TestTimeout test in the go.opentelemetry.io/otel/exporters/otlp/otlphttp fails sporadically

[MrAlias]

Description

2021-05-12T15:39:34.6691600Z --- FAIL: TestTimeout (0.83s)
2021-05-12T15:39:34.6790890Z     driver_test.go:191: 
2021-05-12T15:39:34.6891720Z         	Error Trace:	driver_test.go:191
2021-05-12T15:39:34.6992730Z         	Error:      	Not equal: 
2021-05-12T15:39:34.7089470Z         	            	expected: true
2021-05-12T15:39:34.7191690Z         	            	actual  : false
2021-05-12T15:39:34.7292350Z         	Test:       	TestTimeout
2021-05-12T15:39:34.7392480Z FAIL
2021-05-12T15:39:34.7494210Z FAIL	go.opentelemetry.io/otel/exporters/otlp/otlphttp	16.839s
2021-05-12T15:39:34.7573920Z make: *** [test] Error 1
2021-05-12T15:39:34.7574410Z FAIL

opentelemetry-go/exporters/otlp/otlphttp/driver_test.go

Lines 173 to 192 in b6d5442

	func TestTimeout(t *testing.T) {
	mcCfg := mockCollectorConfig{
	InjectDelay: 100 * time.Millisecond,
	}
	mc := runMockCollector(t, mcCfg)
	defer mc.MustStop(t)
	driver := otlphttp.NewDriver(
	otlphttp.WithEndpoint(mc.Endpoint()),
	otlphttp.WithInsecure(),
	otlphttp.WithTimeout(50*time.Millisecond),
	)
	ctx := context.Background()
	exporter, err := otlp.NewExporter(ctx, driver)
	require.NoError(t, err)
	defer func() {
	assert.NoError(t, exporter.Shutdown(ctx))
	}()
	err = exporter.ExportSpans(ctx, otlptest.SingleReadOnlySpan())
	assert.Equal(t, true, os.IsTimeout(err))
	}

Environment

• OS: Mac OS X 10.15.7
• Architecture: amd64
• Go Version: 1.15
• opentelemetry-go version: b6d5442

Test Failure Logs

log.txt