test: improve test coverage for grpc_client.py

[ognis1205]

Description

Refactored tests/client/test_grpc_client.py and added test cases to improve coverage for grpc_client.py.

• Improved test coverage for src/a2a/client/grpc_client.py: 41% → 98%
• Fixed incorrect field checks on the response object in grpc_client::send_message
• Fixed missing await call at the correct location in grpc_client::send_message_streaming
• Defined valid taskId format ([a-zA-Z0-9_.-]+)

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Fixes N/A 🦕

[gemini-code-assist]

Summary of Changes

Hello @ognis1205, 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 primarily focuses on enhancing the reliability and testability of the gRPC client. It significantly boosts test coverage for the grpc_client.py module, ensuring more robust behavior. Alongside the expanded test suite, the PR includes crucial bug fixes related to correct protobuf field handling and proper asynchronous method invocation within the client.

Highlights

• Improved Test Coverage: The test coverage for src/a2a/client/grpc_client.py has been significantly increased from 41% to 90% by adding new test cases and refactoring existing ones.
• Bug Fix: Protobuf Field Check: Corrected an issue in grpc_client::send_message where the presence of a protobuf field (response.task) was incorrectly checked. The logic now uses response.HasField('task') for accurate detection.
• Bug Fix: Missing Await Call: Resolved a bug in grpc_client::send_message_streaming by adding a missing await keyword to the gRPC streaming call, ensuring proper asynchronous execution.
• Expanded Test Suite: New test cases have been added to cover the send_message method when it returns a Message object, and a comprehensive test for send_message_streaming has been introduced to validate its handling of various streamed event types (Message, Task, TaskStatusUpdateEvent, TaskArtifactUpdateEvent).
• Test Infrastructure Enhancements: The test suite in tests/client/test_grpc_client.py has been refactored to include new fixtures for sample data and corrected mock names, improving test robustness and maintainability.

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[gemini-code-assist]

Code Review

This pull request significantly improves test coverage for the gRPC client and fixes two important bugs: a missing await on a streaming call and an incorrect field check in the send_message method. The new tests and fixtures are well-structured.

I've identified a few minor issues related to type correctness in the new test fixtures where struct_pb2.Struct() is used instead of a dictionary for metadata fields. While this may work at runtime, using the correct types will improve code clarity and maintainability. Please see my detailed comments.

[holtskinner]

Can you make this work with the new refactoring in #348 ?

[ognis1205]

Sorry for the late reply.

Can you make this work with the new refactoring in #348 ?

You’re right, @holtskinner — I had noticed that the test code needed to be updated due to the recent refactoring, but I hadn’t gotten around to it yet. I’ll take a look at the changes and update the tests accordingly. Thanks for the reminder!

[ognis1205]

Can you make this work with the new refactoring in #348 ?

I have updated unit tests regarding the refactoring.

[ognis1205]

@holtskinner @pstephengoogle

Hi, just checking in on this PR — is it waiting on A2A#869?
No rush, just wanted to make sure it's still on the radar. Thanks!

[ognis1205]

We should update the tests to use UUIDs with the changes introduced in:

a2aproject/A2A#966

The use of UUIDs introduced in a2aproject/A2A#966 is only a recommendation, not a requirement.

[ognis1205]

@holtskinner @pstephengoogle

Since UUID usage is now only recommended (per a2aproject/A2A#966), this is no longer blocked.
Just checking in to see if you’re able to review the PR when you have a chance. Thanks!

[ognis1205]

Hi @holtskinner , @pstephengoogle
Just checking in — do you have any updates on the PR review, or do you think it might be better to close it?

[ognis1205]

Hi @holtskinner @pstephengoogle , this PR is already approved, is there anything else needed before merging?

[holtskinner]

/gemini review

[gemini-code-assist]

Code Review

This pull request significantly improves the test coverage for grpc_client.py, fixes a couple of bugs related to response handling and async calls, and refines the task ID validation regex. The changes are well-implemented and thoroughly tested. I've added a few minor suggestions to improve docstring grammar and enhance consistency in test data creation.

[ognis1205]

@holtskinner
Thanks!