Test classes in PyTest - Test Execution Trace

Test Overview

This test class groups two simple tests that check basic math operations. It verifies that addition and multiplication work as expected.

Test Code - pytest

PyTest

import pytest

class TestMathOperations:
    def test_addition(self):
        result = 2 + 3
        assert result == 5

    def test_multiplication(self):
        result = 4 * 5
        assert result == 20

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Pytest starts and discovers the test class TestMathOperations	Test runner is ready to execute tests	-	PASS
2	Pytest runs test_addition method	Inside test_addition, result is calculated as 2 + 3	Assert that result == 5	PASS
3	Pytest runs test_multiplication method	Inside test_multiplication, result is calculated as 4 * 5	Assert that result == 20	PASS
4	Pytest finishes running all tests in TestMathOperations	All tests passed	-	PASS

Failure Scenario

Failing Condition: If the assertion in test_addition fails because result is not 5

Execution Trace Quiz - 3 Questions

What does the test_addition method verify?

A That 2 minus 3 equals -1

B That 2 plus 3 equals 5

C That 4 times 5 equals 20

D That 5 divided by 2 equals 2.5

Key Result

Using test classes helps organize related tests, making the test suite easier to read and maintain.