Always write unit test cases in a file which starts with test_something.py

To run a test write on terminal

python -m unittest test_something.py

in class test_something.py define a class and inherit from unittest.TestCase class ClassName(object):
	"""docstring for ClassName"""
	def __init__(self, arg):
		super(ClassName, self).__init__()
		self.arg = arg


write the main function in the file

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

and then run

python test_something.py

both will give some result like:

Ran 1 test in 0.000s

write all function names like test_something otherwise that test function will not run


setUp()
and
tearDown() methods run before and after of each test if defined


to run something before every test case
and to run something after every test case run:

setUpClass
and tearDownClass classmethod


from unittest.mock import patch

use patch as derocator or context manager