Test 1 : Should print 10 stdin: PBM RAW 21 24 1 1 BLACKANDWHITE twice
10 stdin: PBM RAW 21 24 1 1 BLACKANDWHITE
10 stdin: PBM RAW 21 24 1 1 BLACKANDWHITE
Test 2: Should print 1791121103 989 twice
1791121103 989
1791121103 989
Test 3: Should print 2983705297 810 twice
2983705297 810
2983705297 810
Test Invalid: Should not print anything