qrloop/lib/__tests__/replicas.js

Envelop big blob of data into frames that can be displayed in series of QR Codes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const __1 = require("..");
test("'hello world' with 4 replicas", () => {
    const str = "hello world";
    const framesExport = (0, __1.dataToFrames)(Buffer.from(str), 200, 4);
    const firstScanned = (0, __1.parseFramesReducer)(null, framesExport[0]);
    expect((0, __1.areFramesComplete)(firstScanned)).toBe(true);
    expect((0, __1.progressOfFrames)(firstScanned)).toBe(1);
    expect((0, __1.currentNumberOfFrames)(firstScanned)).toBe((0, __1.totalNumberOfFrames)(firstScanned));
    expect((0, __1.framesToData)(firstScanned).toString()).toBe(str);
    const secondScanned = (0, __1.parseFramesReducer)(null, framesExport[1]);
    expect((0, __1.areFramesComplete)(secondScanned)).toBe(true);
    expect((0, __1.progressOfFrames)(secondScanned)).toBe(1);
    expect((0, __1.currentNumberOfFrames)(secondScanned)).toBe((0, __1.totalNumberOfFrames)(secondScanned));
    expect((0, __1.framesToData)(secondScanned).toString()).toBe(str);
    const allScanned = framesExport.reduce(__1.parseFramesReducer, undefined);
    expect((0, __1.areFramesComplete)(allScanned)).toBe(true);
    expect((0, __1.progressOfFrames)(allScanned)).toBe(1);
    expect((0, __1.currentNumberOfFrames)(allScanned)).toBe((0, __1.totalNumberOfFrames)(allScanned));
    expect((0, __1.framesToData)(allScanned).toString()).toBe(str);
});
test("1/3 of the frames dropped in the middle is enough to recover with at least 3 replicas", () => {
    const data = Buffer.from(Array(1000)
        .fill(null)
        .map((_, i) => i % 256));
    for (let replicas = 3; replicas < 10; replicas++) {
        let framesExport = (0, __1.dataToFrames)(data, 40, replicas);
        // drop 1/3 of the frames in the middle
        framesExport = framesExport
            .slice(0, Math.ceil(framesExport.length / 3))
            .concat(framesExport.slice(Math.floor((2 * framesExport.length) / 3)));
        const framesImport = framesExport.reduce(__1.parseFramesReducer, undefined);
        expect((0, __1.areFramesComplete)(framesImport)).toBe(true);
        expect((0, __1.progressOfFrames)(framesImport)).toBe(1);
        expect((0, __1.currentNumberOfFrames)(framesImport)).toBe((0, __1.totalNumberOfFrames)(framesImport));
        expect((0, __1.framesToData)(framesImport).toString("hex")).toBe(data.toString("hex"));
    }
});
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