Assertions and Validation in Playwright

Assertions and validation are essential components of automated testing and play a critical role in ensuring that the expected behavior of a web application is verified. In Playwright, assertions are used to check if elements exist, have specific values, or meet certain conditions. If the conditions are not met, the test will fail, providing useful feedback about potential issues with the application.

In this section, we’ll cover various aspects of assertions and validation in Playwright, including how to use built-in assertion libraries, different types of assertions, and how to validate dynamic content effectively.

1. Introduction to Assertions in Playwright

Assertions are statements that check if a condition is true. If the assertion fails (i.e., the condition is false), the test will fail, and an error message is typically displayed. Assertions are used to confirm that the web page behaves as expected at specific points during the test execution.

In Playwright, assertions are most commonly used to:

• Check if an element exists or is visible
• Verify the state of elements (e.g., checked, enabled, or focused)
• Validate the text or content inside elements
• Ensure that specific values (e.g., input field values, links, titles) meet the expected values
• Validate the page’s behavior, such as the title or URL