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Tests fail when using Python 3.14 #581
Description
While working on .NET 11 support for the OpenTelemetry .NET SDK, which uses this test suite as part of its CI validation, I found that the tests don't work on Python 3.14, which is included in the .NET 11 SDK container images.
You can see such a failure here from #580:
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ERROR: setUpModule (test)
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Traceback (most recent call last):
File "/home/runner/work/trace-context/trace-context/test/test.py", line 34, in setUpModule
server = server or TestServer(host = '127.0.0.1', port = 7777, timeout = 3)
~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/runner/work/trace-context/trace-context/test/server.py", line 78, in __init__
self.loop = asyncio.get_event_loop()
~~~~~~~~~~~~~~~~~~~~~~^^
File "/opt/hostedtoolcache/Python/3.14.3/x64/lib/python3.14/asyncio/events.py", line 715, in get_event_loop
raise RuntimeError('There is no current event loop in thread %r.'
% threading.current_thread().name)
RuntimeError: There is no current event loop in thread 'MainThread'.
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Ran 33 tests in 0.057s
I have a patch for this locally that seems to work, so I'll look to push up a fix.
Activity
Disable Python 3.14
SergeyKanzhelev commentedon Mar 16, 2026
yes please. Thank you!
martincostello commentedon Mar 16, 2026
#582
Test multiple Python versions (#580)
Merge branch 'main' into w3cgh-581
Fix tests for Python 3.14 (#582)