Testing is the process of knowing whether the code is successfully executed or not. In Python there is a inbuilt module unittest, which give us whether the Test condition is True or false.
Unit test
The test condition should be written as a separate program. The name of the program should be either test_filename.py or filename_test.py. Let’s write a program to find square of a number.
Save the file name as Square.py
def sq(n):
return n*n
Test code
To write the test code, first we want to import unittest module which is a inbuilt module.
import unittest
from square import sq
Class Testing (unittest.TestCase):
def test_sq(self):
r = sq(5)
self.assertEqual(r, 25)
Thus when we execute the text file, the output will be.
————————————————–
Ran test 1 in 0.00s
OK
Assert functions
Python has many inbuilt functions to test the functions. One of it is assert function. There are many functions like assertTrue, assertFalse, assertEqual, assertNotEqual and so on.
Testing Exception
Exception can be handled in Python using assertRaises function. In case of division by zero, we can raise the exception by.
self.assertRaises(ZeroDivisionError, Divnum, 0)
Test Coverage
Test Coverage method is used to detect untested part of the code. We can install it by simply typing
pip install coverage
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