func TestSub(t *testing.T) {
v1 := amount.NewAmount([]quant.Quant{
{Pillule, 12},
{Tablette, 2},
{Boite, 2},
{Carton, 1},
}...)
t.Log(v1.String())
v2 := amount.NewAmount([]quant.Quant{
{Pillule, 16},
{Tablette, 3},
{Boite, 2},
}...)
t.Log(v2.String())
got := amount.Sub(v1, v2)
t.Log(got.String())
t.Log(got.TotalWithRound(Carton))
exp := amount.NewAmount([]quant.Quant{
{Pillule, 11},
{Tablette, 1},
{Boite, 9},
{Carton, 0},
}...)
ValEqualCheck(t, got, exp)
}
// Sub creates a list by subtracting value from right item
// to matching left item, append the non-matching left items
// and append the negative of the right non-matching items
func Sub(ins, subs Items) Items {
its := ins.Copy()
for key, sub := range subs {
if it, ok := its[key]; ok {
sub.Amount = amount.Sub(it.Amount, sub.Amount)
} else {
sub.Amount = sub.Amount.Neg()
}
its[key] = sub
}
return its
}