Move everything to src folder... it had to happen

src/m2d/converters/emoji-sheet.test.js

@@ -0,0 +1,58 @@
+const {test} = require("supertape")
+const {convertImageStream} = require("./emoji-sheet")
+const fs = require("fs")
+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} path
+ * @param {number} totalSize
+ * @param {number => boolean} sizeCheck
+ */
+async function runSingleTest(t, path, totalSize, sizeCheck) {
+	const file = fs.createReadStream(path)
+	const meter = new Meter()
+	const p = file.pipe(meter)
+	const result = await convertImageStream(p, () => {
+		file.pause()
+		file.emit("end")
+	})
+	t.equal(result.subarray(1, 4).toString("ascii"), "PNG", `test that this is a PNG file: ${result.toString("base64").slice(0, 100)}`)
+	/* c8 ignore next 5 */
+	if (sizeCheck(meter.bytes)) {
+		t.pass("read the correct amount of the file")
+	} else {
+		t.fail(`read too much or too little of the file, read: ${meter.bytes}, total: ${totalSize}`)
+	}
+}
+
+slow()("emoji-sheet: only partial file is read for APNG", async t => {
+	await runSingleTest(t, "test/res/butterfly.png", 2438998, n => n < 2438998 / 4) // should download less than 25% of the file
+})
+
+slow()("emoji-sheet: only partial file is read for GIF", async t => {
+	await runSingleTest(t, "test/res/butterfly.gif", 781223, n => n < 781223 / 4) // should download less than 25% of the file
+})
+
+slow()("emoji-sheet: entire file is read for static PNG", async t => {
+	await runSingleTest(t, "test/res/RLMgJGfgTPjIQtvvWZsYjhjy.png", 11301, n => n === 11301) // should download entire file
+})