#! /bin/bash
# This script tests: ppmshift
# Also requires: pgmtoppm

echo "Test 1. Should print: 3705777303 101484"
ppmshift -seed=1 10 testimg.ppm | cksum

echo "Test 2. Should print: 202790723 685"
ppmshift -seed=1 1 testgrid.pbm | cksum

echo "Test 3. Should print: 0 0 : 0"
ppmshift -seed=1 0 testimg.ppm | cmp -s - testimg.ppm
  echo ${PIPESTATUS[@]} ":" $?

tmpdir=${tmpdir:-/tmp}
test0_ppm=${tmpdir}/test0.ppm
test14_ppm=${tmpdir}/test14.ppm

pgmtoppm < maze.pbm > ${test0_ppm}

echo "Test 4.  Should print: 0 0 : 0"
  ppmshift -seed=2 0 maze.pbm | cmp -s - ${test0_ppm}
    echo ${PIPESTATUS[@]} ":" $?

ppmshift -seed=2 14 maze.pbm > ${test14_ppm}

for i in 1 15 16 20 1000
  do
  echo "Test 5. ("$i") Should print: 1 twice"
  ppmshift -seed=2 $i maze.pbm | cmp -s - ${test0_ppm}
    echo $?
  ppmshift -seed=2 $i maze.pbm | cmp -s - ${test14_ppm}
    echo $?
  done

# In Test 5 the image files are not supposed to match.
# When cmp finds a difference, it may terminate and stop reading input from
# the pipe at that point.  This may cause a "broken pipe" exception; however
# this does not always happen.  The broken pipe shows up as a non-zero value
# for ${PIPESTATUS[0]}.

rm ${test0_ppm} ${test14_ppm}