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- /**
- * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
- */
- import first from '../src/first';
- describe( 'utils', () => {
- describe( 'first', () => {
- it( 'should return first item', () => {
- const collection = [ 11, 22 ];
- const iterator = collection[ Symbol.iterator ]();
- expect( first( iterator ) ).to.equal( 11 );
- } );
- it( 'should return null if iterator is empty', () => {
- const collection = [];
- const iterator = collection[ Symbol.iterator ]();
- expect( first( iterator ) ).to.be.null;
- } );
- it( 'should consume the iterating item', () => {
- const collection = [ 11, 22 ];
- const iterator = collection[ Symbol.iterator ]();
- first( iterator );
- expect( iterator.next().value ).to.equal( 22 );
- } );
- } );
- } );
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