t.Errorf("Expected %v, got %v; %#v", e, a, q)
		}
		q2, err := ParseQuantity(q.String())
		if err != nil {
			t.Errorf("Round trip failed on %v", q)
		}
		if e, a := item.value, q2.ScaledValue(item.scale); e != a {
			t.Errorf("Expected %v, got %v", e, a)
		}
		q3 := NewQuantity(0, DecimalSI)
		q3.SetScaled(item.value, item.scale)
		if q.Cmp(*q3) != 0 {