peek-iterator.test.ts

import {expect} from '@esm-bundle/chai';
import {PeekIterator} from './peek-iterator';

test('PeekIterator', () => {
  const c = new PeekIterator('abc'[Symbol.iterator]());
  expect(c.peek().value).to.equal('a');
  expect(c.peek().value).to.equal('a');
  expect(c.next().value).to.equal('a');
  expect(c.peek().value).to.equal('b');
  expect(c.peek().value).to.equal('b');
  expect(c.next().value).to.equal('b');
  expect(c.peek().value).to.equal('c');
  expect(c.peek().value).to.equal('c');
  expect(c.next().value).to.equal('c');
  expect(c.peek().done).to.be.true;
  expect(c.peek().done).to.be.true;
  expect(c.next().done).to.be.true;
});