test: improve test coverage

[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]

Not sure this should be awaited

[ognis1205]

Thanks for the comment!

Looking at the implementation here:

• a2a-python/src/a2a/grpc/a2a_pb2_grpc.py

  Line 25 in b94b8f5

  def __init__(self, channel):

it seems like channel might be a grpc.Channel.

However, based on how it’s being used in the current client implementation:

• https://github.com/a2aproject/a2a-python/blob/main/src/a2a/client/grpc_client.py

it looks like channel is intended to be a grpc.aio.Channel, in which case the SendStreamingMessage call should indeed be awaited.

That said, I’m not 100% certain either, so it’d be great to get confirmation from whoever originally implemented this part.

[holtskinner]

@pstephengoogle