WebDriver setup (ChromeDriver, GeckoDriver) in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Selenium WebDriver setup code?

Consider the following Python code snippet that sets up a Chrome WebDriver and opens a webpage. What will be printed after execution?

Selenium Python

from selenium import webdriver
from selenium.webdriver.chrome.service import Service

service = Service(executable_path='/path/to/chromedriver')
driver = webdriver.Chrome(service=service)
driver.get('https://example.com')
print(driver.title)
driver.quit()

A Example Domain

B ChromeDriver

C https://example.com

D selenium.common.exceptions.WebDriverException

💡 Hint

The driver.title returns the title of the current page loaded by the browser.

The code opens 'https://example.com' in Chrome and prints the page title, which is 'Example Domain'.

❓ assertion

intermediate

Which assertion correctly verifies the page title after WebDriver opens a page?

You want to check that the page title is exactly 'Welcome Page' after opening a URL with Selenium WebDriver in Python. Which assertion is correct?

Selenium Python

from selenium import webdriver
from selenium.webdriver.chrome.service import Service

service = Service(executable_path='/path/to/chromedriver')
driver = webdriver.Chrome(service=service)
driver.get('https://example.com/welcome')
# Which assertion below is correct?

A assert driver.title != 'Welcome Page'

B assert driver.title == 'Welcome Page'

C assert 'Welcome Page' in driver.current_url

D assert driver.page_source == 'Welcome Page'

💡 Hint

The page title is accessed by driver.title, not current_url or page_source.

To verify the page title, use assert driver.title == 'Welcome Page'. Other options check wrong properties.

🔧 Debug

advanced

Why does this GeckoDriver setup code raise an error?

This Python code tries to start Firefox WebDriver but raises an error. Identify the cause.

Selenium Python

from selenium import webdriver
from selenium.webdriver.firefox.service import Service

service = Service('/path/to/geckodriver')
driver = webdriver.Firefox(service=service)
driver.get('https://example.com')
driver.quit()

A Firefox browser is not installed on the system

B The Service class is not imported from selenium.webdriver.firefox.service

C The path to geckodriver is incorrect or missing execute permission

D driver.get() method is deprecated and causes error

💡 Hint

Check if the geckodriver executable path is valid and accessible.

If geckodriver path is wrong or lacks execute permission, WebDriver raises an error on startup.

❓ locator

advanced

Which locator strategy is best for stable element selection in Selenium?

You want to select a button element that has a unique id 'submit-btn' on a webpage. Which locator is best practice for stability and speed?

A driver.find_element('id', 'submit-btn')

B driver.find_element('xpath', '//button[@id="submit-btn"]')

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

D driver.find_element('class name', 'submit-btn')

💡 Hint

Using id locator is usually fastest and most reliable if id is unique.

Locating by id is preferred for unique elements because it is fast and less brittle than xpath or css selectors.

❓ framework

expert

What is the correct way to initialize ChromeDriver with options in Selenium Python?

You want to start ChromeDriver with headless mode enabled and disable GPU usage. Which code snippet correctly sets this up?

A

from selenium import webdriver
from selenium.webdriver.chrome.service import Service

service = Service('/path/to/chromedriver')
driver = webdriver.Chrome(service=service)
driver.add_argument('--headless')
driver.add_argument('--disable-gpu')
driver.get('https://example.com')

B

from selenium import webdriver
options = webdriver.ChromeOptions()
options.headless = True
options.disable_gpu = True
driver = webdriver.Chrome(options=options)
driver.get('https://example.com')

C

from selenium import webdriver
from selenium.webdriver.chrome.options import Options

options = Options()
options.set_headless(True)
options.set_disable_gpu(True)
driver = webdriver.Chrome(options=options)
driver.get('https://example.com')

D

from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.chrome.options import Options

options = Options()
options.add_argument('--headless')
options.add_argument('--disable-gpu')
service = Service('/path/to/chromedriver')
driver = webdriver.Chrome(service=service, options=options)
driver.get('https://example.com')

💡 Hint

Options must be created and passed to the driver constructor before starting the browser.

Option D correctly creates Options, adds arguments, creates Service, and passes both to Chrome constructor.

Practice

1. What is the main purpose of using ChromeDriver or GeckoDriver in Selenium Python?

easy

A. To connect Selenium scripts with the browser for automation

B. To write test cases in Python

C. To create HTML reports of test results

D. To manage database connections during tests

Solution

1. Step 1: Understand WebDriver role

   WebDriver acts as a bridge between Selenium scripts and the browser.

2. Step 2: Identify driver purpose

   ChromeDriver and GeckoDriver are specific drivers to control Chrome and Firefox browsers respectively.

