fix test break

testing/mocks/mockuserset.go

@@ -0,0 +1,23 @@
+package mocks
+
+import (
+	"github.com/v2ray/v2ray-core"
+)
+
+type MockUserSet struct {
+	UserIds    []core.ID
+	UserHashes map[string]int
+}
+
+func (us *MockUserSet) AddUser(user core.User) error {
+	us.UserIds = append(us.UserIds, user.Id)
+	return nil
+}
+
+func (us *MockUserSet) GetUser(userhash []byte) (*core.ID, bool) {
+	idx, found := us.UserHashes[string(userhash)]
+	if found {
+		return &us.UserIds[idx], true
+	}
+	return nil, false
+}