What is expect() used for in tests?
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In Playwright, you can locate elements using a variety of methods, similar to Selenium. Playwright supports several ways to find elements on a web page, including CSS selectors, XPath, and text-based selectors. Here’s an overview of the main techniques to locate elements in Playwright, with examples.
In Playwright, the method page .wait For Selector() plays an important role in waiting for an element to appear (or become visible) on the page before interacting with it.
In tests, especially in frameworks like Jest or Cypress, expect() is used to create an assertion — a statement that checks whether a particular condition is true.
What does expect() do?
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It verifies that your code behaves as expected.
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It compares actual values against expected values.
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If the condition inside
expect()fails, the test will fail, alerting you to issues.
Example in JavaScript:
This checks that 2 + 2 equals 4. If not, the test fails.
Typical uses:
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Check values (
toBe,toEqual) -
Check if something is truthy or falsy
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Check if arrays or objects contain certain data
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Verify that functions throw errors or return results
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