gpu: fix windows_gpu_info metric (#2130)

internal/headers/gdi32/gdi32_test.go

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright The Prometheus 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 gdi32_test
+
+import (
+	"testing"
+
+	"github.com/prometheus-community/windows_exporter/internal/headers/gdi32"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetGPUDevices(t *testing.T) {
+	devices, err := gdi32.GetGPUDevices()
+	require.NoError(t, err, "Failed to get GPU devices")
+
+	require.NotNil(t, devices)
+}