Fix and test for delete user (#1713)

* Fix and test for delete user

* Run updates in batches

* Unit test

models/main_test.go

@@ -0,0 +1,26 @@
+package models
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"code.gitea.io/gitea/modules/setting"
+)
+
+func TestMain(m *testing.M) {
+	if err := CreateTestEngine(); err != nil {
+		fmt.Printf("Error creating test engine: %v\n", err)
+		os.Exit(1)
+	}
+
+	setting.AppURL = "https://try.gitea.io/"
+	setting.RunUser = "runuser"
+	setting.SSH.Port = 3000
+	setting.SSH.Domain = "try.gitea.io"
+	setting.RepoRootPath = filepath.Join(os.TempDir(), "repos")
+	setting.AppDataPath = filepath.Join(os.TempDir(), "appdata")
+
+	os.Exit(m.Run())
+}