Element locators in page class in Selenium Python - Test Execution Trace

Test Overview

This test opens a web page, uses a page class to find a login button by its locator, clicks it, and verifies the next page shows a welcome message.

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 LoginPage:
    def __init__(self, driver):
        self.driver = driver
        self.login_button_locator = (By.ID, "login-btn")

    def click_login(self):
        login_button = WebDriverWait(self.driver, 10).until(
            EC.element_to_be_clickable(self.login_button_locator)
        )
        login_button.click()

class TestLogin(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Chrome()
        self.driver.get("https://example.com/login")

    def test_click_login_button(self):
        page = LoginPage(self.driver)
        page.click_login()
        welcome_text = WebDriverWait(self.driver, 10).until(
            EC.visibility_of_element_located((By.ID, "welcome-msg"))
        ).text
        self.assertEqual(welcome_text, "Welcome User")

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

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

Execution Trace - 6 Steps

Step	Action	System State	Assertion	Result
1	Test starts and Chrome browser opens	Browser window is open, ready to load URL	-	PASS
2	Browser navigates to https://example.com/login	Login page is loaded with login button visible	-	PASS
3	LoginPage object is created with driver	Page class has locator for login button stored	-	PASS
4	Waits until login button is clickable and clicks it	Login button is clicked, page starts loading next content	-	PASS
5	Waits until welcome message element is visible	Welcome message element with text 'Welcome User' is visible	Check that welcome message text equals 'Welcome User'	PASS
6	Test ends and browser closes	Browser window is closed	-	PASS

Failure Scenario

Failing Condition: Login button is not found or not clickable within 10 seconds

Execution Trace Quiz - 3 Questions

What does the test verify after clicking the login button?

A That the URL changes to the home page

B That the welcome message with text 'Welcome User' appears

C That the login button disappears

D That the page title changes to 'Dashboard'

Key Result

Using a page class to store element locators keeps test code clean and easy to maintain by separating page details from test logic.