/** * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved. * For licensing, see LICENSE.md. */ import nth from '/ckeditor5/utils/nth.js'; describe( 'utils', () => { describe( 'nth', () => { it( 'should return 0th item', () => { expect( nth( 0, getIterator() ) ).to.equal( 11 ); } ); it( 'should return the last item', () => { expect( nth( 2, getIterator() ) ).to.equal( 33 ); } ); it( 'should return null if out of range (bottom)', () => { expect( nth( -1, getIterator() ) ).to.be.null; } ); it( 'should return null if out of range (top)', () => { expect( nth( 3, getIterator() ) ).to.be.null; } ); it( 'should return null if iterator is empty', () => { expect( nth( 0, [] ) ).to.be.null; } ); function *getIterator() { yield 11; yield 22; yield 33; } } ); } );