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Testing Fundamentalstesting~15 mins

Compatibility testing in Testing Fundamentals - Build an Automation Script

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Verify website compatibility on different browsers
Preconditions (2)
Step 1: Open Chrome browser
Step 2: Navigate to the test website URL
Step 3: Verify the homepage loads without layout issues
Step 4: Open Firefox browser
Step 5: Navigate to the test website URL
Step 6: Verify the homepage loads without layout issues
Step 7: Open Edge browser
Step 8: Navigate to the test website URL
Step 9: Verify the homepage loads without layout issues
✅ Expected Result: The homepage should load correctly on Chrome, Firefox, and Edge without layout or functional issues
Automation Requirements - Selenium WebDriver with Python
Assertions Needed:
Page title contains expected text
Key page elements are visible and correctly displayed
Best Practices:
Use explicit waits to wait for elements
Use browser driver management for different browsers
Use Page Object Model to organize locators and actions
Automated Solution
Testing Fundamentals
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

class HomePage:
    def __init__(self, driver):
        self.driver = driver
        self.logo_locator = (By.ID, 'site-logo')
        self.main_heading_locator = (By.TAG_NAME, 'h1')

    def is_logo_visible(self):
        return WebDriverWait(self.driver, 10).until(
            EC.visibility_of_element_located(self.logo_locator)
        )

    def get_main_heading_text(self):
        heading = WebDriverWait(self.driver, 10).until(
            EC.visibility_of_element_located(self.main_heading_locator)
        )
        return heading.text


def test_website_compatibility():
    url = 'https://example.com'
    browsers = ['chrome', 'firefox', 'edge']
    expected_title_keyword = 'Example Domain'

    for browser_name in browsers:
        if browser_name == 'chrome':
            driver = webdriver.Chrome()
        elif browser_name == 'firefox':
            driver = webdriver.Firefox()
        elif browser_name == 'edge':
            driver = webdriver.Edge()
        else:
            continue

        try:
            driver.get(url)

            # Assert page title contains expected keyword
            assert expected_title_keyword in driver.title, f"Title check failed on {browser_name}"

            home_page = HomePage(driver)

            # Assert logo is visible
            assert home_page.is_logo_visible(), f"Logo not visible on {browser_name}"

            # Assert main heading text is correct
            heading_text = home_page.get_main_heading_text()
            assert heading_text == 'Example Domain', f"Heading text mismatch on {browser_name}"

            print(f"Compatibility test passed on {browser_name}")

        finally:
            driver.quit()

if __name__ == '__main__':
    test_website_compatibility()

This script tests the website on Chrome, Firefox, and Edge browsers.

We use Selenium WebDriver to open each browser and navigate to the URL.

The HomePage class uses the Page Object Model to keep locators and actions organized.

Explicit waits ensure elements like the logo and heading are visible before checking.

Assertions check the page title and key elements to confirm the page loaded correctly.

Finally, the browser closes after each test to keep the environment clean.

Common Mistakes - 4 Pitfalls
Using implicit waits instead of explicit waits
Hardcoding browser driver paths
Not closing the browser after each test
Using brittle locators like absolute XPaths
Bonus Challenge

Now add data-driven testing with 3 different URLs to verify compatibility across multiple sites.

Show Hint

Practice

(1/5)
1. What is the main goal of compatibility testing in software testing?
easy
A. To check if software works correctly on different devices and systems
B. To test the speed of the software under heavy load
C. To find security vulnerabilities in the software
D. To verify the software's user interface design

Solution

  1. Step 1: Understand the purpose of compatibility testing

    Compatibility testing focuses on ensuring software functions well across various devices, operating systems, and browsers.
  2. Step 2: Compare options with this purpose

    Only To check if software works correctly on different devices and systems matches this goal. Other options relate to performance, security, or UI testing, which are different testing types.
  3. Final Answer:

    To check if software works correctly on different devices and systems -> Option A
  4. Quick Check:

