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_event.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/win32ole
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
begin
  require 'win32ole'
rescue LoadError
end
require 'test/unit'

ado_installed =
 
    
      def test_on_event_hash_return2
        ev = WIN32OLE_EVENT.new(@db)
        ev.on_event('WillConnect'){|*args|
          {:ConnectionString => CONNSTR}
        }
        @db.connectionString = 'XXX'
        @db.open
        assert(true)
      end