scratch-vm/test/unit/blocks_event.js

const test = require('tap').test;

const Blocks = require('../../src/engine/blocks');
const BlockUtility = require('../../src/engine/block-utility');
const Event = require('../../src/blocks/scratch3_event');
const Runtime = require('../../src/engine/runtime');
const Target = require('../../src/engine/target');
const Thread = require('../../src/engine/thread');

test('#760 - broadcastAndWait', t => {
    const broadcastAndWaitBlock = {
        id: 'broadcastAndWaitBlock',
        fields: {
            BROADCAST_OPTION: {
                id: 'BROADCAST_OPTION',
                value: 'message'
            }
        },
        inputs: Object,
        block: 'fakeBlock',
        opcode: 'event_broadcastandwait',
        next: null,
        parent: null,
        shadow: false,
        topLevel: true,
        x: 0,
        y: 0
    };
    const receiveMessageBlock = {
        id: 'receiveMessageBlock',
        fields: {
            BROADCAST_OPTION: {
                id: 'BROADCAST_OPTION',
                value: 'message'
            }
        },
        inputs: Object,
        block: 'fakeBlock',
        opcode: 'event_whenbroadcastreceived',
        next: null,
        parent: null,
        shadow: false,
        topLevel: true,
        x: 0,
        y: 0
    };

    const rt = new Runtime();
    const e = new Event(rt);
    const b = new Blocks();
    b.createBlock(broadcastAndWaitBlock);
    b.createBlock(receiveMessageBlock);
    const tgt = new Target(rt, b);
    rt.targets.push(tgt);

    let th = rt._pushThread('broadcastAndWaitBlock', t);
    const util = new BlockUtility();
    util.sequencer = rt.sequencer;
    util.thread = th;

    // creates threads
    e.broadcastAndWait({BROADCAST_OPTION: 'message'}, util);
    t.strictEqual(rt.threads.length, 2);
    t.strictEqual(rt.threads[1].topBlock, 'receiveMessageBlock');
    // yields when some thread is active
    t.strictEqual(th.status, Thread.STATUS_YIELD);
    th.status = Thread.STATUS_RUNNING;
    e.broadcastAndWait({BROADCAST_OPTION: 'message'}, util);
    t.strictEqual(th.status, Thread.STATUS_YIELD);
    // does not yield once all threads are done
    th.status = Thread.STATUS_RUNNING;
    rt.threads[1].status = Thread.STATUS_DONE;
    e.broadcastAndWait({BROADCAST_OPTION: 'message'}, util);
    t.strictEqual(th.status, Thread.STATUS_RUNNING);

    // restarts done threads that are in runtime threads
    th = rt._pushThread('broadcastAndWaitBlock', tgt);
    util.thread = th;
    e.broadcastAndWait({BROADCAST_OPTION: 'message'}, util);
    t.strictEqual(rt.threads.length, 3);
    t.strictEqual(rt.threads[1].status, Thread.STATUS_RUNNING);
    t.strictEqual(th.status, Thread.STATUS_YIELD);
    // yields when some restarted thread is active
    th.status = Thread.STATUS_RUNNING;
    e.broadcastAndWait({BROADCAST_OPTION: 'message'}, util);
    t.strictEqual(th.status, Thread.STATUS_YIELD);
    // does not yield once all threads are done
    th.status = Thread.STATUS_RUNNING;
    rt.threads[1].status = Thread.STATUS_DONE;
    e.broadcastAndWait({BROADCAST_OPTION: 'message'}, util);
    t.strictEqual(th.status, Thread.STATUS_RUNNING);

    t.end();
});