Minitest mock method question

my_class.rb

class MyClass
  # How do I test #run without actually invoking `do_thing1` and `do_thing2`?
  # I'd like to mock them. But Minitest only allows stubbing entire objects,
  # so I can't mock the methods without changing the object under test.
  def run
    do_thing1
    do_thing2
  end
  
  def do_thing1
    sleep 1
    puts 'thing1'
  end

  def do_thing2
    sleep 1
    puts 'thing2'
  end
end