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Fix: test_install_shim_affects_existing_tracers assumes wrong default tracer type #5047

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Fix: test_install_shim_affects_existing_tracers assumes wrong default tracer type #5047

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sakshar2303 Apr 6, 2026
487a6e2
Merge branch 'main' into main
MikeGoldsmith Apr 13, 2026
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8 changes: 5 additions & 3 deletions shim/opentelemetry-opencensus-shim/tests/test_patch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,15 +40,17 @@ def test_install_shim(self):
self.assertIsInstance(Tracer.tracer, property)

def test_install_shim_affects_existing_tracers(self):
# Initially the shim is not installed. A OC Tracer instance should have a NoopTracer
# Initially the shim is not installed. Store the original tracer instance.
oc_tracer = Tracer()
self.assertIsInstance(oc_tracer.tracer, NoopTracer)
self.assertNotIsInstance(oc_tracer.tracer, ShimTracer)
original_tracer = oc_tracer.tracer
self.assertNotIsInstance(original_tracer, ShimTracer)
Comment on lines +45 to +46
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@MikeGoldsmith MikeGoldsmith Apr 13, 2026

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Could we do this instead of creating a tracer instance?

Suggested change
original_tracer = oc_tracer.tracer
self.assertNotIsInstance(original_tracer, ShimTracer)
self.assertNotIsInstance(oc_tracer.tracer, ShimTracer)


install_shim()

# The property should cause existing instances to get the singleton ShimTracer
self.assertIsInstance(oc_tracer.tracer, ShimTracer)
# The ShimTracer wraps a NoopTracer, which should look like a NoopTracer
self.assertIsInstance(oc_tracer.tracer, NoopTracer)

def test_install_shim_affects_new_tracers(self):
install_shim()
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