IOManager.writeBufferToFile

char[] buf = ['H', 'E', 'L', 'L', 'O', '7', '!'];
char[] buf2;

if (!IOManager.writeBufferToFile("test_write_file.txt", buf))
  assert(0, "Operation failed at writing!");

if (!IOManager.readFileToBuffer("test_write_file.txt", buf2))
  assert(0, "Operation failed at reading!");

assert(
  buf == buf2,
  "Buffer2 does not containt the same data as Buffer1"
);