    Compatibility testing = check software on different devices [OK]
Hint: Compatibility testing checks software on various devices [OK]
Common Mistakes:
  • Confusing compatibility testing with performance testing
  • Thinking it tests security issues
  • Mixing it up with UI design testing
2. Which of the following is the correct way to describe compatibility testing?
easy
A. Testing software only on the developer's machine
B. Testing software without any devices or emulators
C. Testing software on multiple browsers and operating systems
D. Testing software only for syntax errors

Solution

  1. Step 1: Identify the correct description of compatibility testing

    Compatibility testing involves running software on different browsers, devices, and operating systems to ensure it works everywhere.
  2. Step 2: Evaluate each option

    Testing software on multiple browsers and operating systems correctly describes this. Testing software only on the developer's machine is too limited, B is impossible, and D relates to code syntax, not compatibility.
  3. Final Answer:

    Testing software on multiple browsers and operating systems -> Option C
  4. Quick Check:

    Compatibility testing = multiple browsers and OS [OK]
Hint: Compatibility means testing on many browsers and OS [OK]
Common Mistakes:
  • Testing only on one device
  • Ignoring emulators or real devices
  • Confusing syntax testing with compatibility
3. Consider this scenario: A web app works fine on Chrome and Firefox but crashes on Safari. What does this indicate in terms of compatibility testing?
medium
A. The app has a compatibility issue with Safari
B. The app has a performance issue on Safari
C. The app has a security flaw on Safari
D. The app has a UI design problem on Safari

Solution

  1. Step 1: Analyze the problem across browsers

    The app crashes only on Safari but works on others, showing it does not behave consistently across browsers.
  2. Step 2: Identify the type of issue

    This is a compatibility issue because the app is not compatible with Safari. Performance, security, or UI issues would show different symptoms.
  3. Final Answer:

    The app has a compatibility issue with Safari -> Option A
  4. Quick Check:

    Crash on one browser = compatibility issue [OK]
Hint: Crash on one browser means compatibility problem [OK]
Common Mistakes:
  • Confusing compatibility with performance issues
  • Assuming it's a security problem
  • Thinking UI design causes crashes
4. You wrote a compatibility test script that runs on Windows and Linux but fails on MacOS. What is the most likely cause?
medium
A. The script has syntax errors
B. The script uses Windows-specific commands not supported on MacOS
C. The script is missing test cases
D. The script runs too fast on MacOS

Solution

  1. Step 1: Understand why script fails on MacOS

    If the script works on Windows and Linux but fails on MacOS, it likely uses commands or features specific to Windows that MacOS does not support.
  2. Step 2: Rule out other options

    Syntax errors would cause failure everywhere, missing test cases wouldn't cause failure, and speed is unrelated to failure.
  3. Final Answer:

    The script uses Windows-specific commands not supported on MacOS -> Option B
  4. Quick Check:

    Platform-specific commands cause compatibility failure [OK]
Hint: Check for OS-specific commands causing failure [OK]
Common Mistakes:
  • Assuming syntax errors cause platform-specific failure
  • Ignoring platform differences in commands
  • Thinking speed affects compatibility
5. You need to ensure a mobile app works on Android 10, Android 11, iOS 14, and iOS 15. Which approach best fits compatibility testing?
hard
A. Test only on Android devices since iOS is similar
B. Test only on the latest Android and iOS versions
C. Test only on emulators without real devices
D. Test the app on real devices and reliable emulators for each OS version

Solution

  1. Step 1: Identify the best testing approach for multiple OS versions

    Testing on both real devices and reliable emulators ensures accurate results across all targeted OS versions.
  2. Step 2: Evaluate other options

    Testing only latest versions misses older versions. Testing only emulators or only Android devices reduces coverage and accuracy.
  3. Final Answer:

    Test the app on real devices and reliable emulators for each OS version -> Option D
  4. Quick Check:

    Use real devices + emulators for full compatibility [OK]
Hint: Use real devices and emulators for full coverage [OK]
Common Mistakes:
  • Testing only latest OS versions
  • Skipping real devices
  • Ignoring iOS testing
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