$ perl -T -Iblib/lib -Iblib/arch t/clean.t
not ok 3 - $tidy->clean("") returns empty HTML document
# Failed test '$tidy->clean("") returns empty HTML document'
# at t/clean.t line 20.
# '
#
#
#
#
#
#
#
#
# '
# doesn't match '(?^:
#
#
#
#
#
#
#
#
# )'
Looks like you failed 1 test of 3.