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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;});