From a2664e00736cf614086d237cd1cf1c1754fd45a8 Mon Sep 17 00:00:00 2001
From: Casey Marshall <cmars@cmarstech.com>
Date: Mon, 23 Mar 2015 17:07:27 -0500
Subject: [PATCH] Add round-trip JSON test.

---
 decimal_test.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/decimal_test.go b/decimal_test.go
index 7121a5c..c590d0d 100644
--- a/decimal_test.go
+++ b/decimal_test.go
@@ -1,6 +1,7 @@
 package decimal
 
 import (
+	"encoding/json"
 	"math"
 	"testing"
 )
@@ -147,6 +148,30 @@ func TestNewFromFloatWithExponent(t *testing.T) {
 	}
 }
 
+func TestJSON(t *testing.T) {
+	for _, s := range testTable {
+		var doc struct {
+			Amount Decimal `json:"amount"`
+		}
+		docStr := `{"amount":"` + s + `"}`
+		err := json.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 := json.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