make the testsuite a little less brittle:

- 'function fn_name\n{' breaks on older FreeBSD default shells, so use the more
  widely supported 'fn_name () {'. This needs more fixing..
- test for integers ought to use the proper operators
- test for strings ought to use quoting of the strings to be fair to strange
  implementations of test(1)
- make sure not to ignore return-codes != 0 from commands; Some shells exit
  immediately on this (much like explicitely requesting set -e in e.g. bash)

TODO:
*) Some older shells do not allow a space after the test-condition in an "if"
statement. This doesn't work:
if [ $status -ne 0 ] ; then
as opposed to this:
if [ $status -ne 0 ]; then
or this
if [ $status -ne 0 ]
then

*) strict spacing between commands. In some shells you have to say:
foo ; bar ; baz
The affected shells barf on stuff like ommitting the space, so this doesn't
work:
foo; bar   ;baz

*) $() vs. ``
The former isn't really portable as opposed to the latter.

*) fix frong assumption that the testsuite is run from the source-dir.
This is a complete misconception and renders the testsuite completely useless.


That said, i note that IMO a test-harness ought to do it's best to work in
a wide variety of environments, everything else defeats it's purpose.

testsuite/testing.sh

@@ -37,7 +37,7 @@ export SKIP=
 
 # Helper functions
 
-optional()
+optional ()
 {
   option=`echo "$OPTIONFLAGS" | egrep "(^|:)$1(:|\$)"`
   # Not set?
@@ -55,6 +55,7 @@ testing ()
 {
   NAME="$1"
   [ -z "$1" ] && NAME=$2
+  ret=0
 
   if [ $# -ne 5 ]
   then
@@ -76,12 +77,15 @@ testing ()
   echo -ne "$5" | eval "$2" > actual
   RETVAL=$?
 
-  cmp expected actual > /dev/null
-  if [ $? -ne 0 ]
+  cmp expected actual > /dev/null || ret=$?
+  if [ $ret -ne 0 ]
   then
     FAILCOUNT=$[$FAILCOUNT+1]
     echo "FAIL: $NAME"
-    [ -n "$VERBOSE" ] && diff -u expected actual
+    if [ -n "$VERBOSE" ]
+    then
+      diff -u expected actual || /bin/true
+    fi
   else
     echo "PASS: $NAME"
   fi
@@ -97,7 +101,7 @@ testing ()
 # the file is assumed to already be there and only its library dependencies
 # are copied.
 
-function mkchroot
+mkchroot ()
 {
   [ $# -lt 2 ] && return
 
@@ -126,7 +130,7 @@ function mkchroot
 # Needed commands listed on command line
 # Script fed to stdin.
 
-function dochroot
+dochroot ()
 {
   mkdir tmpdir4chroot
   mount -t ramfs tmpdir4chroot tmpdir4chroot