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import { HtmlStream } from '~/streaming/html_stream';
import { ChunkWriter } from '~/streaming/chunk_writer';
jest.mock('~/streaming/chunk_writer');
describe('HtmlStream', () => {
let write;
let close;
let streamingElement;
beforeEach(() => {
write = jest.fn();
close = jest.fn();
jest.spyOn(Document.prototype, 'write').mockImplementation(write);
jest.spyOn(Document.prototype, 'close').mockImplementation(close);
jest.spyOn(Document.prototype, 'querySelector').mockImplementation(() => {
streamingElement = document.createElement('div');
return streamingElement;
});
});
it('attaches to original document', () => {
// eslint-disable-next-line no-new
new HtmlStream(document.body);
expect(document.body.contains(streamingElement)).toBe(true);
});
it('can write to a document', () => {
const htmlStream = new HtmlStream(document.body);
htmlStream.write('foo');
htmlStream.close();
expect(write.mock.calls).toEqual([['<streaming-element>'], ['foo'], ['</streaming-element>']]);
expect(close).toHaveBeenCalledTimes(1);
});
it('returns chunked writer', () => {
const htmlStream = new HtmlStream(document.body).withChunkWriter();
expect(htmlStream).toBeInstanceOf(ChunkWriter);
});
it('closes on abort', () => {
const htmlStream = new HtmlStream(document.body);
htmlStream.abort();
expect(close).toHaveBeenCalled();
});
});
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