Title: Test If Output Is Close To A Value
Slug: test_if_an_output_is_close_to_a_value
Summary: Test if an output is close to a value in Python. Date: 2016-01-23 12:00
Category: Python
Tags: Testing
Authors: Chris Albon

Interesting in learning more? Here are some good books on unit testing in Python: Python Testing: Beginner's Guide and Python Testing Cookbook.

Preliminaries



In [1]:

    
import unittest
import sys

Create Function To Be Tested



In [2]:

    
def add(x, y):
    return x + y

Create Test



In [3]:

    
# Create a test case
class TestAdd(unittest.TestCase):
    # Create the unit test
    def test_add_two_floats_roughly_equals_11(self):
        # Test if add(4.48293848, 6.5023845) return roughly (to 1 place) 11 (actual product: 10.98532298)
        self.assertAlmostEqual(11, add(4.48293848, 6.5023845), places=1)

Run Test



In [4]:

    
# Run the unit test (and don't shut down the Jupyter Notebook)
unittest.main(argv=['ignored', '-v'], exit=False)









    



test_add_two_floats_roughly_equals_11 (__main__.TestAdd) ... ok

----------------------------------------------------------------------
Ran 1 test in 0.001s

OK






    Out[4]:





<unittest.main.TestProgram at 0x1049191d0>