#!/bin/sh
# Ensure that "-" means "standard input".

. "${srcdir=.}/init.sh"; path_prepend_ ../src

fail=0

cat <<EOF > exp || fail=1
--- -
+++ b
@@ -1 +1 @@
-a
+b
EOF

echo a > a
echo b > b

returns_ 1 diff -u - b < a > out 2> err || fail=1
# Remove date and time.
sed -e 's/^\([-+*][-+*][-+*] [^	]*\)	.*/\1/' out > k; mv k out
compare exp out || fail=1

Exit $fail