@jest/globals
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Package description
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.
Changelog
29.6.0
[jest-circus, jest-snapshot] Add support for snapshot matchers in concurrent tests (#14139)[jest-cli] Include type definitions to generated config files (#14078)[jest-snapshot] Support arrays as property matchers (#14025)[jest-core, jest-circus, jest-reporter, jest-runner] Added support for reporting about start individual test cases using jest-circus (#14174)[jest-circus] Prevent false test failures caused by promise rejections handled asynchronously (#14110)[jest-config] Handle frozen config object (#14054)[jest-config] Allow coverageDirectory and collectCoverageFrom in project config (#14180)[jest-core] Always use workers in watch mode to avoid crashes (#14059).[jest-environment-jsdom, jest-environment-node] Fix assignment of customExportConditions via testEnvironmentOptions when custom env subclass defines a default value (#13989)[jest-matcher-utils] Fix copying value of inherited getters (#14007)[jest-mock] Tweak typings to allow jest.replaceProperty() replace methods (#14008)[jest-mock] Improve user input validation and error messages of spyOn and replaceProperty methods (#14087)[jest-runtime] Bind jest.isolateModulesAsync to this (#14083)[jest-runtime] Forward wrapperLength to the Script constructor as columnOffset for accurate debugging (#14148)[jest-runtime] Guard _isMockFunction access with in (#14188)[jest-snapshot] Fix a potential bug when not using prettier and improve performance (#14036)[@jest/transform] Do not instrument .json modules (#14048)[jest-worker] Restart a shut down worker before sending it a task (#14015)[*] Update semver dependency to get vulnerability fix (#14262)[docs] Updated documentation for the --runTestsByPath CLI command (#14004)[docs] Updated documentation regarding the synchronous fallback when asynchronous code transforms are unavailable (#14056)[docs] Update jest statistics of use and downloads in website Index.FAQs
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The npm package @jest/globals receives a total of 19,522,599 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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