After trying to run the command to send the test tone to icecast I had an error
mediashout@Mediashout:/usr/local/src/liquidsoap-full/liquidsoap/src$ ./liquidsoap 'output.icecast(%vorbis, mount="test.ogg", sine())' ./liquidsoap: error while loading shared libraries: libshine.so.1: cannot open shared object file: No such file or directory
I had followed the instructions to make libshine
The/my solution was to run 'sudo ldconfig' to update the cache.
Also note that the test line won't work if you have modified the default source login for icecast. ie liquidsoap will fail to connect to icecast2.