prediction tests a go

ledger/register.go

@@ -100,3 +100,19 @@ func dateToTime(s string) (time.Time, error) {
 	}
 	return time.Time{}, fmt.Errorf("no layout matching %q", s)
 }
+
+func (register Register) Debug() string {
+	result := "{"
+	for _, date := range register.Dates() {
+		result += "{" + date
+		for name, balance := range register[date] {
+			result += "{" + name
+			for cur, v := range balance {
+				result += fmt.Sprintf("%s=%.2f ", cur, v)
+			}
+			result += "}"
+		}
+		result += "}"
+	}
+	return result + "}"
+}