diff --git a/cmd/kubeadm/app/phases/upgrade/postupgrade_others_test.go b/cmd/kubeadm/app/phases/upgrade/postupgrade_others_test.go
new file mode 100644
index 00000000000..b13ad4a7a8a
--- /dev/null
+++ b/cmd/kubeadm/app/phases/upgrade/postupgrade_others_test.go
@@ -0,0 +1,24 @@
+//go:build !windows
+// +build !windows
+
+/*
+Copyright 2023 The Kubernetes Authors.
+
+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 upgrade
+
+const (
+	missingKubeletConfig = "no kubelet component config found.*no such file or directory"
+)
diff --git a/cmd/kubeadm/app/phases/upgrade/postupgrade_test.go b/cmd/kubeadm/app/phases/upgrade/postupgrade_test.go
index 5754136be77..cd310301ffc 100644
--- a/cmd/kubeadm/app/phases/upgrade/postupgrade_test.go
+++ b/cmd/kubeadm/app/phases/upgrade/postupgrade_test.go
@@ -138,7 +138,7 @@ func TestWriteKubeletConfigFiles(t *testing.T) {
 		{
 			name:       "aggregate errs: no kubelet config file and cannot read config file",
 			dryrun:     true,
-			errPattern: "no kubelet component config found.*no such file or directory",
+			errPattern: missingKubeletConfig,
 			cfg:        &kubeadmapi.InitConfiguration{},
 		},
 		{
diff --git a/cmd/kubeadm/app/phases/upgrade/postupgrade_windows_test.go b/cmd/kubeadm/app/phases/upgrade/postupgrade_windows_test.go
new file mode 100644
index 00000000000..58550edeca8
--- /dev/null
+++ b/cmd/kubeadm/app/phases/upgrade/postupgrade_windows_test.go
@@ -0,0 +1,24 @@
+//go:build windows
+// +build windows
+
+/*
+Copyright 2023 The Kubernetes Authors.
+
+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 upgrade
+
+const (
+	missingKubeletConfig = "no kubelet component config found.*The system cannot find the file specified."
+)