如何从这个Json中提取所有的值来进行断言？

import json

def extract_values(json_obj):
    values = []
    if isinstance(json_obj, dict):
        for key, value in json_obj.items():
            if isinstance(value, (dict, list)):
                values.extend(extract_values(value))
            else:
                values.append(value)
    elif isinstance(json_obj, list):
        for item in json_obj:
            values.extend(extract_values(item))
    return values

# 给定的JSON字符串
json_str = '''
{
  "name": "John",
  "age": 30,
  "city": "New York",
  "pets": [
    {
      "name": "Max",
      "type": "dog"
    },
    {
      "name": "Lucy",
      "type": "cat"
    }
  ]
}
'''

# 解析JSON
json_obj = json.loads(json_str)

# 提取所有的值并断言
all_values = extract_values(json_obj)
expected_values = ["John", 30, "New York", "Max", "dog", "Lucy", "cat"]

assert all(value in all_values for value in expected_values)