test a non active_record class in models directory in rails 3?

hi
i have a non active_record class in models dir which is like following:

class BuildSurvey

end

i want to test this class,so manually defined a test file which is like
following

require 'test_helper'
require 'build_survey'
class BuildSurveyTest < ActiveSupport::TestCase

end

but when i ran test,i got error like this:

  undefined method '<' nil:NilClass

i want to know how to test a non active_record class in models directory
in rails 3.can you help me?

hi
i have a non active_record class in models dir which is like following:

class BuildSurvey

end

i want to test this class,so manually defined a test file which is like
following

require 'test_helper'
require 'build_survey'
class BuildSurveyTest < ActiveSupport::TestCase

end

but when i ran test,i got error like this:

undefined method '<' nil:NilClass

i want to know how to test a non active_record class in models directory
in rails 3.can you help me?

You don't have to do anything beyond what you've shown (the require
build_survey is unnecessary)
You're going to have to show a little more (eg what does the
backtrace for that error look like?)

Fred

Frederick Cheung wrote in post #966198: