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: test_gem_resolver_composed_set.rb
    path of file: ./repos/jruby/test/mri/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require_relative 'helper'

class TestGemResolverComposedSet < Gem::TestCase
  def test_errors
    index_set   = Gem::Resolver::IndexSet.new
    current_set = Gem::Resolver::CurrentSet
    
  def test_prerelease_equals
    best_set    = Gem::Resolver::BestSet.new
    current_set = Gem::Resolver::CurrentSet.new

    set = Gem::Resolver::ComposedSet.new best_set, current_set

    set.prerelease = true

    assert set.prerelease
    assert best_set.prerelease
    assert current_set.prerelease
  end