@vitest/expect

@vitest/expect

Jest's expect matchers as a Chai plugin.

Usage

import {
  JestAsymmetricMatchers,
  JestChaiExpect,
  JestExtend,
} from '@vitest/expect'
import * as chai from 'chai'

// allows using expect.extend instead of chai.use to extend plugins
chai.use(JestExtend)
// adds all jest matchers to expect
chai.use(JestChaiExpect)
// adds asymmetric matchers like stringContaining, objectContaining
chai.use(JestAsymmetricMatchers)

Similar packages

Other packages similar to @vitest/expect

jest

Jest is a well-known testing framework that includes its own expectation library, very similar to @vitest/expect. It offers a comprehensive suite of features for testing JavaScript code, including snapshot testing, global setup/teardown, and more. Compared to @vitest/expect, Jest is more established but also heavier, making @vitest/expect a lighter alternative for projects already using Vitest.

chai

Chai is an assertion library for node and the browser that can be paired with any testing framework. It offers a range of interfaces (expect, should, assert) that allow developers to write tests in a style that suits them best. Compared to @vitest/expect, Chai is more flexible in terms of integration but does not offer the same level of integration with the Vitest ecosystem.

expect

The expect package is another assertion library that provides a set of extensive matchers to write tests. It is lightweight and does not tie itself to a specific test runner. While it shares similar functionalities with @vitest/expect, it lacks the tight integration and specific optimizations for the Vitest environment.