Log level filtering in PyTest - Test Execution Trace

Test Overview

This test checks that only log messages at or above the WARNING level are captured during test execution. It verifies that INFO level messages are filtered out and do not appear in the captured logs.

Test Code - pytest

PyTest

import logging
import pytest

def test_log_level_filtering(caplog):
    caplog.set_level(logging.WARNING)
    logging.getLogger().info("This is an info message")
    logging.getLogger().warning("This is a warning message")
    assert "This is an info message" not in caplog.text
    assert "This is a warning message" in caplog.text

Execution Trace - 6 Steps

Step	Action	System State	Assertion	Result
1	Test starts	pytest test runner initialized	-	PASS
2	caplog fixture sets log capture level to WARNING	Logging system configured to capture WARNING and above	-	PASS
3	Logger emits INFO level message: 'This is an info message'	INFO message generated but below capture level	-	PASS
4	Logger emits WARNING level message: 'This is a warning message'	WARNING message generated and captured	-	PASS
5	Assert INFO message is not in captured logs	Captured logs do not contain INFO message	assert "This is an info message" not in caplog.text	PASS
6	Assert WARNING message is in captured logs	Captured logs contain WARNING message	assert "This is a warning message" in caplog.text	PASS

Failure Scenario

Failing Condition: caplog does not filter out INFO messages or fails to capture WARNING messages

Execution Trace Quiz - 3 Questions

What log level is set for capturing logs in this test?

A ERROR

B INFO

C WARNING

D DEBUG

Key Result

Always set the log capture level explicitly in tests to filter out unwanted log messages and verify only relevant logs appear.