Browser console log capture in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Selenium Python code snippet capturing browser console logs?

Consider the following Selenium Python code that opens a page and captures browser console logs. What will be printed?

Selenium Python

from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.common.by import By

options = webdriver.ChromeOptions()
options.set_capability('goog:loggingPrefs', {'browser': 'ALL'})

service = Service()
driver = webdriver.Chrome(service=service, options=options)
driver.get('data:text/html,<script>console.log("Test log");console.error("Error log");</script>')
logs = driver.get_log('browser')
for entry in logs:
    print(entry['level'], entry['message'])
driver.quit()

A

INFO data:text/html,... "Error log"
SEVERE data:text/html,... "Test log"

B

DEBUG data:text/html,... "Test log"
ERROR data:text/html,... "Error log"

C

INFO data:text/html,... "Test log"
SEVERE data:text/html,... "Error log"

D No output because get_log('browser') returns empty list

💡 Hint

Browser console logs include levels like INFO and SEVERE for logs and errors respectively.

The console.log message appears with level INFO, and console.error appears with level SEVERE in Selenium browser logs.

❓ assertion

intermediate

Which assertion correctly verifies that a browser console log contains an error message?

You have captured browser logs in a variable named logs (a list of dicts). Which assertion correctly checks that at least one log entry contains the text 'TypeError'?

Selenium Python

logs = [{'level': 'SEVERE', 'message': 'Uncaught TypeError: undefined is not a function'}, {'level': 'INFO', 'message': 'Page loaded'}]

A assert logs['message'] == 'TypeError'

B assert any('TypeError' in entry['message'] for entry in logs)

C assert logs.contains('TypeError')

D assert 'TypeError' in logs

💡 Hint

You need to check inside each log message string, not the list or dict keys directly.

Option B correctly uses a generator expression to check if any log message contains 'TypeError'. Other options are invalid syntax or incorrect logic.

❓ locator

advanced

Which locator strategy is best to find the browser console log entries in Selenium Python?

You want to capture browser console logs using Selenium Python. Which method and argument correctly retrieves these logs?

A driver.get_console_logs()

B driver.get_log('console')

C driver.find_element(By.ID, 'browser_logs')

D driver.get_log('browser')

💡 Hint

Selenium WebDriver has a method to get logs by specifying the log type as a string.

The correct method is get_log with argument 'browser'. Other options are either invalid or do not exist.

🔧 Debug

advanced

Why does this Selenium Python code fail to capture browser console logs?

Given this code snippet, why does logs = driver.get_log('browser') return an empty list?

Selenium Python

from selenium import webdriver
options = webdriver.ChromeOptions()
driver = webdriver.Chrome(options=options)
driver.get('https://example.com')
logs = driver.get_log('browser')
print(logs)
driver.quit()

A Logging preferences were not set in ChromeOptions, so no logs are captured.

B The URL 'https://example.com' has no console logs, so empty list is expected.

C driver.get_log('browser') is deprecated and returns empty list.

D ChromeDriver does not support capturing browser logs.

💡 Hint

You must enable logging preferences explicitly in ChromeOptions to capture logs.

Without setting 'goog:loggingPrefs' capability in ChromeOptions, browser logs are not collected.

❓ framework

expert

How to integrate browser console log capture into a pytest Selenium test with assertion?

You want to write a pytest test that opens a page, captures browser console logs, and asserts no errors are present. Which code snippet correctly implements this?

A

def test_no_console_errors(driver):
    logs = driver.get_log('browser')
    errors = [entry for entry in logs if entry['level'] == 'SEVERE']
    assert not errors, f"Console errors found: {errors}"

B

def test_no_console_errors(driver):
    logs = driver.get_log('browser')
    assert all('error' not in entry['message'].lower() for entry in logs)

C

def test_no_console_errors(driver):
    logs = driver.get_log('console')
    assert 'SEVERE' not in logs

D

def test_no_console_errors(driver):
    logs = driver.get_log('browser')
    assert logs == []

💡 Hint

Filter logs by level 'SEVERE' and assert the list is empty for no errors.

Option A correctly filters logs by level and asserts no severe errors exist. Others either use wrong log type, wrong assertion, or incorrect logic.