Testing and project · Lesson 24 of 25

Testing and project setup

Normal cases, boundaries, expected errors and an isolated environment.

8 minutes1 games

Split your program into small functions and test known inputs: a normal case, a boundary and invalid input. unittest is in the standard library. Locally create an environment with python -m venv .venv and install dependencies with python -m pip after activating it. These terminal commands do not belong in this Python editor.

Python

import unittest

def is_even(n):
    return n % 2 == 0

class TestEven(unittest.TestCase):
    def test_even(self):
        self.assertTrue(is_even(4))

    def test_zero(self):
        self.assertTrue(is_even(0))

    def test_odd(self):
        self.assertFalse(is_even(3))

result = unittest.TestResult()
unittest.defaultTestLoader.loadTestsFromTestCase(TestEven).run(result)
print(result.testsRun, result.wasSuccessful())

Tool	Use
حالة عادية / Normal	An even number: 4
حد فاصل / Boundary	Zero
حالة عكسية / Opposite	An odd number: 3

Exercise

Implement safe_divide: return None for a zero divisor, otherwise divide. Print both cases.

Expected output:

3.0
None

Python

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Python

Testing and project · Lesson 24 of 25

Testing and project setup

Normal cases, boundaries, expected errors and an isolated environment.

8 minutes1 games

Python

import unittest

def is_even(n):
    return n % 2 == 0

class TestEven(unittest.TestCase):
    def test_even(self):
        self.assertTrue(is_even(4))

    def test_zero(self):
        self.assertTrue(is_even(0))

    def test_odd(self):
        self.assertFalse(is_even(3))

result = unittest.TestResult()
unittest.defaultTestLoader.loadTestsFromTestCase(TestEven).run(result)
print(result.testsRun, result.wasSuccessful())

Tool	Use
حالة عادية / Normal	An even number: 4
حد فاصل / Boundary	Zero
حالة عكسية / Opposite	An odd number: 3

Exercise

Implement safe_divide: return None for a zero divisor, otherwise divide. Print both cases.

Expected output:

3.0
None

Python

Learn more from

Played 0 of 1 games