Add new file

datastructure/listnode_test.go

+package datastructure
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestStringToListNode(t *testing.T) {
+	// StringToListNode 本目录
+	root := StringToListNode("[5,4,5,1,1,5]")
+	// 输出：0xc000088770
+	println(root)
+	// &{5 0xc000088760}
+	fmt.Println(root)
+	// 断言另说
+
+}