Python unittest returns “Ran 0 tests in 0.000s” and I have no idea why

Question

I'm stuck with this problem and I have no idea why this test doesn't work. Please anyone help me.

Code below is in the cityname.py file

def get_name(city, country):
    return (city.title() + ", " + country.title())

Code below is in the test_cities.py file

import unittest

from cityname import get_name

class CitiesTestCase(unittest.TestCase):

    def test_city_country(self):
        santiago_chile = get_name('santiago', 'chile')
        self.assertEqual(santiago_chile, 'Santiago, Chile')

unittest.main()

Here is the output

----------------------------------------------------------------------
Ran 0 tests in 0.000s

OK

Answer 1

1. Either remove unittest.main()
2. Or pass the argument exit=False , unittest.main(exit=False)

3. Or surround unittest.main( ) with this if statment

    if __name__ == '__main__': unittest.main()

Your can read more about how this works in the Python docs...https://docs.python.org/3.6/library/unittest.html#unittest.main

Answer 2

In my case, it's that I have both python2 and python3 installed, and "python" refers to py2. "python -m unittest -v" always return "Ran 0 test" which is fixed by "python3 -m unittest -v"