w.CalledReader = r
	return io.Copy(io.Discard, r)
}

func (w *mockTransferWriter) Write(p []byte) (int, error) {
	w.WriteCalled = true
	return io.Discard.Write(p)
}

func TestTransferWriterWriteBodyReaderTypes(t *testing.T) {
	fileType := reflect.TypeFor[*os.File]()
	bufferType := reflect.TypeFor[*bytes.Buffer]()

	nBytes := int64(1 << 10)
	newFileFunc := func() (r io.Reader, done func(), err error) {