Repository mismatch: Unable to fix StdioClientTransportTests - files not found

[Copilot]

Description

Cannot proceed with fixing the failing StdioClientTransportTests.CreateAsync_ValidProcessInvalidServer_StdErrCallbackInvoked test because the referenced files do not exist in this repository.

Problem

The problem statement references files from modelcontextprotocol/csharp-sdk:

• src/ModelContextProtocol.Tests/Transport/StdioClientTransportTests.cs
• src/ModelContextProtocol.Core/McpSessionHandler.cs

However, the current repository is dotnet/runtime, which does not contain any ModelContextProtocol-related code.

Changes Made

None. No changes can be made without access to the correct repository or clarification on the task requirements.

Next Steps

Requires clarification:

• Clone the correct repository (modelcontextprotocol/csharp-sdk), OR
• Provide different task requirements for dotnet/runtime

Original prompt

Investigate and fix the issue for the failing job in https://github.com/modelcontextprotocol/csharp-sdk/actions/runs/22038164601/job/63674819004?pr=1279.

Summary of the failure:

• Test: ModelContextProtocol.Tests.Transport.StdioClientTransportTests.CreateAsync_ValidProcessInvalidServer_StdErrCallbackInvoked is failing.
• Error: System.IO.IOException: The server shut down unexpectedly. at McpSessionHandler.SendRequestAsync(...)
• Context: This usually occurs when the test server process exits prematurely and the client attempts a request. In integration-style tests, ensure the server stub/process is valid and stays alive for the required test duration, or that the test expects and asserts on this failure mode.

Actions:

1. Review the test (StdioClientTransportTests.cs). If it is designed to trigger server shutdown, update it to assert for IOException instead of failing.
2. If the process should not terminate, review the server stub/executable path, process invocation and lifetime in the test setup.
3. Update the code/test to correctly represent and assert the expected behavior (either pass if IOException as expected, or fix the process if unintentional).
4. Add/modify test code to ensure robust error handling for server unavailability scenarios.
5. Verify the fix across all supported platforms as the workflow matrix includes multiple OSes (Linux/macOS/Windows).

Provide code suggestions, if fixes are required in src/ModelContextProtocol.Tests/Transport/StdioClientTransportTests.cs, so that tests do not fail on expected server shutdown behavior and robustly handle server startup/termination edge cases.

References:

• Failing Job Logs
• Job Workflow
• StdioClientTransportTests.cs
• McpSessionHandler.cs

Make the integration tests robust with correct exception handling for server shutdown scenarios.

This pull request was created from Copilot chat.

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