Updated the tests.

test/comparepdf.sh

+#!/bin/sh
+# This script visually compares two PDF documents on a page-by-page basis.
+
+# Print an error message and die.
+die() {
+  FORMAT="$1"; shift
+  printf "$FORMAT\n" "$@" 1>&2
+  exit 1
+}
+
+# Check if a file exist.
+exists() {
+  [ -e "$1" ] || die 'File "%s" does not exist.' "$1"
+}
+
+# Check that the input files exist.
+exists "$1" || exit 1
+exists "$2" || exit 1
+
+# Burst the input files into temporary directories.
+SOURCE_DIR=`mktemp -d` && trap 'rm -r $SOURCE_DIR' EXIT &&
+  pdftk "$1" burst output $SOURCE_DIR/%04d.pdf
+DEST_DIR=`mktemp -d` && trap 'rm -r $SOURCE_DIR $DEST_DIR' EXIT &&
+  pdftk "$2" burst output $DEST_DIR/%04d.pdf
+
+# Compare the individual pages.
+DIFFER=false; PAGES=""
+for PAGE in `((cd $SOURCE_DIR && ls *.pdf) && (cd $DEST_DIR && ls *.pdf)) | sort -u`; do
+  PAGENUM=`echo ${PAGE%%.pdf} | sed 's/^0*//'`
+  if [ -e $SOURCE_DIR/$PAGE -a ! -e $DEST_DIR/$PAGE ]; then
+    die 'The document "%s" does not contain page "%d".' "$2" $PAGENUM
+  elif [ ! -e $SOURCE_DIR/$PAGE -a -e $DEST_DIR/$PAGE ]; then
+    die 'The document "%s" does not contain page "%d".' "$1" $PAGENUM
+  else
+    if ! comparepdf --compare=appearance --verbose=0 $SOURCE_DIR/$PAGE $DEST_DIR/$PAGE; then
+      DIFFER=true
+      PAGES="$PAGES, $PAGENUM"
+    fi
+  fi    
+done
+
+# Print out the result.
+if $DIFFER; then
+  PAGES="$(echo "$PAGES" | tail -c+3)"
+  die 'The documents "%s" and "%s" differ in pages %s.' "$1" "$2" "$PAGES"
+fi

test/mu/Makefile

@@ -18,7 +18,8 @@ all:
 
 # This target runs a single test.
 expected-%.pdf: $(EXAMPLEDIR)/%.pdf
-	comparepdf --compare=appearance --verbose=1 $< $@
+	../comparepdf.sh $< $@ || \
+	{ [ "$(UPDATE_FAILED)" = true ] && mv $< $@; }
 
 # This is a dummy target.
 implode: