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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.
29.4.0
[expect, @jest/expect-utils]
Support custom equality testers (#13654)[jest-config, jest-worker]
Use os.availableParallelism
if available to calculate number of workers to spawn (#13738)[@jest/globals, jest-mock]
Add jest.replaceProperty()
that replaces property value (#13496)[jest-haste-map]
ignore Sapling vcs directories (.sl/
) (#13674)[jest-resolve]
Support subpath imports (#13705, #13723, #13777)[jest-runtime]
Add jest.isolateModulesAsync
for scoped module initialization of asynchronous functions (#13680)[jest-runtime]
Add jest.isEnvironmentTornDown
function (#13741)[jest-test-result]
Added skipped
and focused
status to FormattedTestResult
(#13700)[jest-transform]
Support for asynchronous createTransformer
(#13762)[jest-environment-node]
Fix non-configurable globals (#13687)[@jest/expect-utils]
toMatchObject
should handle Symbol
properties (#13639)[jest-mock]
Fix mockReset
and resetAllMocks
undefined
return value(#13692)[jest-resolve]
Add global paths to require.resolve.paths
(#13633)[jest-resolve]
Correct node core module detection when using node:
specifiers (#13806)[jest-runtime]
Support WASM files that import JS resources (#13608)[jest-runtime]
Use the scriptTransformer
cache in jest-runner
(#13735)[jest-runtime]
Enforce import assertions when importing JSON in ESM (#12755 & #13805)[jest-snapshot]
Make sure to import babel
outside of the sandbox (#13694)[jest-transform]
Ensure the correct configuration is passed to preprocessors specified multiple times in the transform
option (#13770)FAQs
Unknown package
The npm package @jest/globals receives a total of 21,717,075 weekly downloads. As such, @jest/globals popularity was classified as popular.
We found that @jest/globals 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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