chore: Remove registry based perfdata collector (#1742)

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/utils/testutils/testutils.go

@@ -0,0 +1,87 @@
+//go:build windows
+
+package testutils
+
+import (
+	"io"
+	"log/slog"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/alecthomas/kingpin/v2"
+	"github.com/prometheus-community/windows_exporter/internal/mi"
+	"github.com/prometheus-community/windows_exporter/pkg/collector"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/stretchr/testify/require"
+)
+
+func FuncBenchmarkCollector[C collector.Collector](b *testing.B, name string, collectFunc collector.BuilderWithFlags[C]) {
+	b.Helper()
+
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+
+	c := collectFunc(kingpin.CommandLine)
+	collectors := collector.New(map[string]collector.Collector{name: c})
+	require.NoError(b, collectors.Build(logger))
+
+	metrics := make(chan prometheus.Metric)
+
+	go func() {
+		for {
+			<-metrics
+		}
+	}()
+
+	for i := 0; i < b.N; i++ {
+		require.NoError(b, c.Collect(metrics))
+	}
+}
+
+func TestCollector[C collector.Collector, V interface{}](t *testing.T, fn func(*V) C, conf *V) {
+	t.Helper()
+
+	var (
+		metrics []prometheus.Metric
+		err     error
+	)
+
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	c := fn(conf)
+	ch := make(chan prometheus.Metric, 10000)
+
+	miApp, err := mi.Application_Initialize()
+	require.NoError(t, err)
+
+	miSession, err := miApp.NewSession(nil)
+	require.NoError(t, err)
+
+	t.Cleanup(func() {
+		require.NoError(t, c.Close())
+		require.NoError(t, miSession.Close())
+		require.NoError(t, miApp.Close())
+	})
+
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+
+	go func() {
+		defer wg.Done()
+
+		for metric := range ch {
+			metrics = append(metrics, metric)
+		}
+	}()
+
+	require.NoError(t, c.Build(logger, miSession))
+
+	time.Sleep(1 * time.Second)
+
+	require.NoError(t, c.Collect(ch))
+
+	close(ch)
+
+	wg.Wait()
+
+	require.NotEmpty(t, metrics)
+}