Python运行测试代码，没有显示结果

使用pycharm测试代码没有结果，请问代码哪里有误？

代码如下
test中的代码：

def city_and_country(city,country):
    return f"{city},{country}"

printing_functions中的代码：

from test import city_and_country
import unittest
class NameTestCase(unittest.TestCase):
    """测试test.py"""
    def test_city_country(self):
        city = 'santiago'
        country = 'chile'
        name = city_and_country(city,country)
        self.assertEqual(name,'santiago,chile')

if __name__ == '__printing_functions__':
    unittest.printing_functions()

运行结果

Process finished with exit code 0

求解答，感激不尽~

if __name__ == '__main__':