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type Singleton struct {
}

var singleton *Singleton
var singleton2 *Singleton
var tag bool

func init()  {
	singleton = &Singleton{}
	singleton2 = &Singleton{}
}

func GetInstance() *Singleton{
	tag = !tag
	if tag{
		return singleton
	}
	return singleton2
}

import (
	. "github.com/smartystreets/goconvey/convey"
	"github.com/stretchr/testify/assert"
	"testing"
)

func TestGetInstance(t *testing.T) {
	Convey("grpc server test", t, func() {
		a := GetInstance()
		b := GetInstance()
		assert.Equal(t, a, b)
	})
}

          单例本身没有问题，但是你代码中 singleton 的申明是需要加上字段的；另外 assert.Equal 直接调用也是有问题的，不会判断地址值而是判断的对象值。参考：[https://github.com/stretchr/testify/issues/1076](https://github.com/stretchr/testify/issues/1076)

func TestGetInstance(t *testing.T) {
	s1 := GetInstance()
	s2 := GetInstance()
	s3 := GetLazyInstance()
	s4 := GetLazyInstance()
	assert.Equal(t, reflect.ValueOf(s1).Pointer(), reflect.ValueOf(s2).Pointer())
	assert.Equal(t, reflect.ValueOf(s3).Pointer(), reflect.ValueOf(s4).Pointer())
	assert.NotEqual(t, reflect.ValueOf(s2).Pointer(), reflect.ValueOf(s3).Pointer())
}