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@jest/globals
Advanced tools
The @jest/globals package provides access to Jest's global variables and functions, making it easier to write tests by providing a consistent testing environment. This package is particularly useful when working with ES modules, where Jest's globals are not automatically available. It includes functionalities such as test definition, mocking, and assertions.
Defining tests
Allows the definition of test cases. The `test` function is used to define a block of code that tests a specific part of your application. The `expect` function is used to make an assertion about a particular value.
import { test, expect } from '@jest/globals';
test('adds 1 + 2 to equal 3', () => {
expect(1 + 2).toBe(3);
});
Mocking functions
Enables the mocking of functions, allowing you to simulate the behavior of your code's dependencies. This is useful for isolating the code under test and controlling its environment.
import { jest } from '@jest/globals';
const mockFn = jest.fn();
mockFn.mockReturnValue('mocked value');
expect(mockFn()).toBe('mocked value');
Grouping tests
Provides a way to group related tests using the `describe` function. This helps in organizing tests, especially when testing complex applications.
import { describe, test, expect } from '@jest/globals';
describe('math operations', () => {
test('adds 1 + 2 to equal 3', () => {
expect(1 + 2).toBe(3);
});
test('subtracts 2 - 1 to equal 1', () => {
expect(2 - 1).toBe(1);
});
});
Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple. It's similar to @jest/globals in providing a testing structure (describe and it blocks), but it requires additional libraries like Chai for assertions and Sinon for spies, mocks, and stubs.
Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework. It's similar to the assertion part of @jest/globals, offering a range of assertions via expect, should, and assert interfaces. However, it does not provide test runner or mocking capabilities.
Sinon provides standalone test spies, stubs, and mocks for JavaScript. Works with any unit testing framework. It's similar to the mocking functionality of @jest/globals but is focused solely on the aspect of mocking, without an integrated test runner or assertion library.
27.4.0
[expect]
Enhancing the toHaveProperty
matcher to support array selection (#12092)[jest-core]
Add support for testResultsProcessor
written in ESM (#12006)[jest-diff, pretty-format]
Add compareKeys
option for custom sorting of object keys (#11992)[jest-mock]
Add ts-jest
mock util functions (#12089)[expect]
Allow again expect.Matchers
generic with single value (#11986)[jest-circus, jest-jasmine2]
Avoid false concurrent test failures due to unhandled promise rejections (#11987)[jest-config]
Add missing slash
dependency to package.json
(#12080)[jest-core]
Incorrect detection of open ZLIB handles (#12022)[jest-diff]
Break dependency cycle (#10818)[jest-environment-jsdom]
Add @types/jsdom
dependency (#11999)[jest-environment-jsdom]
Do not reset the global.document too early on teardown (#11871)[jest-transform]
Improve error and warning messages (#11998)[jest-worker]
Pass execArgv
correctly to worker_threads
worker (#12069)FAQs
Unknown package
The npm package @jest/globals receives a total of 13,788,927 weekly downloads. As such, @jest/globals popularity was classified as popular.
We found that @jest/globals demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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