59 lines
1.7 KiB
JavaScript
59 lines
1.7 KiB
JavaScript
const {test} = require("supertape")
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const {convertImageStream} = require("./emoji-sheet")
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const fs = require("fs")
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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} path
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* @param {number} totalSize
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* @param {number => boolean} sizeCheck
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*/
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async function runSingleTest(t, path, totalSize, sizeCheck) {
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const file = fs.createReadStream(path)
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const meter = new Meter()
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const p = file.pipe(meter)
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const result = await convertImageStream(p, () => {
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file.pause()
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file.emit("end")
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})
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t.equal(result.subarray(1, 4).toString("ascii"), "PNG", `test that this is a PNG file: ${result.toString("base64").slice(0, 100)}`)
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/* c8 ignore next 5 */
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if (sizeCheck(meter.bytes)) {
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t.pass("read the correct amount of the file")
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} else {
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t.fail(`read too much or too little of the 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, "test/res/butterfly.png", 2438998, n => n < 2438998 / 4) // should download less than 25% of the file
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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, "test/res/butterfly.gif", 781223, n => n < 781223 / 4) // should download less than 25% of the file
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})
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slow()("emoji-sheet: entire file is read for static PNG", async t => {
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await runSingleTest(t, "test/res/RLMgJGfgTPjIQtvvWZsYjhjy.png", 11301, n => n === 11301) // should download entire file
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})
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