class_docstr: Tests are in order with the design doc.
code: def test_safety_overwrite(self, safe1, safe2):
      # Safety
      model = generative_models.GenerativeModel(
          "gemini-m", safety_settings={"danger": "low"}
      )
  
      self.responses["generate_content"] = [
          simple_response(" world!"),
          simple_response(" world!"),
      ]
  
      _ = model.generate_content("hello")
      self.assertEqual(
          self.observed_requests[-1].safety_settings[0].category,
          glm.HarmCategory.HARM_CATEGORY_DANGEROUS_CONTENT,
      )
      self.assertEqual(
          self.observed_requests[-1].safety_settings[0].threshold,
          glm.SafetySetting.HarmBlockThreshold.BLOCK_LOW_AND_ABOVE,
      )
  
      _ = model.generate_content(
          "hello", safety_settings={"danger": "high"}
      )
      self.assertEqual(
          self.observed_requests[-1].safety_settings[0].category,
          glm.HarmCategory.HARM_CATEGORY_DANGEROUS_CONTENT,
      )
      self.assertEqual(
          self.observed_requests[-1].safety_settings[0].threshold,
          glm.SafetySetting.HarmBlockThreshold.BLOCK_ONLY_HIGH,
      )
  
imports: import collections
  from collections.abc import Iterable
  import copy
  import pathlib
  import unittest.mock
  from absl.testing import absltest
  from absl.testing import parameterized
  import google.ai.generativelanguage
  from google.generativeai import client
  from google.generativeai import generative_models
  from google.generativeai.types import content_types
  from google.generativeai.types import generation_types
  import PIL.Image
label_desc: Use image node_id 5 for calling the CUJTests obj's underlying member method code with example usage: obj.test_safety_overwrite(safe1, safe2) without return types