@stdlib/math-base-assert-is-nan
Test if a double-precision floating-point numeric value is NaN.
Found 2038 results for assertion helpers
@stdlib/assert-is-object-like
Test if a value is object-like.
chai-url
A chai assertion plugin for working with urls
geojson-equality
Check two valid geojson geometries for equality.
@stdlib/assert-is-boolean
Test if a value is a boolean.
@stdlib/assert-is-string
Test if a value is a string.
@stdlib/assert-is-big-endian
Check if an environment is big endian.
@stdlib/math-base-assert-is-infinite
Test if a double-precision floating-point numeric value is infinite.
@stdlib/assert-is-buffer
Test if a value is a Buffer object.
geojson-equality-ts
Check two valid geojson geometries for equality.
@stdlib/assert-is-plain-object
Test if a value is a plain object.
@stdlib/assert-is-function
Test if a value is a function.
@stdlib/assert-is-uint32array
Test if a value is a Uint32Array.
@stdlib/assert-is-uint8array
Test if a value is a Uint8Array.
@stdlib/assert-is-uint16array
Test if a value is a Uint16Array.
@stdlib/assert-is-float64array
Test if a value is a Float64Array.
@stdlib/assert-is-regexp-string
Test if a value is a regular expression string.
@stdlib/assert-is-little-endian
Check if an environment is little endian.
empower-core
Power Assert feature enhancer for assert function/object
@stdlib/assert-is-object
Test if a value is an object.
@stdlib/assert-is-float32array
Test if a value is a Float32Array.
@stdlib/assert-is-number
Test if a value is a number.
qunit
The powerful, easy-to-use testing framework.
typechecker
Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)
eslint-plugin-ava
ESLint rules for AVA
expect-puppeteer
Assertion toolkit for Puppeteer.
power-assert
Power Assert in JavaScript
testcafe
Automated browser testing for the modern web development stack.
power-assert-formatter
Power Assert output formatter
empower
Power Assert feature enhancer for assert function/object
chai-json-schema
Chai plugin for JSON Schema v4
@mapbox/fusspot
A tiny runtime library for type assertions
babel-plugin-espower
Babel plugin for power-assert
universal-deep-strict-equal
A port of Node v6's internal _deepEqual function in a universal style
espower-source
Power Assert instrumentor from source to source, with source-map
chai-jest-snapshot
Chai assertion that provides Jest's snapshot testing
yaassertion
Yet another JavaScript assertion/invariant library.
espower
Power Assert feature instrumentor based on the ECMAScript AST
@nightwatch/chai
A forked of Chai 5 which adds Promise support in order to work with Nightwatch commands.
espower-loader
Power Assert feature instrumentor on the fly
empower-assert
Convert assert to power-assert on ESTree AST
@ava/babel-plugin-throws-helper
Babel plugin for protecting against improper use of `t.throws()` in AVA
chai-dom
DOM assertions for the Chai assertion library using vanilla JavaScript
chai-shallow-deep-equal
Shallow deep equal assertion for chai
@stdlib/math-base-assert-is-integer
Test if a finite double-precision floating-point number is an integer.
@stdlib/math-base-assert-is-odd
Test if a finite numeric value is an odd number.
@dramaorg/delectus-culpa-reprehenderit
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![dependency status][deps-svg]][deps-url] [![dev dependency status][dev-deps-svg]][dev-deps-url] [![License][license-image]][license-url] [![Downloads][downloads-im
@stdlib/math-base-assert-is-positive-zero
Test if a double-precision floating-point numeric value is positive zero.
@stdlib/assert-is-nan
Test if a value is NaN.
spok
Checks a given object against a given set of specifications to keep you from writing boilerplate tests.
git-branch-is
Assert that the name of the current branch of a git repository has a particular value.
n4s
Assertion library for form validations
@stdlib/math-base-assert-is-even
Test if a finite numeric value is an even number.
@stdlib/assert-is-int32array
Test if a value is an Int32Array.
