expect-more

expect-more

Curried JavaScript Type Testing Library with Zero Dependencies

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

• isFunction: (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