chai-arrays 
a simple chai plugin for better array assertions
Installation
npm install chai-arrays
Usage
plug-in
const chai = require('chai');
const assertArrays = require('chai-arrays');
chai.use(assertArrays);
array
Asserts that the type of actual is Array.
expect([1, 2, 3]).to.be.array();
expect('foobar').not.to.be.array();
expect(new Uint8Array([1])).to.be.Uint8Array();
expect(new Uint16Array([1])).to.be.Uint16Array();
expect(new Uint32Array([1])).to.be.Uint32Array();
expect(new Uint8ClampedArray([1])).to.be.Uint8ClampedArray();
ofSize
Asserts that the size of actual is equal to expected.
expect([1, 2, 3]).to.be.ofSize(3);
expect([1, 2, 3]).not.to.be.ofSize(5);
equalTo
Asserts that the actual is equal to expected.
expect([1, 2, 3]).to.be.equalTo([1, 2, 3]);
expect([1, 2, 3]).not.to.be.equalTo([1, 2, 5]);
containing
Asserts that the actual is containing the expected element.
expect([1, 2, 3]).to.be.containing(1);
expect([1, 2, 3]).not.to.be.containing(5);
containingAllOf
Asserts that the actual is containing all of the expected elements.
expect([1, 2, 3]).to.be.containingAllOf([1]);
expect([1, 2, 3]).to.be.containingAllOf([1, 3]);
expect([1, 2, 3]).to.be.containingAllOf([1, 2, 3]);
containingAnyOf
Asserts that the actual is containing any of the expected elements.
expect([1, 2, 3]).to.be.containingAnyOf([1]);
expect([1, 2, 3]).to.be.containingAnyOf([6, 7, 3, 5]);
expect([1, 2, 3]).to.be.containingAnyOf([1, 2, 3]);
sorted
Asserts that the actual array is sorted.
expect([1, 2, 3]).to.be.sorted();
expect([1, 2, 4, 3]).not.to.be.sorted();
expect([3, 2, 1]).to.be.sorted((prev, next) => prev < next); // sorting based on the provided function
License
Copyright 2020 @ GaneshSPatil
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.