An Introduction to Unit Testing in Python

Unit testing is a software testing method where individual units of source code are tested to determine if they are fit for use. Python provides the unittest module for this purpose.

Creating a Test Case

import unittest

def add(a, b):
    return a + b

class TestAddFunction(unittest.TestCase):
    def test_add(self):
        self.assertEqual(add(2, 3), 5)

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

Running the Tests

Execute the script, and the tests will run automatically.

Common Assertions

• assertEqual(a, b)
• assertTrue(x)
• assertFalse(x)
• assertRaises(Exception, callable)

Conclusion

Unit testing ensures that individual components of your code work as intended. The unittest module provides a framework for writing and running tests.