Test class using page objects in Selenium Python - Test Execution Trace

Test Overview

This test opens a login page, enters username and password using page objects, clicks login, and verifies successful login by checking the 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.username_input = (By.ID, "username")
        self.password_input = (By.ID, "password")
        self.login_button = (By.ID, "loginBtn")

    def enter_username(self, username):
        self.driver.find_element(*self.username_input).clear()
        self.driver.find_element(*self.username_input).send_keys(username)

    def enter_password(self, password):
        self.driver.find_element(*self.password_input).clear()
        self.driver.find_element(*self.password_input).send_keys(password)

    def click_login(self):
        self.driver.find_element(*self.login_button).click()

class HomePage:
    def __init__(self, driver):
        self.driver = driver
        self.welcome_message = (By.ID, "welcomeMsg")

    def get_welcome_text(self):
        return self.driver.find_element(*self.welcome_message).text

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

    def test_valid_login(self):
        self.login_page.enter_username("testuser")
        self.login_page.enter_password("securepass")
        self.login_page.click_login()
        WebDriverWait(self.driver, 10).until(
            EC.presence_of_element_located(self.home_page.welcome_message)
        )
        welcome_text = self.home_page.get_welcome_text()
        self.assertEqual(welcome_text, "Welcome, testuser!")

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

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

Execution Trace - 7 Steps

Step	Action	System State	Assertion	Result
1	Test starts and Chrome browser opens	Browser window is open at https://example.com/login showing login form with username, password fields and login button	-	PASS
2	Find username input field and enter 'testuser'	Username field contains 'testuser'	-	PASS
3	Find password input field and enter 'securepass'	Password field contains 'securepass'	-	PASS
4	Find and click the login button	Login button clicked, page starts loading home page	-	PASS
5	Wait up to 10 seconds for welcome message element to appear	Welcome message element is present on the page	Check presence of element located by ID 'welcomeMsg'	PASS
6	Get text from welcome message element	Welcome message text is 'Welcome, testuser!'	Assert that welcome message text equals 'Welcome, testuser!'	PASS
7	Close browser and end test	Browser closed	-	PASS

Failure Scenario

Failing Condition: Welcome message element does not appear within 10 seconds after login

Execution Trace Quiz - 3 Questions

What does the test verify after clicking the login button?

A That the username field is cleared

B That the login button is disabled

C That the welcome message with text 'Welcome, testuser!' appears

D That the password is visible on screen

Key Result

Using page objects separates page details from test logic, making tests easier to read and maintain.