Trouble with assert_template with Partial

gistfile1.rb

assert_template(:partial => 'shared/_item_variant_table_title')
#ArgumentError: assertion message must be String or Proc: 
#<expecting partial <"shared/_item_variant_table_title"> but action rendered
# <["shared/_item_variant_table_title",
# "_item_variant_table_title",
# "shared/_flash_div",
# "_flash_div"]>>(<Test::Unit::Assertions::AssertionMessage>)

assert_template(:partial => 'shared/_item_variant_table_title', :count => 1)
#ArgumentError: assertion message must be String or Proc: 
#<expecting "shared/_item_variant_table_title" to be rendered 1 time(s) but rendered 1 time(s)>(<Test::Unit::Assertions::AssertionMessage>)