From a20d3fc3625c8ccdd025e0dff96cde5d48586b08 Mon Sep 17 00:00:00 2001
From: Paulo L F Casaretto <pcasaretto@gmail.com>
Date: Thu, 21 Apr 2016 23:33:24 -0300
Subject: [PATCH] common: Add tests for Address#UnmarshalJSON

---
 common/types.go      |  2 +-
 common/types_test.go | 38 ++++++++++++++++++++++++++++++++++++--
 2 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/common/types.go b/common/types.go
index fec9861648..d008844847 100644
--- a/common/types.go
+++ b/common/types.go
@@ -167,7 +167,7 @@ func (a Address) MarshalJSON() ([]byte, error) {
 // Parse address from raw json data
 func (a *Address) UnmarshalJSON(data []byte) error {
 	if len(data) > 2 && data[0] == '"' && data[len(data)-1] == '"' {
-		data = data[:len(data)-1][1:]
+		data = data[1 : len(data)-1]
 	}
 
 	if len(data) > 2 && data[0] == '0' && data[1] == 'x' {
diff --git a/common/types_test.go b/common/types_test.go
index f2dfbf0c95..de67cfcb5f 100644
--- a/common/types_test.go
+++ b/common/types_test.go
@@ -16,7 +16,10 @@
 
 package common
 
-import "testing"
+import (
+	"math/big"
+	"testing"
+)
 
 func TestBytesConversion(t *testing.T) {
 	bytes := []byte{5}
@@ -47,7 +50,38 @@ func TestHashJsonValidation(t *testing.T) {
 	}
 	for i, test := range tests {
 		if err := h.UnmarshalJSON(append([]byte(test.Prefix), make([]byte, test.Size)...)); err != test.Error {
-			t.Error(i, "expected", test.Error, "got", err)
+			t.Errorf("test #%d: error mismatch: have %v, want %v", i, err, test.Error)
+		}
+	}
+}
+
+func TestAddressUnmarshalJSON(t *testing.T) {
+	var a Address
+	var tests = []struct {
+		Input     string
+		ShouldErr bool
+		Output    *big.Int
+	}{
+		{"", true, nil},
+		{`""`, true, nil},
+		{`"0x"`, true, nil},
+		{`"0x00"`, true, nil},
+		{`"0xG000000000000000000000000000000000000000"`, true, nil},
+		{`"0x0000000000000000000000000000000000000000"`, false, big.NewInt(0)},
+		{`"0x0000000000000000000000000000000000000010"`, false, big.NewInt(16)},
+	}
+	for i, test := range tests {
+		err := a.UnmarshalJSON([]byte(test.Input))
+		if err != nil && !test.ShouldErr {
+			t.Errorf("test #%d: unexpected error: %v", i, err)
+		}
+		if err == nil {
+			if test.ShouldErr {
+				t.Errorf("test #%d: expected error, got none", i)
+			}
+			if a.Big().Cmp(test.Output) != 0 {
+				t.Errorf("test #%d: address mismatch: have %v, want %v", i, a.Big(), test.Output)
+			}
 		}
 	}
 }