pytest with Selenium setup in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of pytest fixture with Selenium WebDriver

What will be the output when running this pytest test with the given fixture?

Selenium Python

import pytest
from selenium import webdriver

@pytest.fixture
async def driver():
    driver = webdriver.Firefox()
    yield driver
    driver.quit()

def test_title(driver):
    driver.get('https://example.com')
    assert 'Example Domain' in driver.title
    print('Test Passed')

A Test Passed printed and test passes

B SyntaxError due to async fixture

C Test Passed printed but test fails with AssertionError

D RuntimeError because driver.quit() is not called

💡 Hint

pytest fixtures should not be async unless using pytest-asyncio plugin

The fixture is declared async but webdriver.Firefox() is synchronous. pytest does not support async fixtures by default, causing a SyntaxError or runtime error.

❓ assertion

intermediate

Correct assertion for page title in Selenium test

Which assertion correctly verifies the page title contains 'Welcome' in a Selenium test using pytest?

Selenium Python

def test_page_title(driver):
    driver.get('https://mysite.com')
    # Choose the correct assertion below

A assert driver.title == 'Welcome to MySite'

B assert driver.title.index('Welcome') >= 0

C assert driver.title.contains('Welcome')

D assert 'Welcome' in driver.title

💡 Hint

Use Python's 'in' keyword to check substring presence

Option D uses Python's 'in' keyword correctly to check if 'Welcome' is part of the title string. Option D requires exact match, C and D are invalid syntax or cause errors.

❓ locator

advanced

Best locator strategy for a button with dynamic ID

You want to locate a button with a dynamic ID that changes every page load but has a stable class 'submit-btn' and visible text 'Submit'. Which locator is best for Selenium?

A driver.find_element('id', 'btn12345')

B driver.find_element('css selector', 'button.submit-btn')

C driver.find_element('xpath', "//button[contains(text(),'Submit') and contains(@class,'submit-btn')]")

D driver.find_element('name', 'submit')

💡 Hint

Use XPath to combine text and class attributes for stable selection

Option C uses XPath to find a button element containing the text 'Submit' and class 'submit-btn', which is stable despite dynamic IDs. Option C uses a dynamic ID which changes, B only uses class which may match multiple elements, D uses name which may not exist.

🔧 Debug

advanced

Identify the cause of flaky Selenium test failure

This pytest Selenium test intermittently fails with NoSuchElementException. What is the most likely cause?

Selenium Python

def test_login(driver):
    driver.get('https://mysite.com/login')
    driver.find_element('id', 'username').send_keys('user')
    driver.find_element('id', 'password').send_keys('pass')
    driver.find_element('id', 'submit').click()
    assert 'Dashboard' in driver.title

A The test runs too fast before page elements load; needs explicit wait

B The element IDs are incorrect and do not exist on the page

C The assertion is wrong; 'Dashboard' is not in the title

D driver.quit() is missing causing stale element errors

💡 Hint

Web pages may take time to load elements; Selenium needs waits

NoSuchElementException usually means Selenium tried to find an element before it appeared. Adding explicit waits or expected conditions solves this. Other options do not explain intermittent failure.

❓ framework

expert

pytest Selenium parallel test execution setup

Which pytest command correctly runs Selenium tests in parallel across 4 browser instances using pytest-xdist?

A pytest -n 4 --browser=firefox

B pytest --parallel=4 --browser=firefox

C pytest -n 4 --driver=firefox

D pytest --workers=4 --driver=firefox

💡 Hint

pytest-xdist uses -n option to specify number of parallel workers

Option A uses pytest-xdist's -n 4 to run tests in 4 parallel processes. The --browser option is commonly used in Selenium pytest setups to specify browser. Other options use invalid flags.