out-of-your-element/m2d/converters/emoji-sheet.test.js

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const assert = require("assert").strict
const {test} = require("supertape")
const {_convertImageStream} = require("./emoji-sheet")
const fetch = require("node-fetch")
const {Transform} = require("stream").Transform
/* c8 ignore next 7 */
function slow() {
if (process.argv.includes("--slow")) {
return test
} else {
return test.skip
}
}
class Meter extends Transform {
bytes = 0
_transform(chunk, encoding, cb) {
this.bytes += chunk.length
this.push(chunk)
cb()
}
}
/**
* @param {import("supertape").Test} t
* @param {string} url
* @param {number} totalSize
*/
async function runSingleTest(t, url, totalSize) {
const abortController = new AbortController()
const res = await fetch("https://ezgif.com/images/format-demo/butterfly.png", {agent: false, signal: abortController.signal})
const meter = new Meter()
const p = res.body.pipe(meter)
const result = await _convertImageStream(p, () => {
abortController.abort()
res.body.pause()
res.body.emit("end")
})
t.equal(result.subarray(1, 4).toString("ascii"), "PNG", `result was not a PNG file: ${result.toString("base64")}`)
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/* c8 ignore next 5 */
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if (meter.bytes < totalSize / 4) { // should download less than 25% of each file
t.pass("intentionally read partial file")
} else {
t.fail(`read more than 25% of file, read: ${meter.bytes}, total: ${totalSize}`)
}
}
slow()("emoji-sheet: only partial file is read for APNG", async t => {
await runSingleTest(t, "https://ezgif.com/images/format-demo/butterfly.png", 2438998)
})
slow()("emoji-sheet: only partial file is read for GIF", async t => {
await runSingleTest(t, "https://ezgif.com/images/format-demo/butterfly.gif", 781223)
})