Instead of doing "g testing" some people prefer it without the "g" (or any other search shortcut). Here's how to get that to work:
- Go to opera:config#network
- Disable "Check Local HostName"
- Disable "Enable HostName Expansion"
- Enable "Enable HostName Web Lookup"
- Put the search url (you can find ready to go ones in the search preferences) into "HostName Web Lookup Address"
- Press save under the section and you're done!