func TestReadFromPanicReader(t *testing.T) {

	// First verify non-panic behaviour
	var buf Buffer
	i, err := buf.ReadFrom(panicReader{})
	if err != nil {
		t.Fatal(err)
	}
	if i != 0 {
		t.Fatalf("unexpected return from bytes.ReadFrom (1): got: %d, want %d", i, 0)
	}
	check(t, "TestReadFromPanicReader (1)", &buf, "")

	// Confirm that when Reader panics, the empty buffer remains empty

		sr, ok := rc.(*sendFileReader)
		if ok {
			// Sendfile sends in 4MiB chunks per sendfile syscall which is more than enough
			// for most setups.
			_, err = rf.ReadFrom(sr.Reader)
			if !xnet.IsNetworkOrHostDown(err, true) { // do not need to log disconnected clients
				storageLogIf(r.Context(), err)
			}
			if err == nil || !errors.Is(err, xhttp.ErrNotImplemented) {
				return