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expect-more

Curried JavaScript Type Testing Library with Zero Dependencies


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expect-more

Curried JavaScript Type Testing Library with Zero Dependencies

NPM version NPM downloads Build Status Maintainability Follow JamieMason on GitHub Follow fold_left on Twitter

Status

This is a new project which needs a lot of work on documentation. It is under active development so there will likely be changes, but at its core it is a rewrite of the core logic behind the matchers in jasmine-expect which is a mature, well-tested library.

Installation

npm install expect-more --save-dev

Usage

import { endsWith, isWithinRange } from 'expect-more';

endsWith('Script', 'JavaScript');
// => true

const endsWithScript = endsWith('Script');
endsWithScript('JavaScript');
// => true

isWithinRange(10, 20, 21);
// => false

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34].filter(isWithinRange(5, 15));
// => [5, 8, 13]

API

General

  • isBoolean: (value: any) => boolean
  • isFalse: (value: any) => boolean
  • isNull: (value: any) => boolean
  • isRegExp: (value: any) => boolean
  • isTrue: (value: any) => boolean
  • isUndefined: (value: any) => boolean

Functions

  • isAsyncFunction: (value: any) => boolean
  • isFunction: (value: any) => boolean
  • isGeneratorFunction: (value: any) => boolean
  • throwsAnyError: (value: () => void) => boolean
  • throwsErrorOfType: (typeName: string, value: () => void) => boolean

Objects

  • hasMember: (memberName: string, value: any) => boolean
  • isEmptyObject: (value: any) => boolean
  • isNonEmptyObject: (value: any) => boolean
  • isObject: (value: any) => boolean
  • isWalkable: (value: any) => boolean

Arrays

  • isArray: (value: any) => boolean
  • isArrayOfBooleans: (value: any) => boolean
  • isArrayOfNumbers: (value: any) => boolean
  • isArrayOfObjects: (value: any) => boolean
  • isArrayOfSize: (size: number, value: any) => boolean
  • isArrayOfStrings: (value: any) => boolean
  • isEmptyArray: (any) => boolean
  • isNonEmptyArray: (value: any) => boolean

Dates

  • isAfter: (other: Date, value: any) => boolean
  • isBefore: (other: Date, value: any) => boolean
  • isDate: (value: any) => boolean
  • isIso8601: (value: any) => boolean
  • isValidDate: (value: any) => boolean

Numbers

  • isCalculable: (value: any) => boolean
  • isDivisibleBy: (other: number, value: any) => boolean
  • isEvenNumber: (value: any) => boolean
  • isGreaterThanOrEqualTo: (other: number, value: any) => boolean
  • isLessThanOrEqualTo: (other: number, value: any) => boolean
  • isNear: (other: number, epsilon: number, value: any) => boolean
  • isNumber: (value: any) => boolean
  • isOddNumber: (value: any) => boolean
  • isWholeNumber: (value: any) => boolean
  • isWithinRange: (floor: number, ceiling: number, value: any) => boolean

Strings

  • endsWith: (other: string, value: any) => boolean
  • isEmptyString: (value: any) => boolean
  • isJsonString: (value: any) => boolean
  • isLongerThan: (other: string, value: any) => boolean
  • isNonEmptyString: (value: any) => boolean
  • isSameLengthAs: (other: string, value: any) => boolean
  • isShorterThan: (other: string, value: any) => boolean
  • isString: (value: any) => boolean
  • isWhitespace: (value: any) => boolean
  • startsWith: (other: string, value: any) => boolean

FAQs

Package last updated on 03 Nov 2019

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