Custom wait conditions in Selenium Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a custom wait condition in Selenium?

A custom wait condition is a user-defined rule that tells Selenium to wait until a specific condition is true before continuing the test. It helps handle cases where built-in waits are not enough.

beginner

How do you create a custom wait condition in Selenium with Python?

You create a function that takes a WebDriver as input and returns True when the condition is met or False otherwise. Then you use WebDriverWait with this function.

beginner

Why use custom wait conditions instead of fixed sleep times?

Custom waits wait only as long as needed, making tests faster and more reliable. Fixed sleeps waste time and can cause flaky tests if the wait is too short or too long.

intermediate

Example of a simple custom wait condition function in Selenium Python?

from selenium.webdriver.common.by import By

def element_has_text(driver):
    element = driver.find_element(By.ID, 'message')
    return element.text == 'Loaded'

This waits until the element with ID 'message' has text 'Loaded'.

beginner

What exception does WebDriverWait raise if the custom condition is not met in time?

It raises a TimeoutException to indicate the wait timed out before the condition became true.

What does a custom wait condition function in Selenium Python return when the condition is met?

A An exception

B False

C True

D None

The custom wait condition function returns True when the condition is met, signaling WebDriverWait to proceed.

Which Selenium class is used to apply custom wait conditions?

A WebDriverWait

B ExpectedConditions

C ActionChains

D Select

WebDriverWait is used to wait until a custom or built-in condition is true.

What happens if the custom wait condition is not met within the timeout?

A TimeoutException is raised

B Test passes anyway

C The browser closes automatically

D The condition is ignored

If the condition is not met in time, WebDriverWait raises a TimeoutException.

Why are custom wait conditions better than fixed sleep() calls?

A They always wait the maximum time

B They wait only as long as needed

C They make tests slower

D They ignore page loading

Custom waits wait dynamically, improving test speed and reliability.

Which argument does a custom wait condition function receive?

A Locator string

B Timeout value

C Test case name

D WebDriver instance

The function receives the WebDriver instance to check page state.

Explain how to implement a custom wait condition in Selenium Python and why it is useful.

Think about waiting for specific page states dynamically.

Describe what happens when a custom wait condition times out in Selenium tests.

Consider how Selenium signals wait failures.