// Mock the read method to return simple content
                    byte[] includeContent = "192.168.1.200 INCLUDEHOST\n".getBytes();
                    int[] index = { 0 };
                    when(mock.read()).thenAnswer(inv -> {
                        if (index[0] < includeContent.length) {
                            return (int) includeContent[index[0]++] & 0xFF;
                        }
                        return -1;