test: Add input-required workflow coverage

[ehsavoie]

Add test for input-required task state transitions: create task, receive input-required status, send input, and complete task.

[gemini-code-assist]

Summary of Changes

Hello @ehsavoie, 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 significantly enhances the test suite by introducing comprehensive coverage for the INPUT_REQUIRED task state workflow. It ensures that the system correctly handles tasks that require user interaction, from the initial request to the final completion after input is provided, thereby improving the reliability and robustness of the task management system.

Highlights

• New Test Case for Input-Required Workflow: A new JUnit test, testInputRequiredWorkflow, has been added to AbstractA2AServerTest.java. This test validates the complete lifecycle of a task that transitions to an INPUT_REQUIRED state, receives subsequent user input, and then successfully completes.
• Agent Executor Simulation Logic: Specific logic has been implemented within AgentExecutorProducer.java to simulate the INPUT_REQUIRED state for tasks identified by a special prefix (input-required-test). This logic handles the initial request by setting the task to INPUT_REQUIRED and then transitions it to COMPLETED upon receiving the expected user input.
• Message Text Extraction Utility: A new private helper method, extractTextFromMessage, was introduced in AgentExecutorProducer.java to safely and efficiently extract text content from the parts of a Message object.

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[gemini-code-assist]

Code Review

This pull request adds a test case to verify the input-required task state transitions. The test creates a task, transitions it to INPUT_REQUIRED, sends input, and completes the task. The changes also include adding necessary imports and a helper method to extract text from messages in the AgentExecutorProducer class.