Add tests for Windows service functionality

- Add unit tests for service functions on non-Windows platforms
- Verify proper error handling when service functions are called on Linux
- Ensure isWindowsService returns false on non-Windows platforms

Co-authored-by: rbtr <[email protected]>

Author: Copilot

cns/service/service_test.go

@@ -0,0 +1,37 @@
+//go:build !windows
+// +build !windows
+
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// TestServiceFunctionsOnNonWindows tests that service functions return appropriate errors on non-Windows platforms
+func TestServiceFunctionsOnNonWindows(t *testing.T) {
+	t.Run("installService should fail on non-Windows", func(t *testing.T) {
+		err := installService()
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "only supported on Windows")
+	})
+
+	t.Run("uninstallService should fail on non-Windows", func(t *testing.T) {
+		err := uninstallService()
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "only supported on Windows")
+	})
+
+	t.Run("runAsService should fail on non-Windows", func(t *testing.T) {
+		err := runAsService()
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "only supported on Windows")
+	})
+
+	t.Run("isWindowsService should return false on non-Windows", func(t *testing.T) {
+		isService, err := isWindowsService()
+		assert.NoError(t, err)
+		assert.False(t, isService)
+	})
+}