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_win32ole_type.rb
    path of file: ./repos/ruby/test/win32ole
    
    the code of the file until where you have to start completion: # frozen_string_literal
    
    def test_variables
      variables = @ole_type.variables
      assert_instance_of(Array, variables)
      assert(variables.size == 0)

      ole_type = WIN32OLE::Type.new("Microsoft Shell Controls And Automation", "ShellSpecialFolderConstants")
      variables = ole_type.variables
      assert_instance_of(Array, variables)
      assert(variables.size > 0)

      assert_instance_of(WIN32OLE::Variable, variables[0])
    end