mi: fix native return-value handling (#2537)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/headers/hcs/hcs_test.go

@@ -18,16 +18,38 @@
 package hcs_test
 
 import (
+	"errors"
 	"testing"
 
 	"github.com/prometheus-community/windows_exporter/internal/headers/hcs"
 	"github.com/stretchr/testify/require"
 )
 
+// skipWithoutHCS skips the test if the Host Compute Service is not available,
+// e.g. on hosts without the Containers feature.
+func skipWithoutHCS(t *testing.T, err error) {
+	t.Helper()
+
+	if errors.Is(err, hcs.ErrServiceNotAvailable) {
+		t.Skip("Host Compute Service is not available")
+	}
+}
+
+func TestCreateOperation(t *testing.T) {
+	t.Parallel()
+
+	operation, err := hcs.CreateOperation()
+	require.NoError(t, err)
+	require.NotZero(t, operation)
+
+	hcs.CloseOperation(operation)
+}
+
 func TestGetContainers(t *testing.T) {
 	t.Parallel()
 
 	containers, err := hcs.GetContainers()
+	skipWithoutHCS(t, err)
 	require.NoError(t, err)
 	require.NotNil(t, containers)
 }
@@ -36,6 +58,7 @@ func TestOpenContainer(t *testing.T) {
 	t.Parallel()
 
 	containers, err := hcs.GetContainers()
+	skipWithoutHCS(t, err)
 	require.NoError(t, err)
 
 	if len(containers) == 0 {
@@ -51,5 +74,6 @@ func TestOpenContainerNotFound(t *testing.T) {
 	t.Parallel()
 
 	_, err := hcs.GetContainerStatistics("f3056b79b36ddfe203376473e2aeb4922a8ca7c5d8100764e5829eb5552fe09b")
+	skipWithoutHCS(t, err)
 	require.ErrorIs(t, err, hcs.ErrIDNotFound)
 }