Add XML test.

decimal_test.go

@@ -2,6 +2,7 @@ package decimal
 
 import (
 	"encoding/json"
+	"encoding/xml"
 	"math"
 	"testing"
 )
@@ -172,6 +173,31 @@ func TestJSON(t *testing.T) {
 	}
 }
 
+func TestXML(t *testing.T) {
+	for _, s := range testTable {
+		var doc struct {
+			XMLName xml.Name `xml:"account"`
+			Amount  Decimal  `xml:"amount"`
+		}
+		docStr := `<account><amount>` + s + `</amount></account>`
+		err := xml.Unmarshal([]byte(docStr), &doc)
+		if err != nil {
+			t.Errorf("error unmarshaling %s: %v", docStr, err)
+		} else if doc.Amount.String() != s {
+			t.Errorf("expected %s, got %s (%s, %d)",
+				s, doc.Amount.String(),
+				doc.Amount.value.String(), doc.Amount.exp)
+		}
+
+		out, err := xml.Marshal(&doc)
+		if err != nil {
+			t.Errorf("error marshaling %+v: %v", doc, err)
+		} else if string(out) != docStr {
+			t.Errorf("expected %s, got %s", docStr, string(out))
+		}
+	}
+}
+
 func TestDecimal_rescale(t *testing.T) {
 	type Inp struct {
 		int     int64