Cloud testing platforms (BrowserStack, Sauce Labs) in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this BrowserStack Selenium test snippet?

Consider this Python Selenium code snippet configured to run on BrowserStack. What will be printed after execution?

Selenium Python

from selenium import webdriver
from selenium.webdriver.common.by import By

caps = {
    'browserName': 'Chrome',
    'browserVersion': 'latest',
    'bstack:options': {
        'os': 'Windows',
        'osVersion': '11',
        'projectName': 'Sample Project'
    }
}

url = 'https://hub-cloud.browserstack.com/wd/hub'

options = webdriver.ChromeOptions()
options.set_capability('bstack:options', caps['bstack:options'])
options.set_capability('browserName', caps['browserName'])
options.set_capability('browserVersion', caps['browserVersion'])

# Normally username and access key are required, but omitted here for simplicity

driver = webdriver.Remote(
    command_executor=url,
    options=options
)

driver.get('https://example.com')
heading = driver.find_element(By.TAG_NAME, 'h1').text
print(heading)
driver.quit()

A Empty string

B NoSuchElementException error

C SyntaxError

D Example Domain

💡 Hint

Think about what the main heading on https://example.com is.

The code navigates to https://example.com and finds the first

tag. The text inside that tag is 'Example Domain'. So the print statement outputs 'Example Domain'.

❓ assertion

intermediate

Which assertion correctly verifies Sauce Labs test status?

You want to assert that a Sauce Labs test session has passed by checking the session status via their REST API. Which Python assertion is correct?

Selenium Python

import requests

session_id = 'abc123'
url = f'https://saucelabs.com/rest/v1/user/jobs/{session_id}'
response = requests.get(url, auth=('username', 'access_key'))
data = response.json()

# Which assertion below correctly checks the test passed?

A assert data['consolidated_status'] == 'passed'

B assert data['status'] == 'passed'

C assert data['passed'] is True

D assert data['result'] == 'success'

💡 Hint

Check Sauce Labs API documentation for the correct status field name.

The Sauce Labs REST API returns 'consolidated_status' as the key indicating pass/fail status. The value 'passed' means the test passed.

❓ locator

advanced

Which locator is best for cross-browser cloud testing?

When writing Selenium tests to run on cloud platforms like BrowserStack and Sauce Labs, which locator strategy is most reliable across different browsers and screen sizes?

A By.CSS_SELECTOR with complex nested selectors

B By.CLASS_NAME with common class names

C By.ID with unique element IDs

D By.XPATH with absolute paths starting from /html/body

💡 Hint

Think about stability and uniqueness of locators across browsers.

Using By.ID is most reliable because IDs are unique and less likely to change or break across browsers and screen sizes. Absolute XPATHs and complex CSS selectors are brittle.

🔧 Debug

advanced

Why does this BrowserStack test fail to start?

This Python Selenium code snippet fails with a timeout error when trying to start a BrowserStack session. What is the most likely cause?

Selenium Python

from selenium import webdriver

caps = {
    'browserName': 'Firefox',
    'browserVersion': 'latest',
    'bstack:options': {
        'os': 'OS X',
        'osVersion': 'Big Sur'
    }
}

url = 'https://hub-cloud.browserstack.com/wd/hub'

options = webdriver.FirefoxOptions()
options.set_capability('bstack:options', caps['bstack:options'])
options.set_capability('browserName', caps['browserName'])
options.set_capability('browserVersion', caps['browserVersion'])

driver = webdriver.Remote(
    command_executor=url,
    options=options
)

driver.get('https://example.com')

A Incorrect browser version string format

B Missing BrowserStack username and access key in the URL

C Using FirefoxOptions instead of ChromeOptions

D Invalid OS version name

💡 Hint

Check how authentication is handled in BrowserStack remote URLs.

BrowserStack requires username and access key in the remote URL for authentication. Without them, the session cannot start and times out.

❓ framework

expert

Which test framework feature best supports parallel cloud testing?

You want to run Selenium tests in parallel on Sauce Labs to speed up execution. Which feature of pytest best supports this?

A pytest-xdist plugin with multiple workers

B pytest-mock plugin for mocking web elements

C pytest-html plugin for generating reports

D pytest-cov plugin for measuring code coverage

💡 Hint

Think about running tests simultaneously.

pytest-xdist allows running tests in parallel using multiple worker processes, which is ideal for parallel cloud testing.

Practice

1. What is the main advantage of using cloud testing platforms like BrowserStack or Sauce Labs for Selenium tests?

easy

A. You do not need to write any Selenium code

B. They automatically fix bugs in your code

C. Tests run only on your local machine

D. You can test on many browsers and devices without owning them

Solution

1. Step 1: Understand cloud testing platform purpose

   Cloud platforms provide access to many browsers and devices remotely.

2. Step 2: Compare options

   Only the option stating 'You can test on many browsers and devices without owning them' correctly states the main advantage; others are incorrect or unrelated.

