test/runner will now exit with non-zero status on any failure

test/runner

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 #  Copyright (C) 2014  LoVullo Associates, Inc.
 #
@@ -40,13 +40,15 @@ htmlindex <<EOH
     <ul>
 EOH
 
-find . -name '*.xspec' | while read spec; do
-  ../tools/xspec/bin/xspec.sh "$spec"
+declare -i status=0
+while read spec; do
+  ../tools/xspec/bin/xspec.sh "$spec" \
+    || status=1
 
   result="$( basename "$spec" .xspec )-result.html"
   printf '      <li><a href="%s">%s</a></li>' "$result" "$spec" \
     | htmlindex
-done
+done < <( find . -name '*.xspec' )
 
 htmlindex <<EOF
     </ul>
@@ -54,3 +56,5 @@ htmlindex <<EOF
 </html>
 EOF
 
+test "$status" -eq 0
+