How to run rake thinking_sphinx:index in test environment ?

Hi,

I tried 'rake thinking_sphinx:index RAILS_ENV=test'

but it throws following error

F:\test_sarasaves\sarasaves>rake thinking_sphinx:index RAILS_ENV=test (in F:/test_sarasaves/sarasaves) Generating Configuration to F:/test_sarasaves/sarasaves/config/ test.sphinx.conf Sphinx 0.9.8-release (r1533) Copyright (c) 2001-2008, Andrew Aksyonoff

using config file 'F:/test_sarasaves/sarasaves/config/ test.sphinx.conf'... FATAL: no sources found in config file. rake aborted! The following command failed:   indexer --config F:/test_sarasaves/sarasaves/config/test.sphinx.conf --all