feat(Go-StudyExample):2020/12/31：新增【Go每日一库】go-cmp结构体比较工具

example/go-cmp/NoExported_test.go

@@ -0,0 +1,95 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/12/30 15:21
+ *  @Description：测试未导出字段
+ */
+
+package go_cmp
+
+import (
+	"fmt"
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+	"reflect"
+	"testing"
+)
+
+//自定义是否比较未导出字段，这个方法和上面的很类似，都是必须制定相应的结构体
+func TestDiyExportMethod(t *testing.T) {
+	u1 := User2{"dj", 18, Address{}}
+	u2 := User2{"dj", 18, Address{}}
+
+	fmt.Println("u1 equals u2?", cmp.Equal(u1, u2, cmp.Exporter(allowUnExportedInType)))
+}
+
+//测试只忽略当前对象的未导出属性
+func TestExportOne(t *testing.T) {
+	c1 := Contactx{Phone: "123456789", Email: "dj@example.com"}
+	c2 := Contactx{Phone: "123456789", Email: "dj@example.com"}
+
+	u1 := Userx{"dj", 18, c1}
+	u2 := Userx{"dj", 18, c2}
+
+	//i think 通过 IgnoreUnexported 这个属性可以实现忽略具体类型的未导出字段，但是好像没办法忽略 【指针类型】 的未导出字段
+	fmt.Println("u1 equals u2?", cmp.Equal(u1, u2, cmpopts.IgnoreUnexported(Userx{})))
+}
+
+//结构体中有未导出字段的时候,通过Equal进行比较的时候，会报错，除非设置忽略
+func TestExportError(t *testing.T) {
+	c1 := &Contact1{Phone: "123456789", Email: "dj@example.com"}
+	c2 := &Contact1{Phone: "123456789", Email: "dj@example.com"}
+
+	u1 := User1{"dj", 18, c1}
+	u2 := User1{"dj", 18, c2}
+
+	fmt.Println("u1 equals u2?", cmp.Equal(u1, u2))
+}
+
+//使用 【IgnoreUnexported】,但是在结构体下层还有其他非导出的字段也会报错，这个字段没办法深入到里面
+func TestExportError2(t *testing.T) {
+	u11 := User2{"dj", 18, Address{}}
+	u22 := User2{"dj", 18, Address{}}
+
+	fmt.Println("u1 equals u2?", cmp.Equal(u11, u22, cmpopts.IgnoreUnexported(User2{})))
+}
+
+func allowUnExportedInType(t reflect.Type) bool {
+	if t.Name() == "Address" {
+		return true
+	}
+
+	return false
+}
+
+type Contactx struct {
+	Phone string
+	Email string
+}
+
+type Userx struct {
+	Name    string
+	Age     int
+	contact Contactx //注意这边是结构体
+}
+
+type Contact1 struct {
+	Phone string
+	Email string
+}
+
+type User1 struct {
+	Name    string
+	Age     int
+	contact *Contact1
+}
+
+type Address struct {
+	Province string
+	city     string
+}
+
+type User2 struct {
+	Name    string
+	Age     int
+	Address Address
+}