Headless browser execution in Selenium Python - Test Execution Trace

Test Overview

This test opens a browser in headless mode, navigates to a webpage, finds a heading element, and verifies its text content.

Test Code - unittest

Selenium Python

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
import unittest

class HeadlessBrowserTest(unittest.TestCase):
    def setUp(self):
        options = Options()
        options.headless = True
        self.driver = webdriver.Chrome(options=options)

    def test_heading_text(self):
        self.driver.get('https://example.com')
        heading = self.driver.find_element(By.TAG_NAME, 'h1')
        self.assertEqual(heading.text, '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 Chrome browser in headless mode	Chrome browser is launched without UI (headless)	-	PASS
2	Browser navigates to 'https://example.com'	Page loads with heading 'Example Domain'	-	PASS
3	Finds the <h1> element on the page	Element with tag 'h1' containing text 'Example Domain' is located	-	PASS
4	Checks if the heading text equals 'Example Domain'	Heading text is 'Example Domain'	Assert heading.text == 'Example Domain'	PASS
5	Test tears down and closes the browser	Headless browser session ends	-	PASS

Failure Scenario

Failing Condition: The <h1> element is not found or text does not match 'Example Domain'

Execution Trace Quiz - 3 Questions

What does headless mode mean in this test?

A The browser runs with a graphical interface

B The browser runs without opening a visible window

C The browser runs slower than normal

D The browser runs only on mobile devices

Key Result

Using headless mode allows tests to run faster and without opening a visible browser window, which is useful for automated testing environments.