expected := &Metrics{}
	if !volumetest.MetricsEqualIgnoreTimestamp(actual, expected) {
		t.Errorf("Expected empty Metrics from uninitialized MetricsBlock, actual %v", *actual)
	}
	if err == nil {
		t.Errorf("Expected error when calling GetMetrics on uninitialized MetricsBlock, actual nil")
	}

	metrics = NewMetricsBlock("/nonexistent/device/node")
	actual, err = metrics.GetMetrics()