Test file and function naming conventions in PyTest - Test Execution Trace

Test Overview

This test checks that pytest recognizes test files and test functions based on proper naming conventions. It verifies that a test function named with the prefix test_ inside a file named with the prefix test_ is discovered and executed by pytest.

Test Code - PyTest

PyTest

import pytest

def test_addition():
    assert 2 + 3 == 5

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Pytest starts and scans the current directory for test files matching pattern 'test_*.py' or '*_test.py'.	Test file named 'test_example.py' is present with the test function inside.	-	PASS
2	Pytest loads 'test_example.py' and discovers the function 'test_addition' because it starts with 'test_'.	Test function 'test_addition' is ready to run.	-	PASS
3	Pytest executes the function 'test_addition'.	Inside the test function, the expression 2 + 3 == 5 is evaluated.	Assert that 2 + 3 equals 5.	PASS
4	Pytest reports the test result as passed.	Test run completes successfully with no failures.	-	PASS

Failure Scenario

Failing Condition: Test function or file does not follow pytest naming conventions (e.g., function not starting with 'test_').

Execution Trace Quiz - 3 Questions

Why does pytest not run a function named 'addition_test' inside 'test_example.py'?

A Because the file name does not start with 'test_'.

B Because the function name does not start with 'test_'.

C Because pytest only runs functions inside classes.

D Because the function is missing an assert statement.

Key Result

Following pytest's naming conventions for test files and functions is essential for automatic test discovery and execution.