Test 1: should print stdin: PPM RAW 17 22 3 255 RGB six times
stdin: PPM RAW 17 22 3 255 RGB
stdin: PPM RAW 17 22 3 255 RGB
stdin: PPM RAW 17 22 3 255 RGB
stdin: PPM RAW 17 22 3 255 RGB
stdin: PPM RAW 17 22 3 255 RGB
stdin: PPM RAW 17 22 3 255 RGB
Test 2: should print '0 0 : 0' twice
0 0 : 0
0 0 : 0