@stdlib/assert-is-nonnegative-integer
Test if a value is a number having a nonnegative integer value.
@stdlib/assert-is-integer
Test if a value is a number having an integer value.
@stdlib/assert-is-enumerable-property
Test if an object's own property is enumerable.
@stdlib/assert-is-collection
Test if a value is a collection.
@stdlib/assert-is-uint8clampedarray
Test if a value is a Uint8ClampedArray.
@stdlib/assert-is-int16array
Test if a value is an Int16Array.
assert-valid-glob-opts
Assert a given object is a valid glob option
unassert
Encourages programming with assertions by providing tools to compile them away
@stdlib/math-base-assert-is-negative-zero
Test if a double-precision floating-point numeric value is negative zero.
unexpected
Extensible BDD assertion toolkit
@stdlib/assert-is-int8array
Test if a value is an Int8Array.
@stdlib/assert-is-arguments
Test if a value is an arguments object.
babel-plugin-ava-throws-helper
Babel plugin for protecting against improper use of `t.throws()` in AVA
@stdlib/assert-is-positive-integer
Test if a value is a number having a positive integer value.
unassertify
Browserify transform for unassert: Encourages programming with assertions by providing tools to compile them away
@stdlib/assert-is-error
Test if a value is an Error object.
chai-colors
Color assertions for chai
@hapi/code
assertion library
typy
Minimal JavaScript type checking library
@bahmutov/spok
Checks a given object against a given set of specifications to keep you from writing boilerplate tests.
@stdlib/assert-is-arraybuffer
Test if a value is an ArrayBuffer.
@stdlib/assert
Standard assertion utilities.
mocha-chai-jest-snapshot
provides snapshot testing like jest
@stdlib/assert-instance-of
Test whether a value has in its prototype chain a specified constructor as a prototype property.
chai-xml
Xml assertions for Chai
api-contract-validator
Plugin for validating API schemas from API documentation
@stdlib/assert-is-positive-number
Test if a value is a number having a positive value.
chai-almost
Extends chai with assertions that allow for floating point rounding errors
@stdlib/assert-is-complex-like
Test if a value is a complex number-like object.
power-assert-renderers
Power Assert output renderers
assume
Expect-like assertions that works seamlessly in node and browsers
chai-changes
Change assertions for the Chai assertion library
@ffras4vnpm/facilis-iusto-qui
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
chai-jquery
jQuery assertions for the Chai assertion library
@stdlib/assert-is-array-like-object
Test if a value is an array-like object.
@stdlib/array-base-assert-is-complex64array
Test if a value is a Complex64Array.
@marionebl/is
Type check values: `is.string('🦄') //=> true`
@stdlib/assert-is-array-like
Test if a value is array-like.
@stdlib/assert-is-typed-array
Test if a value is a typed array.
@stdlib/assert-is-complex-typed-array
Test if a value is a complex typed array.
unexpected-messy
Unexpected plugin for the messy library
@micromint1npm/excepturi-commodi-sunt
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
@stdlib/array-base-assert-is-accessor-array
Test if an array-like object supports the accessor (get/set) protocol.
chai-backbone
Backbone assertions for the Chai assertion library
@stdlib/array-base-assert-is-complex128array
Test if a value is a Complex128Array.
@stdlib/math-base-assert-is-nonnegative-integer
Test if a finite double-precision floating-point number is a nonnegative integer.
earl
Ergonomic, modern and type-safe assertion library
@stdlib/assert-is-number-array
Test if a value is an array-like object of numbers.
must
Testing and assertion library with friendly BDD syntax — awesome.must.be.true(). Many expressive matchers and is test runner and framework agnostic. Follows RFC 2119 with its use of MUST. Good and well tested stuff.
@bobyzgirlllnpm/voluptates-provident-consequatur
 
@stdlib/assert-is-typed-array-like
Test if a value is typed-array-like.
unexpected-sinon
This module extends the [Unexpected](https://github.com/unexpectedjs/unexpected) assertion library with integration for the [Sinonjs](http://sinonjs.org/) mocking library.
chai-json
A chai plugin to validate json files
@stdlib/math-base-assert-is-negative-integer
Test if a finite double-precision floating-point number is a negative integer.
