Playwright · Senior · Question 30 of 77

How do you add a custom matcher like `toHaveCartTotal`?

1Use expect.extend and export the extended expect
2Custom matchers are only possible in Jest, not Playwright
3Add a method to Locator.prototype in the config

Show the answer

Correct answer: Use expect.extend and export the extended expect

Explanation

Custom matchers can be async and use locators, giving readable domain checks with good failure messages.

Further reading

Playwright: Assertions ↗

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