diff --git a/adapter_test.go b/adapter_test.go
new file mode 100644
index 0000000..16314c9
--- /dev/null
+++ b/adapter_test.go
@@ -0,0 +1,69 @@
+package casbinbunadapter
+
+import (
+	"testing"
+
+	"github.com/casbin/casbin/v2"
+	"github.com/casbin/casbin/v2/util"
+)
+
+func testGetPolicy(t *testing.T, e *casbin.Enforcer, want [][]string) {
+	got := e.GetPolicy()
+
+	if !util.Array2DEquals(want, got) {
+		t.Errorf("got %v, want %v", got, want)
+	}
+}
+
+func initPolicy(t *testing.T, adapter *bunAdapter) {
+	e, err := casbin.NewEnforcer("testdata/rbac_model.conf", "testdata/rbac_policy.csv")
+	if err != nil {
+		panic(err)
+	}
+
+	if err := adapter.SavePolicy(e.GetModel()); err != nil {
+		panic(err)
+	}
+
+	e.ClearPolicy()
+	testGetPolicy(t, e, [][]string{})
+
+	if err := adapter.LoadPolicy(e.GetModel()); err != nil {
+		panic(err)
+	}
+	testGetPolicy(
+		t,
+		e,
+		[][]string{{"alice", "data1", "read"}, {"bob", "data2", "write"}, {"data2_admin", "data2", "read"}, {"data2_admin", "data2", "write"}},
+	)
+}
+
+func initAdapter(t *testing.T, driverName, dataSourceName string, opts ...adapterOption) *bunAdapter {
+	a, err := NewAdapter(driverName, dataSourceName, opts...)
+	if err != nil {
+		panic(err)
+	}
+
+	initPolicy(t, a)
+
+	return a
+}
+
+func TestBunAdapter_AddPolicy(t *testing.T) {
+	a := initAdapter(t, "mysql", "root:root@tcp(127.0.0.1:3306)/test")
+	e, err := casbin.NewEnforcer("testdata/rbac_model.conf", a)
+	if err != nil {
+		t.Fatalf("failed to create enforcer: %v", err)
+	}
+	if _, err := e.AddPolicy("jack", "data1", "read"); err != nil {
+		t.Fatalf("failed to add policy: %v", err)
+	}
+	if err := e.LoadPolicy(); err != nil {
+		t.Fatalf("failed to load policy: %v", err)
+	}
+	testGetPolicy(
+		t,
+		e,
+		[][]string{{"alice", "data1", "read"}, {"bob", "data2", "write"}, {"data2_admin", "data2", "read"}, {"data2_admin", "data2", "write"}, {"jack", "data1", "read"}},
+	)
+}