How to use Python unit test module and it's methods?

Unit test module is an in-build library in python, used to write test scripts . It gives some helpful methods while helps us designing out test in a way , that emulates a real production environment.

While writing test, we need to keep these things in mind

1. Test should start with a clean slate. Meaning the subject under test must not hold any info or be in a state, that might affect the test results.

2. Every tests should test one and only one feature . Clubbing multiple tests in one test,  is a bad idea.

Unit test provides some special methods. These can be used to handle the flow of tests as per scenario. Below is a generic template of a unit test showing all methods and their tasks.

import unittest

def setUpModule():
    print '------------SET UP MODULE--------------'
    print '\nImport something here. Example configs \n'

def tearDownModule():
    print '------------TEAR DOWN MODULE--------------'
    print 'Destroy whatever you did in setUpModule \n'

class MyTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        # cls is just a convention. It can be anything
        print '------------SET UP CLASS--------------'
        print 'Created something here'
        print '------------END----------------\n'

    @classmethod
    def tearDownClass(cls):
        print '------------TEAR DOWN CLASS--------------'
        print 'Remove whatever was created in setupclass'
        print '-------------END----------------\n'


    def setUp(self):
        print '------------SETUP--------------'
        print 'Connect to above created thing'
        print '------------END----------------\n'

    def tearDown(self):
        print '------------TEAR DOWN--------------'
        print 'Disconnect to above created thing'
        print '------------END----------------\n'

    def test_func1(self):
        print '------------TEST 1--------------'
        print 'Test function one here'
        print '------------END----------------\n'

    def test_func2(self):
        print '------------TEST 2--------------'
        print 'Test function two here'
        print '------------END----------------\n'

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

If we run the above test , the results are as follows :

D:\myusername\Desktop\PyJobs>python -m unittest test_unittest_all_examples

------------SET UP MODULE--------------

Import something here. Example configs

------------SET UP CLASS--------------
Created something here
------------END----------------

------------SETUP--------------
Connect to above created thing
------------END----------------

------------TEST 1--------------
Test function one here
------------END----------------

------------TEAR DOWN--------------
Disconnect to above created thing
------------END----------------

.------------SETUP--------------
Connect to above created thing
------------END----------------

------------TEST 2--------------
Test function two here
------------END----------------

------------TEAR DOWN--------------
Disconnect to above created thing
------------END----------------

.------------TEAR DOWN CLASS--------------
Remove whatever was created in setupclass
-------------END----------------

------------TEAR DOWN MODULE--------------
Destroy whatever you did in setUpModule


----------------------------------------------------------------------
Ran 2 tests in 0.004s

OK