Remove "file" from test/toppm
PATH=${PWD%code*}code:$PATH
python -m pngsuite basn2c08 |
-pripngtopam - | file - | grep -q -i 'netpbm.*pixmap'
+pripngtopam - |
+# The last 3072(3x32x32) bytes are binary data; extract header
+head -c -3072 | tr -cs 0-9A-Z ' ' | grep -q 'P6 32 32 255'
