feat(Go-StudyExample):2021/02/09:新增merge源码阅读和单测代码

example/merge/NilOverride_test.go

@@ -0,0 +1,41 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2021/2/3 9:50
+ *  @Description：
+ */
+
+package merge
+
+import (
+	"fmt"
+	"github.com/imdario/mergo"
+	"log"
+	"testing"
+)
+
+type redisConfig2 struct {
+	Address string
+	Port    int
+	DBs     []int
+}
+
+var defaultConfig2 = redisConfig2{
+	Address: "127.0.0.1",
+	Port:    6381,
+}
+
+// 前提：需要配置 WithOverride 一起使用
+// WithOverrideEmptySlice 		空数组覆盖
+// WithOverwriteWithEmptyValue 	空字段、空数组覆盖
+func TestNilOverride(t *testing.T) {
+	var config redisConfig2
+	config.DBs = []int{2, 3}
+
+	if err := mergo.Merge(&config, defaultConfig2, mergo.WithOverride, mergo.WithOverrideEmptySlice); err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println("redis address: ", config.Address)
+	fmt.Println("redis port: ", config.Port)
+	fmt.Println("redis dbs: ", config.DBs)
+}