[flaky test][receiver/opencensus] TestExportSpanLinkingMaintainsParentLink panic: index out of range

[pjanotti]

Component(s)

receiver/opencensus

Describe the issue you're reporting

Looks like a race in the test, I couldn't repro it locally so likely it is low frequency. Detected at https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/13051122084/job/36411445776#step:8:360

It was preceeded by another, potentially related, test failure, see #37633

=== FAIL: internal/octrace TestExportSpanLinkingMaintainsParentLink (0.24s)
    observability_test.go:112: 
        	Error Trace:	D:/a/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/opencensusreceiver/internal/octrace/observability_test.go:112
        	Error:      	"[0xc00031a1a0 0xc0001aa820 0xc0001aa9c0 0xc0001aad00 0xc0001aaea0 0xc0001ab040 0xc0001ab1e0]" should have 6 item(s), but has 7
        	Test:       	TestExportSpanLinkingMaintainsParentLink
    observability_test.go:115: 
        	Error Trace:	D:/a/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/opencensusreceiver/internal/octrace/observability_test.go:115
        	Error:      	"[]" should have 1 item(s), but has 0
        	Test:       	TestExportSpanLinkingMaintainsParentLink
panic: runtime error: index out of range [0] with length 0 [recovered]
	panic: runtime error: index out of range [0] with length 0

goroutine 53 [running]:
testing.tRunner.func1.2({0x140e82e40, 0xc000324030})
	C:/hostedtoolcache/windows/go/1.22.11/x64/src/testing/testing.go:1631 +0x3f7
testing.tRunner.func1()
	C:/hostedtoolcache/windows/go/1.22.11/x64/src/testing/testing.go:1634 +0x6b6
panic({0x140e82e40?, 0xc000324030?})
	C:/hostedtoolcache/windows/go/1.22.11/x64/src/runtime/panic.go:770 +0x132
github.com/open-telemetry/opentelemetry-collector-contrib/receiver/opencensusreceiver/internal/octrace.TestExportSpanLinkingMaintainsParentLink(0xc000124680)
	D:/a/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/opencensusreceiver/internal/octrace/observability_test.go:123 +0x140c
testing.tRunner(0xc000124680, 0x140f3f470)
	C:/hostedtoolcache/windows/go/1.22.11/x64/src/testing/testing.go:1689 +0x21f
created by testing.(*T).Run in goroutine 1
	C:/hostedtoolcache/windows/go/1.22.11/x64/src/testing/testing.go:1742 +0x826

[github-actions]

Pinging code owners:

• receiver/opencensus: @open-telemetry/collector-approvers

See Adding Labels via Comments if you do not have permissions to add labels yourself.