enhances error handling and logging in vcelldb_service with connectivity checks and retry logic

Reviewed Changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
backend/pyproject.toml	Adds pytest testing dependencies
backend/app/utils/tools_utils.py	Reformats import statements for better readability
backend/app/tests/vcelldb_api_tests.py	Removes old integration tests
backend/app/tests/tool_calling_tests.py	Removes old integration tests
backend/app/tests/test_vcelldb_service.py	Adds comprehensive unit tests for VCell DB service functions
backend/app/tests/test_llms_service.py	Adds unit tests for LLM service functions
backend/app/services/vcelldb_service.py	Enhances error handling with connectivity checks and retry logic
backend/app/services/llms_service.py	Improves logging in VCML analysis function
backend/app/services/knowledge_base_service.py	Minor formatting improvements
backend/app/schemas/tool_schema.py	Adds blank lines for better code structure
backend/app/routes/llms_router.py	Reformats function call for better readability
backend/app/main.py	Reformats import statements and adds blank lines

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