diff --git a/pkg/cert/GenerateAllFiles_test.go b/pkg/cert/GenerateAllFiles_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..3a8b2a7857b7d4e14ffdf297ceb3a69a26383871
--- /dev/null
+++ b/pkg/cert/GenerateAllFiles_test.go
@@ -0,0 +1,91 @@
+/*
+Copyright 2024 KylinSoft  Co., Ltd.
+
+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 cert
+
+import (
+	"nestos-kubernetes-deployer/pkg/configmanager"
+	"nestos-kubernetes-deployer/pkg/configmanager/asset"
+	"nestos-kubernetes-deployer/pkg/configmanager/globalconfig"
+	"testing"
+)
+
+func TestOsmanager(t *testing.T) {
+	configmanager.ClusterAsset["cluster"] = &asset.ClusterAsset{
+		ClusterID:    "cluster",
+		Architecture: "amd64",
+		Platform:     "libvirt",
+		OSImage:      asset.OSImage{Type: "nestos"},
+		UserName:     "root",
+		Password:     "123",
+		Master: []asset.NodeAsset{
+			{
+				Hostname: "k8s-master01",
+				IP:       "192.168.132.11",
+				HardwareInfo: asset.HardwareInfo{
+					CPU:  2,
+					RAM:  2048,
+					Disk: 30,
+				},
+			},
+		},
+		Runtime: "crio",
+		Kubernetes: asset.Kubernetes{
+			Network: asset.Network{
+				ServiceSubnet: "10.96.0.0/16",
+				PodSubnet:     "10.244.0.0/16",
+			},
+		},
+	}
+
+	configmanager.GlobalConfig = &globalconfig.GlobalConfig{
+		PersistDir: "/",
+		BootstrapUrl: globalconfig.BootstrapUrl{
+			BootstrapIgnHost: "127.0.0.1",
+			BootstrapIgnPort: "9080",
+		},
+	}
+
+	clusterconfig, err := configmanager.GetClusterConfig("cluster")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Run("NewCertGenerator_Success", func(t *testing.T) {
+		ns := NewCertGenerator(clusterconfig.ClusterID, &clusterconfig.Master[0])
+		if ns == nil {
+			t.Error("Expected non-nil NewCertGenerator instance")
+		}
+	})
+
+	ns := NewCertGenerator(clusterconfig.ClusterID, &clusterconfig.Master[0])
+	if ns == nil {
+		t.Error("Expected non-nil NewOSManager instance")
+	}
+
+	t.Run("GenerateAllFiles_Success", func(t *testing.T) {
+		if err := ns.GenerateAllFiles(); err != nil {
+			t.Errorf("Expected no error, got %v", err)
+		}
+	})
+
+	t.Run("GenerateAllFiles_Fail", func(t *testing.T) {
+		configmanager.ClusterAsset["cluster"].ServiceSubnet = ""
+		err = ns.GenerateAllFiles()
+		if err == nil {
+			t.Error("Expected error, got nil")
+		}
+	})
+}