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@vitest/expect

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@vitest/expect

Jest's expect matchers as a Chai plugin

  • 2.1.8
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  • npm
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9.3M
decreased by-7.79%
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4
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What is @vitest/expect?

The @vitest/expect package is a part of the Vitest testing framework, designed to work seamlessly with its ecosystem. It provides a powerful expectation library that allows developers to write assertions for their tests. This package is particularly useful for unit and integration testing, offering a wide range of matchers and utilities to test the behavior of JavaScript code.

What are @vitest/expect's main functionalities?

Basic Expectations

Allows for basic equality checks, useful for asserting that a value matches an expected result.

expect(value).toBe(42);

Object and Array Matching

Enables deep equality checks for objects and arrays, as well as checking for the presence of an item in an array.

expect(object).toEqual({ key: 'value' });
expect(array).toContain(item);

Asynchronous Testing

Facilitates testing of asynchronous operations, allowing assertions on resolved values of promises.

await expect(Promise.resolve('value')).resolves.toBe('value');

Mocking and Spies

Supports the creation of mock functions and spies, enabling the testing of function calls and their arguments.

const mockFunction = vi.fn();
expect(mockFunction).toHaveBeenCalledTimes(1);

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Package last updated on 02 Dec 2024

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