promise-then.js - mozsearch

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load(libdir + "asserts.js");

ignoreUnhandledRejections();

const g = newGlobal({sameCompartmentAs: this});

let resolve, reject;

let promise = new Promise((resolveFn, rejectFn) => {

    resolve = resolveFn;

    reject = rejectFn;

});

// Set to a built-in Promise.prototype.then function, but from a different realm.

promise.then = g.Promise.prototype.then;

// Make SpeciesConstructor throw a TypeError exception.

promise.constructor = {

    [Symbol.species]: "not a constructor"

};

async function f(p) {

    await p;

let error;

f(promise).catch(e => { error = e; });

resolve(promise);

drainJobQueue();

assertEq(error.constructor === g.TypeError, true);