assertArrayEquals("Hello".getBytes(), java.util.Arrays.copyOfRange(buffer, 0, 5));
        }

        @Test
        @DisplayName("readn should throw IOException when buffer too short")
        void shouldThrowWhenBufferTooShort() {
            InputStream is = new ByteArrayInputStream("test".getBytes());
            assertThrows(IOException.class, () -> Transport.readn(is, new byte[5], 0, 10));
        }

        @Test