storageOperationDurationSecondsMetricBefore, _ := testutil.GetHistogramMetricCount(m)

		var ee error
		unmapVolumeFunc.CompleteFunc(volumetypes.CompleteFuncParam{Err: &ee})

		storageOperationDurationSecondsMetricAfter, _ := testutil.GetHistogramMetricCount(m)
		metricValueDiff := storageOperationDurationSecondsMetricAfter - storageOperationDurationSecondsMetricBefore

	t.Helper()
	m := metrics.PluginExecutionDuration.WithLabelValues(wantPlugin, wantExtensionPoint, wantStatus.String())

	count, err := testutil.GetHistogramMetricCount(m)
	if err != nil {
		t.Errorf("Failed to get %s sampleCount, err: %v", metrics.PluginExecutionDuration.Name, err)
	}
	if count == 0 {
		t.Error("Expect at least 1 sample")
	}