Unsupport charges and discounts in NFSe addon

addons/br/nfse/invoices.go

@@ -0,0 +1,19 @@
+package nfse
+
+import (
+	"github.com/invopop/gobl/bill"
+	"github.com/invopop/validation"
+)
+
+func validateInvoice(inv *bill.Invoice) error {
+	return validation.ValidateStruct(inv,
+		validation.Field(&inv.Charges,
+			validation.Empty.Error("not supported by nfse"),
+			validation.Skip,
+		),
+		validation.Field(&inv.Discounts,
+			validation.Empty.Error("not supported by nfse"),
+			validation.Skip,
+		),
+	)
+}

addons/br/nfse/invoices_test.go

@@ -0,0 +1,60 @@
+package nfse_test
+
+import (
+	"testing"
+
+	"github.com/invopop/gobl/addons/br/nfse"
+	"github.com/invopop/gobl/bill"
+	"github.com/invopop/gobl/num"
+	"github.com/invopop/gobl/tax"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestInvoicesValidation(t *testing.T) {
+	tests := []struct {
+		name string
+		inv  *bill.Invoice
+		err  string
+	}{
+		{
+			name: "valid invoice",
+			inv:  &bill.Invoice{},
+		},
+		{
+			name: "charges present",
+			inv: &bill.Invoice{
+				Charges: []*bill.Charge{
+					{
+						Amount: num.MakeAmount(100, 2),
+					},
+				},
+			},
+			err: "charges: not supported by nfse.",
+		},
+		{
+			name: "discounts present",
+			inv: &bill.Invoice{
+				Discounts: []*bill.Discount{
+					{
+						Amount: num.MakeAmount(100, 2),
+					},
+				},
+			},
+			err: "discounts: not supported by nfse.",
+		},
+	}
+
+	addon := tax.AddonForKey(nfse.V1)
+	for _, ts := range tests {
+		t.Run(ts.name, func(t *testing.T) {
+			err := addon.Validator(ts.inv)
+			if ts.err == "" {
+				assert.NoError(t, err)
+			} else {
+				if assert.Error(t, err) {
+					assert.Contains(t, err.Error(), ts.err)
+				}
+			}
+		})
+	}
+}

addons/br/nfse/nfse.go

@@ -32,6 +32,8 @@ func newAddon() *tax.AddonDef {
 
 func validate(doc any) error {
 	switch obj := doc.(type) {
+	case *bill.Invoice:
+		return validateInvoice(obj)
 	case *bill.Line:
 		return validateLine(obj)
 	case *org.Item: