Data providers pattern in Selenium Python - Test Execution Trace

Test Overview

This test uses the data providers pattern to run the same login test with multiple username and password pairs. It verifies that the login succeeds for each set of credentials.

Test Code - unittest

Selenium Python

import unittest
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

class LoginTest(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.driver = webdriver.Chrome()
        cls.driver.implicitly_wait(5)

    @classmethod
    def tearDownClass(cls):
        cls.driver.quit()

    def login_test(self, username, password):
        driver = self.driver
        driver.get('https://example.com/login')
        username_field = driver.find_element(By.ID, 'username')
        password_field = driver.find_element(By.ID, 'password')
        login_button = driver.find_element(By.ID, 'login-btn')

        username_field.clear()
        username_field.send_keys(username)
        password_field.clear()
        password_field.send_keys(password)
        login_button.click()

        WebDriverWait(driver, 10).until(
            EC.presence_of_element_located((By.ID, 'welcome-msg'))
        )
        welcome_text = driver.find_element(By.ID, 'welcome-msg').text
        self.assertIn('Welcome', welcome_text)

    def test_login_with_multiple_users(self):
        test_data = [
            ('user1', 'pass1'),
            ('user2', 'pass2'),
            ('user3', 'pass3')
        ]
        for username, password in test_data:
            with self.subTest(username=username):
                self.login_test(username, password)

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

Execution Trace - 8 Steps

Step	Action	System State	Assertion	Result
1	Test starts and Chrome browser opens	Browser window is open	-	PASS
2	Navigate to login page for user1	Login page loaded with username and password fields	-	PASS
3	Find username, password fields and login button	Elements located by IDs: username, password, login-btn	-	PASS
4	Enter username 'user1' and password 'pass1', then click login	Login form submitted	-	PASS
5	Wait until element with ID 'welcome-msg' is present	Welcome message element appears	Check that welcome message text contains 'Welcome'	PASS
6	Repeat steps 2-5 for user2 with password 'pass2'	Login page loaded and login successful for user2	Welcome message contains 'Welcome'	PASS
7	Repeat steps 2-5 for user3 with password 'pass3'	Login page loaded and login successful for user3	Welcome message contains 'Welcome'	PASS
8	Test ends and browser closes	Browser window closed	-	PASS

Failure Scenario

Failing Condition: If the welcome message element does not appear after login or text does not contain 'Welcome'

Execution Trace Quiz - 3 Questions

What does the test verify after clicking the login button?

A That the welcome message with 'Welcome' text appears

B That the login button is disabled

C That the username field is cleared

D That the password field shows the password

Key Result

Using data providers pattern with subTest allows running the same test logic for multiple data sets cleanly and reports each case separately.