How to verify an object is empty object with Jest (extended)

First install jest-extended with the npm install --save-dev jest-extended command and use the toBeEmpty assertion as in the following example:

const { toBeEmpty } = require('jest-extended'); expect.extend({ toBeEmpty }); describe('setFulltextSearchTermsFilter', () => { test('returns filter without $text when fulltextSearchTerms is empty', () => { const fulltextSearchTerms = []; const filter = {}; const searchInclude = 'any'; expect(searchUtils.setFulltextSearchTermsFilter(fulltextSearchTerms, filter, searchInclude)).toBeEmpty(); }); }); 

Use .toBeEmpty when checking if a String '', Array [], Object {}, or Iterable is empty. Because toBeEmpty supports checking for emptiness of Iterables, you can use it to check whether a Map, or Set is empty, as well as checking that a generator yields no values.

Project: codever - File: search.utils.spec.js

Reference -

https://jest-extended.jestcommunity.dev/docs/matchers/tobeempty

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