Selenium with Python for Testing Login Pages

1. What is Selenium?

Selenium is an open-source automation tool used for testing web applications across different browsers. It allows you to simulate user actions like clicking buttons, entering text, or navigating between pages — all through code.

Selenium works with many programming languages, including Python, making it a popular choice for automated web testing.

2. Why Use Selenium for Login Testing?

Testing login functionality is critical because it:

Verifies access control

Confirms proper error handling (e.g., wrong password)

Ensures session management works correctly

Selenium helps automate and repeat these tests efficiently.

3. Basic Setup

a. Install Selenium

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pip install selenium

b. Download WebDriver

Each browser needs a corresponding driver:

Chrome → ChromeDriver

Firefox → GeckoDriver

Make sure the driver is in your system’s PATH or specify the path in code.

4. Sample Python Code for Login Test

python

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from selenium import webdriver

from selenium.webdriver.common.by import By

from selenium.webdriver.common.keys import Keys

import time

# Set up the browser driver (Chrome example)

driver = webdriver.Chrome()

# Step 1: Open the login page

driver.get("https://example.com/login")

# Step 2: Locate username and password fields

username_input = driver.find_element(By.NAME, "username")  # or By.ID, By.XPATH

password_input = driver.find_element(By.NAME, "password")

# Step 3: Enter credentials

username_input.send_keys("your_username")

password_input.send_keys("your_password")

# Step 4: Submit the form

login_button = driver.find_element(By.XPATH, "//button[@type='submit']")

login_button.click()

# Step 5: Wait and verify login

time.sleep(3)

# Check login success (e.g., check for dashboard or logout button)

if "dashboard" in driver.current_url:

    print("Login successful!")

else:

    print("Login failed!")

# Step 6: Close the browser

driver.quit()

5. Best Practices

Use waits: Replace time.sleep() with WebDriverWait for better reliability.

Handle invalid logins: Test scenarios with wrong credentials.

Use Page Object Model (POM): For cleaner, reusable test code.

Log and report: Record results of each test run.

6. Example: Using WebDriverWait

python

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from selenium.webdriver.support.ui import WebDriverWait

from selenium.webdriver.support import expected_conditions as EC

# Wait until the element appears

wait = WebDriverWait(driver, 10)

dashboard_element = wait.until(EC.presence_of_element_located((By.ID, 'dashboard')))

7. Summary

Using Selenium with Python for testing login pages allows you to:

Automate repeated tests

Simulate real user interactions

Validate login success and error handling

Integrate with CI/CD pipelines for continuous testing

Learn Selenium Python Training in Hyderabad

Read More

Taking Screenshots with Selenium WebDriver in Python

How to Handle Multiple Browser Tabs or Windows in Selenium

Waits in Selenium: Implicit vs Explicit Waits Explained

Automating Form Filling Using Selenium and Python

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June 17, 2025

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