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77 lines
2.3 KiB
JavaScript
77 lines
2.3 KiB
JavaScript
const should = require('should/as-function')
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const sinon = require('sinon')
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const streamMock = require('stream-mock')
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const exifStream = require('../../../src/components/exiftool/stream')
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const parallel = require('../../../src/components/exiftool/parallel')
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describe('exiftool parallel', function () {
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beforeEach(() => {
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sinon.stub(exifStream, 'parse').callsFake(mockExifStream)
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})
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afterEach(() => {
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exifStream.parse.restore()
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})
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it('creates 1 stream if no concurrency', (done) => {
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// test data
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const files = numberedFiles(3)
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const concurrency = 1
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// create the streams
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const stream = parallel.parse('input', files, concurrency)
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reduceStream(stream, emittedData => {
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const emittedPaths = emittedData.map(e => e.SourceFile)
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should(emittedPaths).eql([
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'input/IMG_0001.jpg',
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'input/IMG_0002.jpg',
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'input/IMG_0003.jpg'
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])
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done()
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})
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})
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it('creates concurrent streams to split files evenly', (done) => {
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// test data
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const files = numberedFiles(5)
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const concurrency = 2
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// create the streams
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const stream = parallel.parse('input', files, concurrency)
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reduceStream(stream, emittedData => {
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// should have created 2 streams, with 2 or 3 files each
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sinon.assert.callCount(exifStream.parse, 2)
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should(exifStream.parse.args[0]).eql(['input', ['IMG_0001.jpg', 'IMG_0002.jpg', 'IMG_0003.jpg']])
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should(exifStream.parse.args[1]).eql(['input', ['IMG_0004.jpg', 'IMG_0005.jpg']])
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// should have 5 files in the merged output
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const emittedPaths = emittedData.map(e => e.SourceFile)
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should(emittedPaths).eql([
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'input/IMG_0001.jpg',
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'input/IMG_0002.jpg',
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'input/IMG_0003.jpg',
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'input/IMG_0004.jpg',
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'input/IMG_0005.jpg'
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])
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done()
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})
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})
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})
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function numberedFiles (count) {
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return Array(count).join(' ').split(' ').map((a, i) => `IMG_000${i + 1}.jpg`)
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}
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function mockExifStream (root, filenames) {
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const input = filenames.map(name => {
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return { SourceFile: `${root}/${name}`, Directory: root }
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})
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return new streamMock.ObjectReadableMock(input)
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}
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function reduceStream (stream, done) {
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const emittedData = []
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stream.on('data', entry => {
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emittedData.push(entry)
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}).on('end', () => {
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done(emittedData)
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})
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}
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