test: improve ut coverage

fix

pkg/azureutils/azure_disk_utils.go

@@ -20,7 +20,6 @@ import (
 	"context"
 	"fmt"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"regexp"
 	"strconv"
@@ -86,9 +85,6 @@ var (
 		{Mode: csi.VolumeCapability_AccessMode_MULTI_NODE_SINGLE_WRITER},
 		{Mode: csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER},
 	}
-
-	// control the number of concurrent powershell commands running on Windows node
-	powershellCmdSem = make(chan struct{}, 3)
 )
 
 type ManagedDiskParameters struct {
@@ -830,17 +826,6 @@ func SetKeyValueInMap(m map[string]string, key, value string) {
 	m[key] = value
 }
 
-func RunPowershellCmd(command string, envs ...string) ([]byte, error) {
-	// acquire a semaphore to limit the number of concurrent operations
-	powershellCmdSem <- struct{}{}
-	defer func() { <-powershellCmdSem }()
-
-	cmd := exec.Command("powershell", "-Mta", "-NoProfile", "-Command", command)
-	cmd.Env = append(os.Environ(), envs...)
-	klog.V(6).Infof("Executing command: %q", cmd.String())
-	return cmd.CombinedOutput()
-}
-
 // GenerateVolumeName returns a PV name with clusterName prefix. The function
 // should be used to generate a name of GCE PD or Cinder volume. It basically
 // adds "<clusterName>-dynamic-" before the PV name, making sure the resulting

pkg/azureutils/azure_disk_utils_windows.go

@@ -0,0 +1,41 @@
+//go:build windows
+// +build windows
+
+/*
+Copyright 2025 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 azureutils
+
+import (
+	"os"
+	"os/exec"
+
+	"k8s.io/klog/v2"
+)
+
+// control the number of concurrent powershell commands running on Windows node
+var powershellCmdSem = make(chan struct{}, 3)
+
+func RunPowershellCmd(command string, envs ...string) ([]byte, error) {
+	// acquire a semaphore to limit the number of concurrent operations
+	powershellCmdSem <- struct{}{}
+	defer func() { <-powershellCmdSem }()
+
+	cmd := exec.Command("powershell", "-Mta", "-NoProfile", "-Command", command)
+	cmd.Env = append(os.Environ(), envs...)
+	klog.V(6).Infof("Executing command: %q", cmd.String())
+	return cmd.CombinedOutput()
+}