@stdlib/assert-is-probability
Test if a value is a probability.
chai-json-equal
Assert on equality of json representations in Chai
chai-fs
Chai assertions for Node.js filesystem
bats-assert
Common assertions for Bats
@stdlib/assert-contains
Test if an array-like value contains a search value.
chai-as-promised-also-chain
Adding .also chain in base library of chai-as-promised
@zibuthe7j11/at-doloribus-nihil
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
@stdlib/math-base-assert-is-positive-integer
Test if a finite double-precision floating-point number is a positive integer.
unexpected-dom
DOM plugin for the unexpected assertion libary
@odczynflnpm/dolorem-maiores-debitis
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
@stdlib/math-base-assert-is-probability
Test if a double-precision floating-point number is a probability.
@bobyzgirlllnpm/nobis-dolore-corporis
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
unit.js
Simple, intuitive and flexible unit testing framework for javascript / Node.js (browser and server). Integrates awesome assertions libraries like Must.js, Should.js, Assert of Node.js, Sinon.js and other friendly features (promise, IoC, plugins, ...).
@stdlib/assert-is-nonnegative-integer-array
Test if a value is an array-like object containing only nonnegative integers.
@crabas0npm/laudantium-omnis-illum
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
chai-wait-for
Drop-in replacement for expect that waits for the assertion to succeed (retries on an interval you choose, until a timeout you choose)
@stdlib/assert-is-string-array
Test if a value is an array of strings.
validation-utils
Validation utilities
@stdlib/assert-is-nonnegative-number
Test if a value is a number having a nonnegative value.
chai-html
HTML assertions for Chai.
poku
🐷 Poku makes testing easy for Node.js, Bun, Deno, and you at the same time.
@stdlib/assert-is-node-writable-stream-like
Test if a value is Node writable stream-like.
@esm2cjs/is
Type check values. This is a fork of sindresorhus/is, but with CommonJS support.
@stdlib/assert-is-node
Check if the runtime is Node.js.
@stdlib/assert-is-node-stream-like
Test if a value is Node stream-like.
@stdlib/assert-is-unity-probability-array
Test if a value is an array of probabilities that sum to one.
@stdlib/assert-napi-is-type
Assert that a Node-API value is a specified Node-API data type.
ember-qunit-nice-errors
Because expected true, result false is not enough!
@stdlib/assert-is-browser
Check if the runtime is a web browser.
unexpected-map
Add support to Unexpected for testing Map instances
unexpected-set
Add support to Unexpected for testing Set instances
@stdlib/assert-is-null
Test if a value is null.
@stdlib/assert-is-dataview
Test if a value is a DataView.
@stdlib/assert-napi-status-ok
C utilities for asserting that a Node-API call returns an "ok" status.
@stdlib/assert-napi-equal-types
Assert that two Node-API data types are equal.
@lambrioanpm/voluptatibus-ducimus-eligendi
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
@stdlib/assert-napi-is-typedarray
Assert that a Node-API value is a Node-API typed array.
@stdlib/assert-napi-equal-typedarray-types
Assert that two Node-API typed array data types are equal.
cucumber-assert
An assertion library for cucumber.js providing cucumber compatible failures instead of exceptions
@stdlib/ndarray-base-assert-is-buffer-length-compatible
Determine if a buffer length is compatible with provided ndarray meta data.
@stdlib/assert-is-method-in
Test if an object has a specified method name, either own or inherited.
joi-assert
Assert values using Joi schemas
objectmodel
Strong Dynamically Typed Object Modeling for JavaScript
@stdlib/assert-is-ndarray-like
Test if a value is ndarray-like.
@stdlib/assert-is-integer-array
Test if a value is an array-like object containing only integers.
