possible use of test assertions in defining/expressing requirements?

A possible resource for use at some stage of our work - use of test assertions (for example, as a technique for expressing any
requirements we develop as we were discussing at the last teleconference) - (although it's primarily designed for specification development, may have some applicability/usefulness to us?)

A resource link is:
http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=tag#technical

Thanks and best wishes
Tim Boland NIST