diff --git a/routers/api/v1/activitypub/repository_test.go b/routers/api/v1/activitypub/repository_test.go
index b9349029c4..bd593b27af 100644
--- a/routers/api/v1/activitypub/repository_test.go
+++ b/routers/api/v1/activitypub/repository_test.go
@@ -1,3 +1,24 @@
 package activitypub
 
-// ToDo: maybe some unit tests for the functions written in repository.go
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/user"
+)
+
+func Test_UserEmailValidate(t *testing.T) {
+	sut := "ab@cd.ef"
+	if err := user.ValidateEmail(sut); err != nil {
+		t.Errorf("sut should be valid, %v, %v", sut, err)
+	}
+
+	sut = "83ce13c8-af0b-4112-8327-55a54e54e664@code.cartoon-aa.xyz"
+	if err := user.ValidateEmail(sut); err != nil {
+		t.Errorf("sut should be valid, %v, %v", sut, err)
+	}
+
+	sut = "1"
+	if err := user.ValidateEmail(sut); err == nil {
+		t.Errorf("sut should not be valid, %v", sut)
+	}
+}