Cloud testing platforms (BrowserStack, Sauce Labs) in Selenium Python - Test Execution Trace

Test Overview

This test opens a web page using BrowserStack cloud platform with Selenium in Python. It verifies the page title to confirm the correct page loaded.

Test Code - Selenium

Selenium Python

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import unittest

class BrowserStackTest(unittest.TestCase):
    def setUp(self):
        desired_cap = {
            'browserName': 'Chrome',
            'browserVersion': 'latest',
            'bstack:options': {
                'os': 'Windows',
                'osVersion': '11',
                'local': False,
                'seleniumVersion': '4.8.0'
            }
        }
        self.driver = webdriver.Remote(
            command_executor='https://YOUR_USERNAME:[e-mail]/wd/hub',
            desired_capabilities=desired_cap
        )

    def test_page_title(self):
        self.driver.get('https://example.com')
        WebDriverWait(self.driver, 10).until(
            EC.title_contains('Example Domain')
        )
        self.assertEqual(self.driver.title, 'Example Domain')

    def tearDown(self):
        self.driver.quit()

if __name__ == '__main__':
    unittest.main()

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts and sets up remote WebDriver with BrowserStack capabilities	Remote WebDriver session is created on BrowserStack cloud with Windows 11 and Chrome latest	—	PASS
2	Browser opens and navigates to 'https://example.com'	Browser window on cloud platform loads the Example Domain page	—	PASS
3	Waits until page title contains 'Example Domain'	Page title is 'Example Domain'	Title contains 'Example Domain'	PASS
4	Asserts that page title equals 'Example Domain'	Page title is exactly 'Example Domain'	self.assertEqual(driver.title, 'Example Domain')	PASS
5	Test tears down and closes the remote browser session	Browser session on BrowserStack is closed	—	PASS

Failure Scenario

Failing Condition: If the page title does not match 'Example Domain' within 10 seconds

Execution Trace Quiz - 3 Questions

What does the test verify after opening the page on BrowserStack?

A The page title is 'Example Domain'

B The page URL contains 'browserstack'

C The browser version is Chrome 90

D The page has a login form

Key Result

Using cloud testing platforms like BrowserStack allows running tests on real browsers and OS combinations remotely, ensuring wider coverage without managing local infrastructure.

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