What software testing is in Testing Fundamentals - Test Execution Trace

Test Overview

This test checks if the software testing process correctly identifies a simple bug in a calculator app by verifying the addition function works as expected.

Test Code - unittest

Testing Fundamentals

import unittest

class Calculator:
    def add(self, a, b):
        return a + b

class TestCalculator(unittest.TestCase):
    def test_addition(self):
        calc = Calculator()
        result = calc.add(2, 3)
        self.assertEqual(result, 5, "Addition result should be 5")

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

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Testing framework initializes the test runner	-	PASS
2	Creates Calculator instance	Calculator object ready for use	-	PASS
3	Calls add method with inputs 2 and 3	Calculator processes addition	-	PASS
4	Checks if result equals 5	Result is 5	self.assertEqual(result, 5)	PASS
5	Test ends	Test runner reports success	-	PASS

Failure Scenario

Failing Condition: The add method returns incorrect sum, e.g., 4 instead of 5

Execution Trace Quiz - 3 Questions

What does the test verify in this example?

A That the test framework runs without errors

B That the add method returns the correct sum

C That the Calculator class can be created

D That the add method returns a string

Key Result

Always write tests that check the expected behavior clearly, so bugs can be found early and fixed easily.