You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: subtractor_test.rb
    path of file: ./repos/rbs/test/rbs
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "test_helper"

class RBS::SubtractorTest < Test::Unit::TestCase
  def test_constants
  
    
  def test_constants_duplicated_with_class
    decls = to_decls(<<~RBS)
      C1: untyped
      C2: untyped
      C3: untyped
      C4: untyped
      C5: untyped
    RBS

    env = to_env(<<~RBS)
      class C1
      end