Selenium components (WebDriver, Grid, IDE) in Selenium Python - Build an Automation Script

Verify Google Search using Selenium WebDriver

Preconditions (3)

Step 1: Open Chrome browser using Selenium WebDriver

Step 2: Navigate to 'https://www.google.com'

Step 3: Locate the search input field by its name attribute 'q'

Step 4: Enter the search term 'Selenium WebDriver'

Step 5: Submit the search form

Step 6: Wait for the search results page to load

Step 7: Verify that the page title contains the search term 'Selenium WebDriver'

✅ Expected Result: The browser opens Google homepage, performs the search, and the results page title contains 'Selenium WebDriver'

Automation Requirements - Selenium WebDriver with Python

Assertions Needed:

Verify page title contains the search term after search

Verify search input field is present before typing

Best Practices:

Use explicit waits to wait for elements or page conditions

Use By locators for element identification

Close the browser after test execution

Handle exceptions gracefully

Automated Solution

Selenium Python

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC


def test_google_search():
    # Initialize Chrome WebDriver
    driver = webdriver.Chrome()
    try:
        # Open Google homepage
        driver.get('https://www.google.com')

        # Wait until the search box is present
        wait = WebDriverWait(driver, 10)
        search_box = wait.until(EC.presence_of_element_located((By.NAME, 'q')))

        # Enter search term and submit
        search_term = 'Selenium WebDriver'
        search_box.send_keys(search_term + Keys.RETURN)

        # Wait until title contains search term
        wait.until(EC.title_contains(search_term))

        # Assert title contains search term
        assert search_term in driver.title, f"Title does not contain '{search_term}'"

    finally:
        # Close the browser
        driver.quit()


if __name__ == '__main__':
    test_google_search()

This script uses Selenium WebDriver with Python to automate the manual test case.

First, it opens the Chrome browser and navigates to Google.

It waits explicitly for the search input field to appear using WebDriverWait and expected_conditions.

Then it types the search term and submits the form by sending the RETURN key.

Next, it waits until the page title contains the search term to ensure the results page loaded.

Finally, it asserts the title contains the search term and closes the browser in a finally block to ensure cleanup.

This approach follows best practices: using explicit waits, proper locators, and clean resource management.

Common Mistakes - 4 Pitfalls

Using time.sleep() instead of explicit waits

Using incorrect locator strategies like XPath with absolute paths

Not closing the browser after test

Not verifying element presence before interacting

Bonus Challenge

Now add data-driven testing with 3 different search terms: 'Selenium WebDriver', 'Python testing', 'Automation QA'

Show Hint

Practice

1. Which Selenium component allows you to write test scripts in programming languages like Python?

easy

A. WebDriver

B. Grid

C. IDE

D. Selenium Server

Solution

1. Step 1: Understand Selenium components

   WebDriver is the part of Selenium that lets you write code to control browsers.

2. Step 2: Match component to functionality

   Grid is for running tests in parallel, IDE is for recording tests, so only WebDriver fits writing code tests.

3. Final Answer:

   WebDriver -> Option A

4. Quick Check:

   Write tests in code = WebDriver [OK]

Hint: Code tests? Think WebDriver [OK]

Common Mistakes:

• Confusing Grid with writing code
• Thinking IDE is for coding tests
• Selecting Selenium Server which is not a main component

2. Which of the following is the correct way to start a Chrome WebDriver session in Python?

easy

A. driver = webdriver.start('chrome')

B. driver = webdriver.Chrome()

C. driver = ChromeDriver()

D. driver = webdriver.open('chrome')

Solution

1. Step 1: Recall Selenium Python syntax

   The standard way to start Chrome WebDriver is using webdriver.Chrome() constructor.

2. Step 2: Check other options for syntax errors

   Options A, C, and D use incorrect method names or classes not defined in Selenium Python.

3. Final Answer:

   driver = webdriver.Chrome() -> Option B

4. Quick Check:

   Correct constructor = webdriver.Chrome() [OK]

Hint: Use webdriver.Chrome() to start Chrome [OK]

Common Mistakes:

• Using undefined methods like start() or open()
• Trying to instantiate ChromeDriver directly
• Missing webdriver prefix

3. What will be the output of the following Python Selenium code snippet?

from selenium import webdriver
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()
driver.get('https://example.com')
element = driver.find_element(By.ID, 'submit')
print(element.tag_name)

medium

A. NoSuchElementException

B. submit

C. id

D. button

Solution

1. Step 1: Understand the code behavior

   The code opens example.com and tries to find an element with ID 'submit'.

2. Step 2: Check the target page

   The example.com page does not contain an element with id='submit', so driver.find_element raises NoSuchElementException before the print statement executes.

3. Final Answer:

   NoSuchElementException -> Option A

4. Quick Check:

   No element on page = NoSuchElementException [OK]

Hint: Verify element exists on the actual page [OK]

Common Mistakes:

• Assuming example.com has id='submit'
• Confusing element ID with tag name
• Expecting print to run despite missing element

4. You want to run tests on multiple machines at the same time using Selenium. You wrote this code but tests run only on one machine. What is missing?

from selenium import webdriver

options = webdriver.ChromeOptions()
driver = webdriver.Chrome(options=options)
driver.get('https://example.com')

medium

A. You must use webdriver.Firefox() instead

B. You forgot to import Selenium Grid module

C. You need to configure Selenium Grid and connect to it

D. You should use Selenium IDE for parallel tests

Solution

1. Step 1: Identify the problem context

   The code runs tests on one machine only, but the goal is parallel testing on multiple machines.

2. Step 2: Understand Selenium Grid role

   Selenium Grid allows running tests on many machines simultaneously. The code must connect to the Grid hub to distribute tests.

3. Final Answer:

   You need to configure Selenium Grid and connect to it -> Option C

4. Quick Check:

   Parallel tests require Selenium Grid setup [OK]

Hint: Parallel tests need Selenium Grid connection [OK]

Common Mistakes:

• Assuming importing a module enables Grid
• Switching browsers does not enable parallelism
• Using IDE instead of Grid for parallel runs

5. You want to record a test quickly without coding and then export it to Python WebDriver code. Which Selenium component should you use?

hard

A. Selenium Server

B. Selenium Grid

C. Selenium WebDriver

D. Selenium IDE

Solution

1. Step 1: Identify the requirement

   The user wants to record tests without writing code and export to Python WebDriver code.

2. Step 2: Match Selenium component to feature

   Selenium IDE is a browser plugin that records user actions and can export recorded tests to code in various languages including Python WebDriver.

3. Final Answer:

   Selenium IDE -> Option D

4. Quick Check:

   Record tests and export code = Selenium IDE [OK]

Hint: Record tests visually? Use Selenium IDE [OK]

Common Mistakes:

• Confusing Grid with recording tests
• Thinking WebDriver records tests
• Assuming Selenium Server handles recording