My bash script is missing something - what?

[Richard Owlett <rowlett@cloud85.net>]

I have a trivial bash script named test.sh which has been marked 
as executable.
Its contents are:

#!/bin/bash
cat /etc/debian_version
mount | grep 'on / '

In a terminal I type:

test.sh

The response is:
bash: test.sh: command not found

I'm using Squeeze with Gnome2 as DE.
What's wrong?
TIA