@jest/expect-utils
Advanced tools
This module exports some utils for the `expect` function used in [Jest](https://jestjs.io/).
@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.
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');jest-extended provides a large number of additional matchers for Jest. It offers a wide range of matchers similar to @jest/expect-utils, such as toBeArray, toBeObject, and toBeEmpty, but also includes many more specialized matchers.
Chai is an assertion library for Node.js and the browser that can be paired with any testing framework. It provides a rich set of matchers and is highly extensible. While it is not specifically designed for Jest, it offers similar functionalities through its expect/should interfaces.
expect-more is a set of additional matchers for Jest and Jasmine. It provides a variety of matchers for different data types and use cases, similar to @jest/expect-utils, and aims to make tests more expressive and readable.
@jest/expect-utilsThis module exports some utils for the expect function used in Jest.
You probably don't want to use this package directly. E.g. if you're writing custom matcher, you should use the injected this.equals.
28.1.3
[jest-leak-detector] Use native FinalizationRegistry when it exists to get rid of external C dependency (#12973)[jest-changed-files] Fix a lock-up after repeated invocations (#12757)[@jest/expect-utils] Fix deep equality of ImmutableJS OrderedSets (#12977)[jest-mock] Add index signature support for spyOn types (#13013, #13020)[jest-snapshot] Fix indentation of awaited inline snapshots (#12986)FAQs
This module exports some utils for the `expect` function used in [Jest](https://jestjs.io/).
We found that @jest/expect-utils demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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