@saoviettest/aspernatur-veniam-saepe-blanditiis
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
@xdanangelxoqenpm/itaque-blanditiis-laboriosam
A tiny but capable push & pull stream library for TypeScript and Flow, loosely following the [callbag spec](https://github.com/callbag/callbag)
zora
the lightest yet the fastest javascript testing library
sinon-chai-in-order
A Chai plugin providing assertions on the order of Sinon spy calls
@xdanangelxoqenpm/libero-atque-dolore
A tiny but capable push & pull stream library for TypeScript and Flow, loosely following the [callbag spec](https://github.com/callbag/callbag)
@wemnyelezxnpm/velit-tenetur-temporibus
A tiny but capable push & pull stream library for TypeScript and Flow, loosely following the [callbag spec](https://github.com/callbag/callbag)
typed-validators
complex type validators that generate TypeScript and Flow types for you
@stdlib/assert-is-uri
Test if a value is a URI.
unexpected-knockout
This module extends the [Unexpected](https://github.com/unexpectedjs/unexpected) assertion library with integration for [Knockout](http://knockoutjs.org).
assert-fs-readfile-option
Test if value is valid for fs.readFile option
cypress-intercept-search
A Cypress plugin to recursively search your intercepted requests/responses by key/value
@a-2-c-2-anpm/iste-explicabo-maxime
A tiny but capable push & pull stream library for TypeScript and Flow, loosely following the [callbag spec](https://github.com/callbag/callbag)
unexpected-stream
node.js streams plugin for the Unexpected assertion library
its
Preconditions for safe coding
wait-for-throwable
Simple utility to retry an erroring function until it succeeds
extend-tape
Extends Tape with new assertions
@stdlib/assert-is-semver
Test if a value is a semantic version string.
@bobyzgirlllnpm/assumenda-sunt-odit
Express Handlebars ==================
chai-assert-change
an assertion against a change to a value
chaid
Id equality assertions for chai
inspect.js
Powerful test inspection library
unexpected-eventemitter
EventEmitter assertions for Unexpected
@stdlib/assert-is-capitalized
Test if a value is a string having an uppercase first character.
respect
Comparison plugin for BDD assertion libraries (chai, should)
chai-style
CSS Style assertions for elements, using Chai.js
chai-jq
An alternate jQuery assertion library for Chai.
jasmine-expect-jsx
JSX assertions for Jasmine
jest-expect
Make jest expect more convenient.
argument-contracts
A small and simple library for asserting argument are the correct types
must-call
example.on('end', mustCall(() => {})); Check the callback function is called.
@stdlib/assert-is-empty-array
Test if a value is an empty array.
@slimio/is
SlimIO is (JavaScript Primitives & Objects type checker)
@stdlib/assert-is-iterator-like
Test if a value is iterator-like.
jest-expect-contain-deep
Assert deeply nested values in Jest
snap-shot
Jest-like snapshot feature for the rest of us + data-driven testing
@browserstack/testcafe
Automated browser testing for the modern web development stack.
earljs
Ergonomic, modern and type-safe assertion library
@24vlh/ts-assert
Small footprint library that helps with typescript assertions.
@micromint1npm/voluptate-labore-ipsa
[](https://developer.twitter.com/en/docs/twitter-api/early-access) [
@stdlib/assert-is-undefined-or-null
Test if a value is undefined or null.
gulp-espower
A gulp plugin for power-assert
@stdlib/math-base-assert-is-finite
Test if a double-precision floating-point numeric value is finite.
chai-equal-jsx
JSX assertions for Chai
espowerify
Browserify transform for power-assert
unexpected-magicpen
MagicPen plugin for the Unexpected assertion library
@gemini-testing/mocha
simple, flexible, fun test framework
@crabas0npm/quaerat-accusamus-veniam
Plop ======
@stdlib/math-base-assert-is-nanf
Test if a single-precision floating-point numeric value is NaN.
