unittest discover 无法找到测试文件,因为一个模块内全局变量??

楼主非专业 python 开发,今天遇到个完全没头脑的问题,请赐教!.

• 今天 unittest 单元测试一直找不到测试文件,一行一行排查.
• 结果居然是使用 geoip2.database 模块内一个全局变量 read = geoip2.database.Reader(geoipfile)
• 只要有这个全局变量,测试文件就找不到,geoipfile 没影响...这是咋回事啊??😵😵😵...

test_ip.py

import unittest

from .geoip import location

class Test_lib(unittest.TestCase):
    def test_locations(self):
        ips = ['23.250.80.1', '24.199.128.3', '31.173.152.1', '186.115.160.2']
        adds = locations(ips)
        self.assertEqual(len(adds), 4)

geoip.py

#!/usr/bin/python3

import geoip2.database, logging

geoipfile = "./GeoLite2-City.mmdb"
read = geoip2.database.Reader(geoipfile)

def locations(ips: list[str]) -> list:

    s = location()
    next(s)
    return [s.send(x) for x in ips]


def location() -> list:
    ip = "1.0.0.1"
    while True:
        try:
            response = read.city(ip)
            a = [ip, response.location.longitude, response.location.latitude]
        except Exception as e:
            logging.exception(e)
            a = []
        ip = yield a