Don't overwhelm console with test output...

--- a/test.sh
+++ b/test.sh
@@ -24,7 +24,11 @@
 
 for i in test/test*.lua
 do
-  "$lua" "$i"
+  "$lua" "$i" > "${i%.lua}.out" 2>&1 || {
+    echo "Tests failed, printing last 30 lines of the output..."
+    tail -n 30 "${i%.lua}.out"
+    exit 1
+  }
 done
 
 mkdir -p out