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test.js
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test.js
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/* global describe, it, beforeEach, afterEach*/
'use strict';
var assert = require('core-assert');
var Promise = require('./');
describe('Promise', function () {
it('should throw without new', function () {
assert.throws(function () {
/* eslint-disable new-cap */
var promise = Promise(function () {});
/* eslint-enable new-cap */
assert.ok(promise);
}, /Failed to construct 'Promise': Please use the 'new' operator, this object constructor cannot be called as a function\./);
});
it('should throw on invalid resolver type', function () {
assert.throws(function () {
var promise = new Promise('unicorns');
assert.ok(promise);
}, /Promise resolver unicorns is not a function/);
});
it('should reject on exception in resolver', function (done) {
new Promise(function () {
throw new Error('Bang!');
})
.catch(function (err) {
assert.equal(err.message, 'Bang!');
done();
});
});
it('should reject on exception in then', function (done) {
Promise.resolve(1)
.then(function () {
throw new Error('Bang!');
})
.catch(function (err) {
assert.equal(err.message, 'Bang!');
done();
});
});
it('should return Promise from resolve value', function (done) {
Promise.resolve(Promise.resolve(1))
.then(function (value) {
assert.equal(value, 1);
done();
});
});
// Is it really so? Seems like a bug
it('should resolve thenable in resolve', function (done) {
var thenable = {
then: function (cb) {
cb(thenable);
}
};
Promise.resolve(thenable).then(function (v) {
assert.equal(thenable, v);
done();
});
});
});
describe('Promise.all', function () {
it('should throw error on invalid argument', function () {
assert.throws(function () {
Promise.all('unicorns');
}, /You must pass an array to Promise.all()./);
});
it('should resolve empty array to empty array', function (done) {
Promise.all([]).then(function (value) {
assert.deepEqual(value, []);
done();
});
});
it('should resolve values to array', function (done) {
Promise.all([1, 2, 3]).then(function (value) {
assert.deepEqual(value, [1, 2, 3]);
done();
});
});
it('should resolve promises to array', function (done) {
Promise.all([1, 2, 3].map(Promise.resolve)).then(function (value) {
assert.deepEqual(value, [1, 2, 3]);
done();
});
});
it('should pass first rejected promise to onReject', function (done) {
Promise.all([Promise.resolve(1), Promise.reject(2), Promise.reject(3)]).then(function () {
done('onFullfil called');
}, function (reason) {
assert.deepEqual(reason, 2);
done();
});
});
});
function delayedResolve() {
return new Promise(function (resolve) {
setTimeout(resolve, 10);
});
}
describe('Promise.race', function () {
it('should throw error on invalid argument', function () {
assert.throws(function () {
Promise.race('unicorns');
}, /You must pass an array to Promise.race()./);
});
it('empty array should be pending', function (done) {
var p = Promise.race([]);
setTimeout(function () {
assert.deepEqual(p._state, 'pending');
done();
}, 5);
});
it('should resolve first value', function (done) {
Promise.race([1, 2, 3]).then(function (value) {
assert.deepEqual(value, 1);
done();
});
});
it('should resolve first promise', function (done) {
Promise.race([1, 2, 3].map(Promise.resolve)).then(function (value) {
assert.deepEqual(value, 1);
done();
});
});
it('should pass first rejected promise to onReject', function (done) {
Promise.race([delayedResolve(), delayedResolve(), Promise.reject(3)]).then(function () {
done('onFullfil called');
}, function (reason) {
assert.deepEqual(reason, 3);
done();
});
});
});
describe('unhandledRejection/rejectionHandled events', function () {
var slice = Array.prototype.slice;
var events;
function onUnhandledRejection(reason) {
var args = slice.call(arguments);
if (reason && reason.message) {
args[0] = reason.message;
}
events.push(['unhandledRejection', args]);
}
function onRejectionHandled() {
events.push(['rejectionHandled', slice.call(arguments)]);
}
beforeEach(function () {
events = [];
process.on('unhandledRejection', onUnhandledRejection);
process.on('rejectionHandled', onRejectionHandled);
});
afterEach(function () {
process.removeListener('unhandledRejection', onUnhandledRejection);
process.removeListener('rejectionHandled', onRejectionHandled);
});
it('should emit an unhandledRejection on the next turn', function (done) {
var promise = Promise.reject(new Error('next'));
assert.deepEqual(events, []);
nextLoop(function () {
assert.deepEqual(events, [
['unhandledRejection', ['next', promise]]
]);
done();
});
});
it('should not emit any events if handled before the next turn', function (done) {
var promise = Promise.reject(new Error('handled immediately after rejection'));
promise.catch(noop);
nextLoop(function () {
assert.deepEqual(events, []);
done();
});
});
it('should emit a rejectionHandled event if handledLater', function (done) {
var promise = Promise.reject(new Error('eventually handled'));
nextLoop(function () {
promise.catch(noop);
nextLoop(function () {
assert.deepEqual(events, [
['unhandledRejection', ['eventually handled', promise]],
['rejectionHandled', [promise]]
]);
done();
});
});
});
it('should not emit any events when handled by a chained promise', function (done) {
var promise = Promise.reject(new Error('chained'));
promise
.then(noop)
.then(noop)
.then(noop)
.catch(noop);
later(function () {
assert.deepStrictEqual(events, []);
done();
});
});
it('catch() should only emit rejectionHandled one branch of a forked promise chain at a time', function (done) {
var def = deferred();
var root = def.promise;
// build the first branch
root.then(noop).then(noop).catch(noop);
// build the second branch
var b1 = root.then(noop).then(noop);
def.reject(new Error('branching'));
var c;
later(step1);
function step1() {
b1.catch(noop);
c = root.then(noop);
later(step2);
}
function step2() {
assert.deepStrictEqual(events, [
['unhandledRejection', ['branching', b1]],
['rejectionHandled', [b1]],
['unhandledRejection', ['branching', c]]
]);
done();
}
});
function noop() {}
function nextLoop(fn) {
setImmediate(fn);
}
function later(fn) {
setTimeout(fn, 40);
}
});
function deferred() {
var resolve;
var reject;
var promise = new Promise(function (res, rej) {
resolve = res;
reject = rej;
});
return {
promise: promise,
resolve: resolve,
reject: reject
};
}
describe('Promises/A+ Tests', function () {
var adapter = {
deferred: deferred
};
require('promises-aplus-tests').mocha(adapter);
});