3. Final Answer:

   You can test on many browsers and devices without owning them -> Option D

4. Quick Check:

   Cloud testing = remote multi-browser/device access [OK]

Hint: Cloud platforms = test many devices remotely [OK]

Common Mistakes:

• Thinking tests run locally only
• Believing cloud platforms fix code bugs
• Assuming no Selenium code is needed

2. Which of the following is the correct way to specify the remote WebDriver URL for BrowserStack in Python Selenium?

easy

A. driver = webdriver.Remote(command_executor='https://hub-cloud.browserstack.com/wd/hub', desired_capabilities=capabilities)

B. driver = webdriver.Chrome('https://hub-cloud.browserstack.com/wd/hub')

C. driver = webdriver.Firefox('browserstack.com')

D. driver = webdriver.Remote('http://localhost:4444/wd/hub')

Solution

1. Step 1: Identify correct Remote WebDriver syntax

   Using webdriver.Remote with command_executor URL and capabilities is correct for BrowserStack.

2. Step 2: Check other options

   Options using Firefox or Chrome constructors with URLs are incorrect; the option with localhost URL is also wrong.

3. Final Answer:

   driver = webdriver.Remote(command_executor='https://hub-cloud.browserstack.com/wd/hub', desired_capabilities=capabilities) -> Option A

4. Quick Check:

   Remote WebDriver + BrowserStack URL = driver = webdriver.Remote(command_executor='https://hub-cloud.browserstack.com/wd/hub', desired_capabilities=capabilities) [OK]

Hint: Use webdriver.Remote with BrowserStack URL [OK]

Common Mistakes:

• Using local URLs instead of BrowserStack URL
• Calling Chrome or Firefox constructors with URLs
• Omitting desired capabilities

3. Given this Python Selenium code snippet for Sauce Labs, what will be printed if the test runs successfully?

from selenium import webdriver
caps = {
  'browserName': 'chrome',
  'platformName': 'Windows 10',
  'browserVersion': 'latest'
}
driver = webdriver.Remote(
  command_executor='https://username:[e-mail]:443/wd/hub',
  desired_capabilities=caps
)
driver.get('https://example.com')
print(driver.title)
driver.quit()

medium

A. An error about missing local Chrome driver

B. The title of https://example.com page

C. Empty string

D. Sauce Labs login page title

Solution

1. Step 1: Understand remote driver usage

   The code uses Sauce Labs remote URL with correct capabilities, so it runs on Sauce Labs cloud.

2. Step 2: Analyze driver.get and print

   driver.get loads example.com, and driver.title prints its page title.

3. Final Answer:

   The title of https://example.com page -> Option B

4. Quick Check:

   Remote driver loads page title = The title of https://example.com page [OK]

Hint: Remote driver prints page title, not errors [OK]

Common Mistakes:

• Expecting local driver errors
• Thinking remote driver prints login page
• Assuming empty title without loading

4. You wrote this code to run tests on BrowserStack but get a connection error:

driver = webdriver.Remote(
  command_executor='https://hub-cloud.browserstack.com/wd/hub',
  desired_capabilities=capabilities
)

What is the most likely cause and fix?

medium

A. Missing username and access key in URL; add them as https://username:[e-mail]/wd/hub

B. Wrong browser name in capabilities; change to 'firefox'

C. Local WebDriver server not running; start Selenium server locally

D. Use HTTP instead of HTTPS in URL

Solution

1. Step 1: Identify connection error cause

   BrowserStack requires authentication via username and access key in the URL.

2. Step 2: Fix URL with credentials

   Add username and access key before the host in the URL to authenticate properly.

3. Final Answer:

   Missing username and access key in URL; add them as https://username:[e-mail]/wd/hub -> Option A

4. Quick Check:

   Authentication URL format fixes connection [OK]

Hint: Add username:accesskey@ in URL for BrowserStack [OK]

Common Mistakes:

• Ignoring authentication in remote URL
• Changing browser name without cause
• Assuming local server needed for cloud

5. You want to run a Selenium test on BrowserStack for a mobile device with these requirements: Android 13, Chrome browser, and device name 'Samsung Galaxy S22'. Which desired capabilities dictionary is correct?

hard

A. {
'platformName': 'Android',
'platformVersion': '12',
'browserName': 'Chrome',
'deviceName': 'Samsung Galaxy S22'
}

B. {
'platformName': 'Windows',
'platformVersion': '13',
'browserName': 'Chrome',
'deviceName': 'Samsung Galaxy S22'
}

C. {
'platformName': 'Android',
'platformVersion': '13',
'browserName': 'Chrome',
'deviceName': 'Samsung Galaxy S22'
}

D. {
'platformName': 'Android',
'browserName': 'Firefox',
'deviceName': 'Samsung Galaxy S22'
}

Solution

1. Step 1: Match platform and version

   Android 13 is required, so platformName must be 'Android' and platformVersion '13'.

2. Step 2: Check browser and device name

   Browser must be 'Chrome' and deviceName 'Samsung Galaxy S22' exactly.

3. Step 3: Eliminate incorrect options

   The option with platformVersion '12' has wrong version; the one with 'Windows' has wrong platform; the one with 'Firefox' and no version has wrong browser and missing version.

4. Final Answer:

   { 'platformName': 'Android', 'platformVersion': '13', 'browserName': 'Chrome', 'deviceName': 'Samsung Galaxy S22' } -> Option C

5. Quick Check:

   Correct platform, version, browser, device = { 'platformName': 'Android', 'platformVersion': '13', 'browserName': 'Chrome', 'deviceName': 'Samsung Galaxy S22' } [OK]

Hint: Match all capability keys exactly for device testing [OK]

Common Mistakes:

• Using wrong platform or version
• Choosing wrong browser name
• Missing platformVersion key