#!/bin/sh

. ${top_srcdir-.}/tests/common.sh

cat << EOF > orig
-- 
EOF
cat << EOF > new1
++
EOF
cat << EOF > new2
b
EOF

cp new1 start
${DIFF} -u orig new1 > patch1
${DIFF} -u orig new2 > patch2
${INTERDIFF} patch1 patch2 2>errors > patch1-2 || exit 1
[ -s errors ] && exit 1
${PATCH} < patch1-2 || exit 1
cmp new1 new2 || exit 1
${PATCH} -R < patch1-2
cmp new1 start || exit 1

mv new1 tmp
mv new2 new1
mv tmp new2
cp new1 start
${DIFF} -u orig new1 > patch3
${DIFF} -u orig new2 > patch4
${INTERDIFF} patch3 patch4 2>errors > patch3-4 || exit 1
[ -s errors ] && exit 1
${PATCH} < patch3-4 || exit 1
cmp new1 new2 || exit 1
${PATCH} -R < patch3-4
cmp new1 start || exit 1