# fix(test): Refactor flaky StdioClientTransport tests to use real stdin
pipes
- Replace mock-based stdin with real input/output pipes for better
parity with actual usage.
- Ensure proper cleanup of resources (stdin and stdout pipes).
- Improve test stability by migrating from `runTest` to `runBlocking`
for real-time I/O operations.
## Motivation and Context
StdioClientTransportTest is flaky.
## How Has This Been Tested?
Unit test
## Breaking Changes
No
## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
## Checklist
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed
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