python - Code runs while unit testing -

i'm trying unit test minesweeper game made in python. starting small 1 test on 1 definition, runs entire code of should testing minor part. unit testing code:

import unittest minesweeper import setupgrid  class testmyfunctions(unittest.testcase):     def test_setup(self):         self.asserttrue(setupgrid(9, [], 10))   if __name__ == '__main__' :     unittest.main(exit=false) 

and function should checking:

import random, re, time string import ascii_lowercase   def setupgrid(gridsize, start, numberofmines):     emptygrid = [['0' in range(gridsize)] in range(gridsize)]     mines = getmines(emptygrid, start, numberofmines)     i, j in mines:         emptygrid[i][j] = 'x'     grid = getnumbers(emptygrid)     return (grid, mines) 

the default values emptygrid , numberofmines are, respectively, 9 , 10 , value start should empty, hence [].