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expect
Advanced tools
Package description
The 'expect' npm package is a library for writing test assertions. It is commonly used in conjunction with testing frameworks like Jest or Mocha to validate the behavior of JavaScript code. It provides a range of assertion types and matchers that allow developers to write expressive and readable tests.
Basic Assertions
This feature allows you to assert that a value matches exactly what you expect. The 'toBe' matcher compares with ===.
expect(2 + 2).toBe(4);
Object Property Assertions
With this feature, you can assert that an object has a specific property with a certain value. The 'toHaveProperty' matcher checks for the existence and value of a property in an object.
expect({ name: 'Alice', age: 30 }).toHaveProperty('name', 'Alice');
Exception Testing
This feature is used to test if a function throws an exception when it is executed. The 'toThrow' matcher is used to assert that an error is thrown with a specific message.
expect(() => { throw new Error('failure'); }).toThrow('failure');
Array Containment
This feature allows you to assert that an array contains a specific item. The 'toContain' matcher checks if an array includes the expected item.
expect(['Alice', 'Bob', 'Eve']).toContain('Bob');
Asynchronous Assertions
This feature enables you to write assertions for asynchronous code. The 'resolves' matcher waits for a promise to resolve and then checks the resolved value.
expect(Promise.resolve('success')).resolves.toBe('success');
Chai is a BDD/TDD assertion library for node and the browser that can be paired with any javascript testing framework. It offers a similar range of matchers and assertions as expect, and it provides a fluent chainable language to construct assertions.
Should.js is an expressive, readable, framework-agnostic assertion library. The key difference is in the style of assertions it offers, using a more fluent chainable API that reads like English.
Assert is a module that provides a set of assertion functions for verifying invariants. It is built into Node.js and is less feature-rich compared to expect, but it serves as a simple way to write assertions in a Node.js environment.
Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It comes with its own assertion library, which provides functionality similar to expect, as expect is actually part of Jest.
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.Readme
This package exports the expect
function used in Jest. You can find its documentation on Jest's website.
FAQs
This package exports the `expect` function used in [Jest](https://jestjs.io/). You can find its documentation [on Jest's website](https://jestjs.io/docs/expect).
The npm package expect receives a total of 24,573,076 weekly downloads. As such, expect popularity was classified as popular.
We found that expect demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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