Testing modules

I'm curious about standards on unit testing modules.

I have a module file in my lib/ directory. Should I create a unit test
in test/unit directory and test it as I would any other model?

Is there any kind of naming convention used for unit test files for
modules (some_name_test.rb or some_name_module_test.rb)?

I'm curious about standards on unit testing modules.

I have a module file in my lib/ directory. Should I create a unit test
in test/unit directory and test it as I would any other model?

Don't know if there's a standard but I think it makes sense just to
test
it in test/unit.

Is there any kind of naming convention used for unit test files for
modules (some_name_test.rb or some_name_module_test.rb)?

Don't know. If it's lib/some_name.rb then test/unit/
some_name_test.rb
seems ok with contents:
  require File.dirname(__FILE__) + '/../test_helper'
  class SomeNameTest < Test::Unit::TestCase
  ...
  end
Works for me at the moment.