class Shoulda::Matchers::ActiveModel::ValidatePresenceOfMatcher

def example_of_belongs_to(with: nil)
  initial_call = "should belong_to(:#{association_name})"
  inside =
    if with
      "#{initial_call}.#{with.first}(#{with.second})"
    else
      initial_call
    end
  if Shoulda::Matchers.integrations.test_frameworks.any?(&:n_unit?)
    inside
  else
    "it { #{inside} }"
  end
end