unittesting a function in different file in python

Question

I'm trying to test an add function that excites in calc.py

import unittest
import calc
class TestCalc(unittest.TestCase):
    
    def test_add(self):
        result = calc.add(10,5)
        self.assertEqual(result,15)

My question is what does self means in this example

I know that self is an instance of a class.But, can you give me an example of what the value of self would be in my example.

Is this not covered in the unittest documentation?

AMC
– AMC

2020-06-26 01:34:53 +00:00
Commented Jun 26, 2020 at 1:34 — AMC
– AMC, Commented Jun 26, 2020 at 1:34

Clément Mangin · Accepted Answer · 2020-06-26 00:07:21Z

1

self is a reference to the instance of TestCalc that is instantiated by the test runner from unittest when you run your tests.

More generally, when an object is instantiated and one of its methods is called (such as test_add(), called by unittest's test runner in your case), self is used to refer to the instance the method is called on, allowing access to its other properties and methods (such as assertEqual(), inherited from unittest.TestCase, in your case).

answered Jun 26, 2020 at 0:07

Clément Mangin

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2 Comments

Mustafa Albairmani Over a year ago

You said (the instance the method is called on) It means that self refers to unites.TestCase in my example right? Thank you

Clément Mangin Over a year ago

No, it refers to an instance of your class TestCalc, which is a subclass of unittest.TestCase. I think you need object-oriented programming lessons.

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