```ruby
require "test_helper"

class CaseStudyTest < ActiveSupport::TestCase
  include DocumentBehaviour
  include ActionDispatch::TestProcess

  test "should be able to relate to policies" do
    article = build(:case_study)
    assert article.can_be_related_to_policies?
  end

  # test "#topics includes topics associated with related published policies" do
  #   related_policy = create(:published_policy, topics: [create(:topic), create(:topic)])
  #   news_article = create(:news_article, related_policies: [related_policy])
  #   assert_equal related_policy.topics.sort, news_article.topics.sort
  # end

  # test "#topics excludes topics associated with related unpublished policies" do
  #   related_policy = create(:draft_policy, topics: [create(:topic), create(:topic)])
  #   news_article = create(:case_study, related_policies: [related_policy])
  #   assert_equal [], news_article.topics
  # end

  # test "#topics includes each related topic only once, even if associated multiple times" do
  #   topic = create(:topic)
  #   first_related_policy = create(:published_policy, topics: [topic])
  #   second_related_policy = create(:published_policy, topics: [topic])
  #   news_article = create(:news_article, related_policies: [first_related_policy, second_related_policy])
  #   assert_equal [topic], news_article.topics
  # end

end
```

Remove useless commented out tests
user
```ruby
require "test_helper"

class CaseStudyTest < ActiveSupport::TestCase
  include DocumentBehaviour
  include ActionDispatch::TestProcess

  test "should be able to relate to policies" do
    article = build(:case_study)
    assert article.can_be_related_to_policies?
  end

end
```
assistant