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@jest/expect-utils

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@jest/expect-utils

This module exports some utils for the `expect` function used in [Jest](https://jestjs.io/).


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What is @jest/expect-utils?

@jest/expect-utils is a utility package for Jest that provides additional matchers and utilities to enhance the testing experience. It is designed to work seamlessly with Jest's built-in expect function, allowing for more expressive and readable test assertions.

What are @jest/expect-utils's main functionalities?

toBeArray

Checks if the value is an array.

expect([1, 2, 3]).toBeArray();

toBeObject

Checks if the value is an object.

expect({ key: 'value' }).toBeObject();

toBeEmpty

Checks if the value is empty. This can be used for arrays, objects, or strings.

expect([]).toBeEmpty();

toContainKey

Checks if the object contains the specified key.

expect({ key: 'value' }).toContainKey('key');

toContainValue

Checks if the object contains the specified value.

expect({ key: 'value' }).toContainValue('value');

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Package last updated on 12 Sep 2023

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