Add test

internal/alloycli/automemlimit_nonlinux_test.go

@@ -0,0 +1,30 @@
+//go:build !linux
+// +build !linux
+
+package alloycli
+
+import (
+	"bytes"
+	"log/slog"
+	"testing"
+
+	"github.com/KimMachineGun/automemlimit/memlimit"
+	"github.com/grafana/alloy/internal/runtime/logging"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNoMemlimitErrorLogs(t *testing.T) {
+	buffer := bytes.NewBuffer(nil)
+
+	l, err := logging.New(buffer, logging.DefaultOptions)
+	require.NoError(t, err)
+
+	applyAutoMemLimit(l)
+
+	require.Equal(t, "", buffer.String())
+
+	// Linux behavior, to confirm error is logged
+	memlimit.SetGoMemLimitWithOpts(memlimit.WithLogger(slog.New(l.Handler())))
+
+	require.Contains(t, buffer.String(), "cgroups is not supported on this system")
+}