Why cross-browser ensures compatibility in Selenium Python - Test Execution Impact

Test Overview

This test opens a simple webpage in two different browsers (Chrome and Firefox) using Selenium. It verifies that a key element is present and visible in both browsers. This ensures the webpage works correctly across browsers, confirming compatibility.

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 CrossBrowserTest(unittest.TestCase):
    def setUp(self):
        # Setup Chrome driver
        self.chrome_driver = webdriver.Chrome()
        # Setup Firefox driver
        self.firefox_driver = webdriver.Firefox()

    def test_element_visibility_in_both_browsers(self):
        url = "https://example.com"

        # Test in Chrome
        self.chrome_driver.get(url)
        WebDriverWait(self.chrome_driver, 10).until(
            EC.visibility_of_element_located((By.ID, "main-content"))
        )
        element_chrome = self.chrome_driver.find_element(By.ID, "main-content")
        self.assertTrue(element_chrome.is_displayed())

        # Test in Firefox
        self.firefox_driver.get(url)
        WebDriverWait(self.firefox_driver, 10).until(
            EC.visibility_of_element_located((By.ID, "main-content"))
        )
        element_firefox = self.firefox_driver.find_element(By.ID, "main-content")
        self.assertTrue(element_firefox.is_displayed())

    def tearDown(self):
        self.chrome_driver.quit()
        self.firefox_driver.quit()

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

Execution Trace - 8 Steps

Step	Action	System State	Assertion	Result
1	Test starts - Initialize Chrome and Firefox WebDriver instances	Two browser windows (Chrome and Firefox) are ready but not yet navigated	-	PASS
2	Chrome browser opens and navigates to https://example.com	Chrome browser displays the webpage loading	-	PASS
3	Wait until element with ID 'main-content' is visible in Chrome	Chrome shows the webpage with 'main-content' element visible	Check element 'main-content' is visible in Chrome	PASS
4	Find element with ID 'main-content' in Chrome and assert it is displayed	Element found and visible in Chrome	assertTrue(element_chrome.is_displayed())	PASS
5	Firefox browser opens and navigates to https://example.com	Firefox browser displays the webpage loading	-	PASS
6	Wait until element with ID 'main-content' is visible in Firefox	Firefox shows the webpage with 'main-content' element visible	Check element 'main-content' is visible in Firefox	PASS
7	Find element with ID 'main-content' in Firefox and assert it is displayed	Element found and visible in Firefox	assertTrue(element_firefox.is_displayed())	PASS
8	Close both Chrome and Firefox browsers	Both browser windows closed	-	PASS

Failure Scenario

Failing Condition: Element with ID 'main-content' is missing or not visible in one of the browsers

Execution Trace Quiz - 3 Questions

What does the test verify in both Chrome and Firefox browsers?

A That the element with ID 'main-content' is visible

B That the page title is correct

C That the browser window size is the same

D That the URL contains 'example'

Key Result

Running the same test on multiple browsers helps catch differences in how browsers display or handle web pages, ensuring the website works well for all users.