input: Write a function to generate a list of 10 unique random integers between 1 and 1000.
  assert len(set(generate_random_ints())) == 10
  assert all(1 <= num <= 1000 for num in generate_random_ints())
output: import random
  
  def generate_random_ints():
      return random.sample(range(1, 1001), 10)