Headless mode for CI in Selenium Python - Test Execution Trace

Test Overview

This test opens a web page in headless mode using Selenium WebDriver in Python. It verifies that the page title matches the expected title, ensuring the test can run in a Continuous Integration (CI) environment without opening a browser window.

Test Code - unittest

Selenium Python

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
import unittest

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

    def test_page_title(self):
        self.driver.get('https://example.com')
        title = self.driver.title
        self.assertEqual(title, 'Example Domain')

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

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

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Test starts and Chrome WebDriver is initialized with headless option enabled	Chrome browser runs in headless mode (no visible window)	-	PASS
2	Driver navigates to 'https://example.com'	Page loads in headless browser	-	PASS
3	Driver retrieves the page title	Page title is 'Example Domain'	Check if page title equals 'Example Domain'	PASS
4	Driver quits and browser session ends	No browser processes running	-	PASS

Failure Scenario

Failing Condition: Page title does not match 'Example Domain' or page fails to load

Execution Trace Quiz - 3 Questions

Why is headless mode used in this test?

A To run tests without opening a visible browser window

B To slow down the test execution

C To open multiple browser windows

D To disable JavaScript on the page

Key Result

Using headless mode allows tests to run in environments without a graphical interface, such as CI servers, making automated testing faster and resource-efficient.