3. Final Answer:

   To connect Selenium scripts with the browser for automation -> Option A

4. Quick Check:

   Driver connects Selenium to browser = B [OK]

Hint: Drivers link Selenium to browsers for automation [OK]

Common Mistakes:

• Thinking drivers write test cases
• Confusing drivers with reporting tools
• Assuming drivers manage databases

2. Which of the following is the correct way to import and set up ChromeDriver using Selenium 4+ in Python?

easy

A. from selenium import webdriver
from selenium.webdriver.chrome.service import Service
service = Service('path/to/chromedriver')
driver = webdriver.Chrome(service=service)

B. import webdriver
driver = webdriver.Chrome('path/to/chromedriver')

C. from selenium.webdriver import ChromeDriver
service = ChromeDriver('path/to/chromedriver')
driver = webdriver.Chrome(service)

D. from selenium import webdriver
service = webdriver.Chrome('path/to/chromedriver')
driver = webdriver.Chrome(service)

Solution

1. Step 1: Check import statements

   Correct import for Service class is from selenium.webdriver.chrome.service import Service.

2. Step 2: Verify driver initialization

   Driver must be created with webdriver.Chrome(service=service) passing the Service object.

3. Final Answer:

   from selenium import webdriver from selenium.webdriver.chrome.service import Service service = Service('path/to/chromedriver') driver = webdriver.Chrome(service=service) -> Option A

4. Quick Check:

   Use Service class and pass to Chrome() = A [OK]

Hint: Use Service class and pass it to Chrome() constructor [OK]

Common Mistakes:

• Passing driver path directly to Chrome() without Service
• Wrong import paths for Service
• Using incorrect class names like ChromeDriver

3. What will happen if you run this code snippet?

from selenium import webdriver
from selenium.webdriver.chrome.service import Service
service = Service('wrong/path/chromedriver')
driver = webdriver.Chrome(service=service)
driver.get('https://example.com')

medium

A. The browser opens and loads the page successfully

B. The driver automatically downloads the correct ChromeDriver

C. A FileNotFoundError or WebDriverException is raised due to wrong driver path

D. The code runs but the page does not load

Solution

1. Step 1: Analyze driver path usage

   Service is given a wrong path to ChromeDriver executable.

2. Step 2: Understand error on invalid path

   Selenium cannot find the driver file, so it raises an error like FileNotFoundError or WebDriverException.

3. Final Answer:

   A FileNotFoundError or WebDriverException is raised due to wrong driver path -> Option C

4. Quick Check:

   Wrong driver path causes error = D [OK]

Hint: Wrong driver path causes immediate error [OK]

Common Mistakes:

• Assuming driver auto-downloads
• Expecting browser to open without driver
• Thinking code runs but page stays blank

4. Identify the error in this GeckoDriver setup code and choose the correct fix:

from selenium import webdriver
service = Service('path/to/geckodriver')
driver = webdriver.Firefox(service=service)
driver.get('https://example.com')

medium

A. webdriver.Firefox() does not accept service parameter

B. Missing import of Service class from selenium.webdriver.firefox.service

C. Incorrect driver path format, should use double backslashes

D. driver.get() should be called before creating driver

Solution

1. Step 1: Check imports

   Service class for Firefox must be imported from selenium.webdriver.firefox.service.

2. Step 2: Verify usage

   Without importing Service, the code will raise NameError or similar.

3. Final Answer:

   Missing import of Service class from selenium.webdriver.firefox.service -> Option B

4. Quick Check:

   Import Service for Firefox driver = C [OK]

Hint: Always import Service class for the browser driver used [OK]

Common Mistakes:

• Not importing Service class
• Wrong path format causing silent failure
• Calling driver.get() before driver creation

5. You want to run Selenium tests on Firefox but your Firefox browser updated to version 115. Which is the best practice to ensure your GeckoDriver setup works correctly?

hard

A. Remove the Service class and pass the driver path directly to webdriver.Firefox()

B. Use the existing GeckoDriver without changes; Selenium handles compatibility automatically

C. Switch to ChromeDriver since GeckoDriver does not support Firefox 115

D. Download the GeckoDriver version compatible with Firefox 115 and update the Service path accordingly

Solution

1. Step 1: Understand driver-browser compatibility

   GeckoDriver must match the Firefox browser version to work properly.

2. Step 2: Apply best practice for updates

   Download the correct GeckoDriver version for Firefox 115 and update your code to use its path.

3. Final Answer:

   Download the GeckoDriver version compatible with Firefox 115 and update the Service path accordingly -> Option D

4. Quick Check:

   Match driver version with browser version = A [OK]

Hint: Always match driver version with browser version [OK]

Common Mistakes:

• Assuming Selenium auto-updates drivers
• Switching browsers unnecessarily
• Passing driver path without Service class