Improve testing script

bin/test

@@ -1,12 +1,17 @@
 #!/bin/sh
 
-# Set test variables
-export DATABASE_URL=mysql2://root:secret@mysql/test
+# We use TEST_DATABASE_URL to make sure we don't accidentaly overwrite dev/prod db
+unset DATABASE_URL; export DATABASE_URL
+[ "$TEST_DATABASE_URL" ] && export DATABASE_URL="$TEST_DATABASE_URL"
 export RAILS_ENV=test
 
 # Start virtuals X environment to allow integration testing via firefox/iceweasel
 export DISPLAY=:99
-Xvfb :99 &
+Xvfb $DISPLAY -nolisten tcp &
+XVFB_PID=$!
 
 # Start tests
 rspec
+
+# Cleanup
+kill $XVFB_PID