@plugjs/expect5
Unit Testing for the PlugJS Build System ========================================
chai-cheerio
Cheerio assertions for the Chai assertion library
@stdlib/assert-is-gzip-buffer
Test if a value is a gzip buffer.
jest-callslike
A jest assertion that checks calls for count, order and informed parameters, all at once
@stdlib/assert-is-windows
Boolean indicating if the current process is running on Windows.
is-positive-int
Validate if a value is a positive integer between 0 & Number.MAX_SAFE_INTEGER
karma-chai-equal-jsx
Karma plugin for chai-equal-jsx
eslint-plugin-tape
ESLint rules for tape
borrowing
A utility library that provides borrowing mechanisms via assertion functions
unassessed
Extensible type-aware assertion library
guardz
A simple and lightweight TypeScript type guard library for runtime type validation.
is-any-type
is-any-type simple functionality alternative to check data type references such as typeof and instanceof
chai-jsx
JSX React Element assertions for chai
mismatched
A composable matching/assertion/validation framework in Typescript that displays mismatches as diff trees
ava-http
Async HTTP request wrapper
cypress-should
Supercool assertion library for Cypress
unexpected-immutable
Assert (pretty) equality of Immutable.js iterables with unexpected
@stdlib/assert-has-property
Test if an object has a specified property, either own or inherited.
espower-cli
Command line tool for power-assert
assert-env
Assert that specific environment variables exist.
snapsnap
Tools for snapshotting, replaying, and mocking HTTP queries with Jest
unexpected-dependable
Unexpected plugin for @dependable/state
chai-asserttype-extra
a chai plugin for type assertions, support typescript
@crabas0npm/vitae-atque-placeat
<div align="center"> <h1>🦊 » Random fox images « 🦊</h1> <img src="https://cdn.sefinek.net/images/animals/fox/red-fox-in-the-wild-2-1624831.jpg" alt="Random cat" height="290px"> <div>Please check a more elaborate alternative: <a href="https:/
eslint-plugin-tap
ESLint rules for tap
chai-react
React assertions for the Chai assertion library
@ajhgwdjnpm/vel-optio-earum
@hutechtechnical/nobis-ex-dolor-reprehenderit
The tiny, regex powered, lenient, _almost_ spec-compliant JavaScript tokenizer that never fails.
@hutechtechnical/voluptates-ipsa-in-numquam
 [](https://app.fossa.com/projects/git%2Bgithub.com%2FQuickCorp%2FQCObjects-SDK?ref=badge_shield
@bobyzgirlllnpm/nulla-ipsam-dolor
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![dependency status][5]][6] [![dev dependency status][7]][8] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
@ryniaubenpm/inventore-consectetur-ullam
[](https://nodei.co/npm/@ryniaubenpm/inventore-consectetur-ullam/)
@zibuthe7j11/alias-exercitationem-tempora
Polynomial Identity Language (pil) compiler
@bobyzgirlllnpm/neque-molestiae-qui
@omegion1npm/fuga-ipsa-harum
[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]
@bobyzgirlllnpm/provident-perspiciatis-laboriosam
The algorithm continuously evaluates and scores open source software projects in supported package managers based on their impact and value to the OSS ecosystem.
@a-2-c-2-anpm/eaque-amet-nihil
[](https://www.npmjs.com/package/@a-2-c-2-anpm/eaque-amet-nihil)  [](https://circleci.com/gh/blackflux/@lambrioanpm/quis-quod-ipsa) [](https://www.npmjs.com/p
@crabas0npm/voluptatem-aspernatur-ducimus
> Plant the "@crabas0npm/voluptatem-aspernatur-ducimus" for your next Typescript project and let it grow with this useful lib, providing basic functionalities handy in most projects.
@zibuthe7j11/atque-id-unde
[](https://github.com/zibuthe7j11/atque-id-unde/actions/workflows/ci.yml) [](https://www.npmjs.
@a-2-c-2-anpm/in-iure-repellendus
Eventify is a lightweight module that can be mixed in to any object in order to provide it with custom events. It has no external dependencies. Based on Backbone.Events
@a-2-c-2-anpm/nihil-dolorum-ea
Reads and parses a JSON file.