# ...

  context "for a given user" do
    setup do
      topic.user = User.create(:name => "acme", :email => "a@b.com",
        :password => "h3ll0", :password_confirmation => "h3ll0")
      topic.description = "Foo Bar"
      topic.name = "foo_bar"
      topic.save!
      topic
    end

    topic.validates_uniqueness_of :name

  end.delete_all(User)

  # ...