gcc/libgo/go/encoding/json/encode_test.go

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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package json
import (
"bytes"
"math"
"reflect"
"testing"
)
type Optionals struct {
Sr string `json:"sr"`
So string `json:"so,omitempty"`
Sw string `json:"-"`
Ir int `json:"omitempty"` // actually named omitempty, not an option
Io int `json:"io,omitempty"`
Slr []string `json:"slr,random"`
Slo []string `json:"slo,omitempty"`
Mr map[string]interface{} `json:"mr"`
Mo map[string]interface{} `json:",omitempty"`
}
var optionalsExpected = `{
"sr": "",
"omitempty": 0,
"slr": null,
"mr": {}
}`
func TestOmitEmpty(t *testing.T) {
var o Optionals
o.Sw = "something"
o.Mr = map[string]interface{}{}
o.Mo = map[string]interface{}{}
got, err := MarshalIndent(&o, "", " ")
if err != nil {
t.Fatal(err)
}
if got := string(got); got != optionalsExpected {
t.Errorf(" got: %s\nwant: %s\n", got, optionalsExpected)
}
}
type StringTag struct {
BoolStr bool `json:",string"`
IntStr int64 `json:",string"`
StrStr string `json:",string"`
}
var stringTagExpected = `{
"BoolStr": "true",
"IntStr": "42",
"StrStr": "\"xzbit\""
}`
func TestStringTag(t *testing.T) {
var s StringTag
s.BoolStr = true
s.IntStr = 42
s.StrStr = "xzbit"
got, err := MarshalIndent(&s, "", " ")
if err != nil {
t.Fatal(err)
}
if got := string(got); got != stringTagExpected {
t.Fatalf(" got: %s\nwant: %s\n", got, stringTagExpected)
}
// Verify that it round-trips.
var s2 StringTag
err = NewDecoder(bytes.NewBuffer(got)).Decode(&s2)
if err != nil {
t.Fatalf("Decode: %v", err)
}
if !reflect.DeepEqual(s, s2) {
t.Fatalf("decode didn't match.\nsource: %#v\nEncoded as:\n%s\ndecode: %#v", s, string(got), s2)
}
}
// byte slices are special even if they're renamed types.
type renamedByte byte
type renamedByteSlice []byte
type renamedRenamedByteSlice []renamedByte
func TestEncodeRenamedByteSlice(t *testing.T) {
s := renamedByteSlice("abc")
result, err := Marshal(s)
if err != nil {
t.Fatal(err)
}
expect := `"YWJj"`
if string(result) != expect {
t.Errorf(" got %s want %s", result, expect)
}
r := renamedRenamedByteSlice("abc")
result, err = Marshal(r)
if err != nil {
t.Fatal(err)
}
if string(result) != expect {
t.Errorf(" got %s want %s", result, expect)
}
}
var unsupportedValues = []interface{}{
math.NaN(),
math.Inf(-1),
math.Inf(1),
}
func TestUnsupportedValues(t *testing.T) {
for _, v := range unsupportedValues {
if _, err := Marshal(v); err != nil {
if _, ok := err.(*UnsupportedValueError); !ok {
t.Errorf("for %v, got %T want UnsupportedValueError", v, err)
}
} else {
t.Errorf("for %v, expected error", v)
}
}
}
// Ref has Marshaler and Unmarshaler methods with pointer receiver.
type Ref int
func (*Ref) MarshalJSON() ([]byte, error) {
return []byte(`"ref"`), nil
}
func (r *Ref) UnmarshalJSON([]byte) error {
*r = 12
return nil
}
// Val has Marshaler methods with value receiver.
type Val int
func (Val) MarshalJSON() ([]byte, error) {
return []byte(`"val"`), nil
}
func TestRefValMarshal(t *testing.T) {
var s = struct {
R0 Ref
R1 *Ref
V0 Val
V1 *Val
}{
R0: 12,
R1: new(Ref),
V0: 13,
V1: new(Val),
}
const want = `{"R0":"ref","R1":"ref","V0":"val","V1":"val"}`
b, err := Marshal(&s)
if err != nil {
t.Fatalf("Marshal: %v", err)
}
if got := string(b); got != want {
t.Errorf("got %q, want %q", got, want)
}
}
// C implements Marshaler and returns unescaped JSON.
type C int
func (C) MarshalJSON() ([]byte, error) {
return []byte(`"<&>"`), nil
}
func TestMarshalerEscaping(t *testing.T) {
var c C
const want = `"\u003c\u0026\u003e"`
b, err := Marshal(c)
if err != nil {
t.Fatalf("Marshal: %v", err)
}
if got := string(b); got != want {
t.Errorf("got %q, want %q", got, want)
}
}
type IntType int
type MyStruct struct {
IntType
}
func TestAnonymousNonstruct(t *testing.T) {
var i IntType = 11
a := MyStruct{i}
const want = `{"IntType":11}`
b, err := Marshal(a)
if err != nil {
t.Fatalf("Marshal: %v", err)
}
if got := string(b); got != want {
t.Errorf("got %q, want %q", got, want)
}
}