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_source_vendor.rb
    path of file: ./repos/truffleruby/test/mri/tests/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require_relative "helper"
require "rubygems/source"

class TestGemSourceVendor < Gem::TestCase
  def test_initialize
    source = Gem::Source::Vendor.new "vendor/foo"

    assert_eq
    
  def test_spaceship
    vendor    = Gem::Source::Vendor.new "vendor/foo"
    remote    = Gem::Source.new @gem_repo
    git       = Gem::Source::Git.new "a", "a", nil
    installed = Gem::Source::Installed.new

    assert_equal(0, vendor.<=>(vendor),    "vendor <=> vendor")

    assert_equal(1, vendor.<=>(remote),    "vendor <=> remote")
    assert_equal(-1, remote.<=>(vendor), "remote <=> vendor")

    assert_equal(1, vendor.<=>(git), "vendor <=> git")
    assert_equal(-1, git.<=>(vendor), "git <=> vendor")

    assert_equal(1, vendor.<=>(installed), "vendor <=> installed")
    assert_equal(-1, installed.<=>(vendor), "installed <=> vendor")
  end