test: update A2AClientTest with sending FilePart and DataPart

[tomsun28]

Description

for issue task #20

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• Make your Pull Request title in the https://www.conventionalcommits.org/ specification.
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    • fix: which represents bug fixes, and correlates to a SemVer patch.
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• Ensure the tests pass
• Appropriate READMEs were updated (if necessary)

Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @tomsun28, 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 introduces comprehensive unit tests for the A2AClient's sendMessage method, specifically covering scenarios where messages include FilePart and DataPart components. These additions ensure the client correctly handles various message types, improving robustness and verifying expected behavior for rich content.

Highlights

• New Test Cases for sendMessage: I've added three new test methods (testA2AClientSendMessageWithFilePart, testA2AClientSendMessageWithDataPart, testA2AClientSendMessageWithMixedParts) to A2AClientTest.java to validate the sendMessage functionality when dealing with FilePart and DataPart message components.
• FilePart Testing: I've included a test case for sending messages with a FilePart, demonstrating usage with FileWithUri and FileWithBytes (in the mixed parts test).
• DataPart Testing: I've added a dedicated test case for sending messages that contain a DataPart, ensuring proper serialization and handling of arbitrary structured data.
• Mixed Content Testing: I've introduced a test to verify the sendMessage method's behavior when a message contains both FilePart and DataPart alongside TextPart.
• Mock JSON Definitions: I've defined new static JSON string constants in JsonMessages.java to serve as mock request and response bodies for the newly added A2AClient tests, facilitating isolated testing.

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[gemini-code-assist]

Code Review

The pull request effectively introduces new test cases for sending messages with FilePart and DataPart, as well as a combination of both. The new test methods in A2AClientTest.java are well-structured and correctly utilize the mock server to simulate API interactions. The corresponding JSON message constants in JsonMessages.java accurately reflect the expected request and response payloads for these new message part types. The changes are consistent with existing code patterns and enhance the test coverage for the A2A client library. No issues of critical, high, or medium severity were identified.