Add Casbin v3 interface tests and update README

Co-authored-by: hsluoyz <3787410+hsluoyz@users.noreply.github.com>

Author: Copilot

README.md

@@ -27,7 +27,7 @@ Based on [Xorm Drivers Support](https://gitea.com/xorm/xorm#drivers-support), Th
 package main
 
 import (
-	"github.com/casbin/casbin/v2"
+	"github.com/casbin/casbin/v3"
 	_ "github.com/go-sql-driver/mysql"
 
 	"github.com/casbin/xorm-adapter/v3"
@@ -67,7 +67,7 @@ func main() {
 package main
 
 import (
-	"github.com/casbin/casbin/v2"
+	"github.com/casbin/casbin/v3"
 	_ "github.com/lib/pq"
 
 	"github.com/casbin/xorm-adapter/v3"

interface_test.go

@@ -0,0 +1,48 @@
+// Copyright 2017 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package xormadapter
+
+import (
+	"testing"
+
+	"github.com/casbin/casbin/v3/persist"
+)
+
+// TestAdapterInterface verifies that Adapter implements persist.Adapter interface for Casbin v3
+func TestAdapterInterface(t *testing.T) {
+	var _ persist.Adapter = (*Adapter)(nil)
+}
+
+// TestCasbinV3Compatibility verifies that the adapter type is compatible with Casbin v3
+func TestCasbinV3Compatibility(t *testing.T) {
+	// Create a dummy adapter (won't connect to DB in this test)
+	a := &Adapter{
+		driverName:     "mysql",
+		dataSourceName: "root:@tcp(127.0.0.1:3306)/",
+		dbSpecified:    false,
+		tableName:      "casbin_rule",
+	}
+
+	// This verifies the adapter implements persist.Adapter interface correctly
+	// If LoadPolicy method was missing, this would fail to compile
+	var adapter persist.Adapter = a
+
+	// Verify the type assertion works
+	if adapter == nil {
+		t.Fatal("Adapter should not be nil")
+	}
+
+	t.Log("Successfully verified Adapter implements persist.Adapter for Casbin v3")
+}