functionality testing of controller in ruby on rails -


i have product controller in have method homepage , _homepage.html.erb file in views. how test method assert should response success. created productcontrllertest.rb in test/functional , wrote below code

require 'test_helper' class productcontrollertest < actioncontroller::testcase   test "should homepage"     :homepage     assert_response :success   end  end

and have routes.rb file "product/homepage"

when run test command bundle exec rake test:functionals getting error.

error nomethoderror: undefined method `authenticate' nil:nilclass

please me fix error. 

require 'test_helper' class productcontrollertest < actioncontroller::testcase   test "should homepage"     'homepage/1'     assert_response :success   end  end

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