feat(dns): add leak check report log

internal/dns/leak_test.go

@@ -0,0 +1,22 @@
+package dns
+
+import (
+	"context"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Test_leakCheck(t *testing.T) {
+	t.Parallel()
+
+	const timeout = 10 * time.Second
+	ctx, cancel := context.WithTimeout(t.Context(), timeout)
+	t.Cleanup(cancel)
+	client := http.DefaultClient
+	report, err := leakCheck(ctx, client)
+	require.NoError(t, err)
+	require.NotEmpty(t, report)
+}