Product
Introducing Enhanced Alert Actions and Triage Functionality
Socket now supports four distinct alert actions instead of the previous two, and alert triaging allows users to override the actions taken for all individual alerts.
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
29.2.0
[@jest/cli, jest-config]
A seed for the test run will be randomly generated, or set by a CLI option (#13400)[@jest/cli, jest-config]
--show-seed
will display the seed value in the report, and can be set via a CLI flag or through the config file (#13400)[jest-config]
Add readInitialConfig
utility function (#13356)[jest-core]
Allow testResultsProcessor
to be async (#13343)[@jest/environment, jest-environment-node, jest-environment-jsdom, jest-runtime]
Add getSeed()
to the jest
object (#13400)[expect, @jest/expect-utils]
Allow isA
utility to take a type argument (#13355)[expect]
Expose AsyncExpectationResult
and SyncExpectationResult
types (#13411)[babel-plugin-jest-hoist]
Ignore TSTypeQuery
when checking for hoisted references (#13367)[jest-core]
Fix detectOpenHandles
false positives for some special objects such as TLSWRAP
(#13414)[jest-mock]
Fix mocking of getters and setters on classes (#13398)[jest-reporters]
Revert: Transform file paths into hyperlinks (#13399)[@jest/types]
Infer type of each
table correctly when the table is a tuple or array (#13381)[@jest/types]
Rework typings to allow the *ReturnedWith
matchers to be called with no argument (#13385)[*]
Update @babel/*
deps, resulting in slightly different stack traces for each
(#13422)[jest-runner]
Do not instrument v8 coverage data if coverage should not be collected (#13282)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 25,224,426 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.
Did you know?
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Product
Socket now supports four distinct alert actions instead of the previous two, and alert triaging allows users to override the actions taken for all individual alerts.
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