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