src/pkg/json/encode_test.go

// 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 (
	"testing"
)

type Optionals struct {
	Sr string `json:"sr"`
	So string `json:"so,omitempty"`

	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": [],
 "mr": {}
}`

func TestOmitEmpty(t *testing.T) {
	var o Optionals
	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)
	}
}