test: add coverage for error handlers, constants, optionals, and models

[ahoblitz]

…dels

Description

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Fixes NA

[gemini-code-assist]

Summary of Changes

Hello @ahoblitz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the test coverage for various modules within the a2a project. It introduces new test files to validate the functionality of optional dependencies, SQLAlchemy model integrations, application constants, and error handling mechanisms.

Highlights

• Optional Dependencies Testing: Added a new test file to ensure the Channel import in a2a.client.optionals behaves correctly when grpc is not available.
• SQLAlchemy Model Testing: Introduced comprehensive tests for PydanticType and PydanticListType decorators in a2a.server.models, verifying their ability to process Pydantic models and lists for SQLAlchemy. Also included tests for dynamic model creation functions like create_task_model and create_push_notification_config_model.
• Constants Validation: New tests were added for a2a.utils.constants to confirm the correctness of various application constants, including agent card paths and default RPC URLs.
• Error Handler Coverage: Implemented tests for rest_error_handler and rest_stream_error_handler in a2a.utils.error_handlers, ensuring proper error response formatting and exception handling for both REST and stream endpoints, and validating the A2AErrorToHttpStatus mapping.

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[gemini-code-assist]

Code Review

This pull request adds valuable test coverage for several key areas: error handlers, constants, optional dependencies, and SQLAlchemy models. The tests are generally well-written and cover important cases. I've made a few suggestions to improve the tests' robustness and adhere to Python's standard coding conventions, such as moving local imports to the top of the file and strengthening an assertion. I also pointed out an unused import that should be removed.