55 lines
1.6 KiB
JavaScript
55 lines
1.6 KiB
JavaScript
const assert = require("assert").strict
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const {test} = require("supertape")
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const {_convertImageStream} = require("./emoji-sheet")
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const fetch = require("node-fetch")
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const {Transform} = require("stream").Transform
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/* c8 ignore next 7 */
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function slow() {
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if (process.argv.includes("--slow")) {
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return test
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} else {
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return test.skip
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}
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}
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class Meter extends Transform {
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bytes = 0
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_transform(chunk, encoding, cb) {
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this.bytes += chunk.length
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this.push(chunk)
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cb()
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}
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}
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/**
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* @param {import("supertape").Test} t
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* @param {string} url
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* @param {number} totalSize
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*/
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async function runSingleTest(t, url, totalSize) {
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const abortController = new AbortController()
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const res = await fetch("https://ezgif.com/images/format-demo/butterfly.png", {agent: false, signal: abortController.signal})
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const meter = new Meter()
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const p = res.body.pipe(meter)
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const result = await _convertImageStream(p, () => {
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abortController.abort()
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res.body.pause()
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res.body.emit("end")
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})
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t.equal(result.subarray(1, 4).toString("ascii"), "PNG", `result was not a PNG file: ${result.toString("base64")}`)
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if (meter.bytes < totalSize / 4) { // should download less than 25% of each file
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t.pass("intentionally read partial file")
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} else {
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t.fail(`read more than 25% of file, read: ${meter.bytes}, total: ${totalSize}`)
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}
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}
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slow()("emoji-sheet: only partial file is read for APNG", async t => {
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await runSingleTest(t, "https://ezgif.com/images/format-demo/butterfly.png", 2438998)
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})
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slow()("emoji-sheet: only partial file is read for GIF", async t => {
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await runSingleTest(t, "https://ezgif.com/images/format-demo/butterfly.gif", 781223)
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})
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