Running tests (pytest command) - Test Execution Trace

Test Overview

This test runs a simple function test using the pytest command. It verifies that the function returns the expected result.

Test Code - pytest

PyTest

import pytest

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

def test_add():
    assert add(2, 3) == 5

Execution Trace - 3 Steps

Step	Action	System State	Assertion	Result
1	Test runner starts and discovers test functions in the file	Terminal shows pytest starting and collecting tests	-	PASS
2	pytest runs the test_add function	Function add(2, 3) is called and returns 5	Check if add(2, 3) == 5	PASS
3	pytest reports test result	Terminal shows one test passed	Test passed confirmation	PASS

Failure Scenario

Failing Condition: The add function returns a wrong result, e.g., add(2, 3) returns 4

Execution Trace Quiz - 3 Questions

What does pytest do first when you run the pytest command?

A It immediately runs all functions

B It discovers test functions in the file

C It compiles the code

D It opens a browser

Key Result

Always verify that your test assertions match the expected output exactly to catch errors early.