Enable parallel tests on Windows

[jlowin]

Now that the problematic stdio subprocess tests are skipped on Windows, perhaps we can re-enable parallel test execution. (#2714, #2711)

[marvin-context-protocol]

Test Failure Analysis

Summary: The integration test test_call_tool_list_commits failed with a timeout due to a 429 Too Many Requests error from GitHub Copilot's MCP API.

Root Cause: The test is hitting GitHub Copilot's remote MCP endpoint (https://api.githubcopilot.com/mcp/) which is returning a 429 rate limit error. The test times out after 30 seconds while waiting for a response that never completes due to the rate limiting. This is not related to the changes in PR #2715 (enabling parallel tests on Windows) - the Windows tests passed successfully with 3157 tests.

Suggested Solution:

1. Skip or mark as flaky: Add a retry mechanism or mark this test as flaky since it depends on an external service that may rate limit
2. Add exponential backoff: Implement retry logic with exponential backoff for the GitHub Copilot MCP integration tests
3. Mock the endpoint: Consider using a mocked version of the GitHub Copilot MCP API for tests to avoid external dependencies

The good news: PR #2715's main objective succeeded - parallel tests now work on Windows (3157 tests passed).

Detailed Analysis

From the logs:

ERROR   asyncio:base_events.py:1758 unhandled exception during asyncio.run() shutdown
task: <Task finished name='Task-6' coro=<TestGithubMCPRemote.test_call_tool_list_commits() done, defined at /home/runner/work/fastmcp/fastmcp/tests/integration_tests/test_github_mcp_remote.py:99> exception=HTTPStatusError("Client error '429 Too Many Requests' for url 'https://api.githubcopilot.com/mcp/'\nFor more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/429")>

The test timed out waiting for a response from the GitHub Copilot MCP API, which returned a 429 status code indicating rate limiting. The pytest timeout (30s) was exceeded while the async selector was blocked waiting for I/O.

Related Files

• tests/integration_tests/test_github_mcp_remote.py:99-124 - The failing test method that calls the GitHub Copilot MCP API
• .github/workflows/run-tests.yml - CI workflow that runs integration tests with --timeout=30 and --maxprocesses 2