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_ext_cargo_builder_unit.rb
    path of file: ./repos/ruby/test/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "helper"
require "rubygems/ext"

class TestGemExtCargoBuilderUnit < Gem::TestCase
  def test_cargo_command_passes_args
    skip_unsupporte
    
  def test_cargo_command_passes_respects_cargo_env_var
    skip_unsupported_platforms!
    old_cargo = ENV["CARGO"]
    ENV["CARGO"] = "mycargo"
    builder = Gem::Ext::CargoBuilder.new
    command = builder.cargo_command(Dir.pwd, @tempdir)

    assert_includes command, "mycargo"
  ensure
    ENV["CARGO"] = old_cargo
  end