Find element by ID in Selenium Python - Test Execution Trace

Test Overview

This test opens a web page, finds an element using its ID, clicks it, and verifies the expected page change.

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 TestFindElementByID(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Chrome()
        self.driver.get('https://example.com')

    def test_click_button_by_id(self):
        driver = self.driver
        # Wait until the button with ID 'submit-btn' is present
        button = WebDriverWait(driver, 10).until(
            EC.presence_of_element_located((By.ID, 'submit-btn'))
        )
        button.click()
        # Verify the URL changed to expected page
        WebDriverWait(driver, 10).until(
            EC.url_contains('submit-success')
        )
        self.assertIn('submit-success', driver.current_url)

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

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

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts and Chrome browser opens	Browser window is open at 'https://example.com'	-	PASS
2	Wait until element with ID 'submit-btn' is present	Page loaded with a button having ID 'submit-btn'	Element with ID 'submit-btn' is found	PASS
3	Click the button with ID 'submit-btn'	Button clicked, page starts navigation	-	PASS
4	Wait until URL contains 'submit-success'	Browser URL changes to include 'submit-success'	Current URL contains 'submit-success'	PASS
5	Test ends and browser closes	Browser window closed	-	PASS

Failure Scenario

Failing Condition: Element with ID 'submit-btn' is not found within 10 seconds

Execution Trace Quiz - 3 Questions

What Selenium method is used to find the element by ID?

A driver.find_element_by_class_name('submit-btn')

B driver.find_element_by_name('submit-btn')

C WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, 'submit-btn')))

D driver.find_element_by_xpath('//button')

Key Result

Always wait explicitly for elements to be present before interacting to avoid flaky tests caused by timing issues.