@reactivex/rxjs/spec-js/observables/from-promise-spec.js

Reactive Extensions for modern JavaScript

"use strict";
var chai_1 = require('chai');
var sinon = require('sinon');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {fromPromise} */
describe('Observable.fromPromise', function () {
    it('should emit one value from a resolved promise', function (done) {
        var promise = Promise.resolve(42);
        Observable.fromPromise(promise)
            .subscribe(function (x) { chai_1.expect(x).to.equal(42); }, function (x) {
            done(new Error('should not be called'));
        }, function () {
            done();
        });
    });
    it('should raise error from a rejected promise', function (done) {
        var promise = Promise.reject('bad');
        Observable.fromPromise(promise)
            .subscribe(function (x) {
            done(new Error('should not be called'));
        }, function (e) {
            chai_1.expect(e).to.equal('bad');
            done();
        }, function () {
            done(new Error('should not be called'));
        });
    });
    it('should share the underlying promise with multiple subscribers', function (done) {
        var promise = Promise.resolve(42);
        var observable = Observable.fromPromise(promise);
        observable
            .subscribe(function (x) { chai_1.expect(x).to.equal(42); }, function (x) {
            done(new Error('should not be called'));
        }, null);
        setTimeout(function () {
            observable
                .subscribe(function (x) { chai_1.expect(x).to.equal(42); }, function (x) {
                done(new Error('should not be called'));
            }, function () {
                done();
            });
        });
    });
    it('should accept already-resolved Promise', function (done) {
        var promise = Promise.resolve(42);
        promise.then(function (x) {
            chai_1.expect(x).to.equal(42);
            Observable.fromPromise(promise)
                .subscribe(function (y) { chai_1.expect(y).to.equal(42); }, function (x) {
                done(new Error('should not be called'));
            }, function () {
                done();
            });
        }, function () {
            done(new Error('should not be called'));
        });
    });
    it('should emit a value from a resolved promise on a separate scheduler', function (done) {
        var promise = Promise.resolve(42);
        Observable.fromPromise(promise, Rx.Scheduler.asap)
            .subscribe(function (x) { chai_1.expect(x).to.equal(42); }, function (x) {
            done(new Error('should not be called'));
        }, function () {
            done();
        });
    });
    it('should raise error from a rejected promise on a separate scheduler', function (done) {
        var promise = Promise.reject('bad');
        Observable.fromPromise(promise, Rx.Scheduler.asap)
            .subscribe(function (x) { done(new Error('should not be called')); }, function (e) {
            chai_1.expect(e).to.equal('bad');
            done();
        }, function () {
            done(new Error('should not be called'));
        });
    });
    it('should share the underlying promise with multiple subscribers on a separate scheduler', function (done) {
        var promise = Promise.resolve(42);
        var observable = Observable.fromPromise(promise, Rx.Scheduler.asap);
        observable
            .subscribe(function (x) { chai_1.expect(x).to.equal(42); }, function (x) {
            done(new Error('should not be called'));
        }, null);
        setTimeout(function () {
            observable
                .subscribe(function (x) { chai_1.expect(x).to.equal(42); }, function (x) {
                done(new Error('should not be called'));
            }, function () {
                done();
            });
        });
    });
    it('should not emit, throw or complete if immediately unsubscribed', function (done) {
        var nextSpy = sinon.spy();
        var throwSpy = sinon.spy();
        var completeSpy = sinon.spy();
        var promise = Promise.resolve(42);
        var subscription = Observable.fromPromise(promise)
            .subscribe(nextSpy, throwSpy, completeSpy);
        subscription.unsubscribe();
        setTimeout(function () {
            chai_1.expect(nextSpy).not.have.been.called;
            chai_1.expect(throwSpy).not.have.been.called;
            chai_1.expect(completeSpy).not.have.been.called;
            done();
        });
    });
    if (typeof process === 'object' && Object.prototype.toString.call(process) === '[object process]') {
        it('should globally throw unhandled errors on process', function (done) {
            var originalException = process.listeners('uncaughtException');
            process.removeAllListeners('uncaughtException');
            process.once('uncaughtException', function (error) {
                chai_1.expect(error).to.be.an('error', 'fail');
                originalException.forEach(function (l) { return process.addListener('uncaughtException', l); });
                done();
            });
            Observable.fromPromise(Promise.reject('bad'))
                .subscribe(function (x) { done(new Error('should not be called')); }, function (e) {
                chai_1.expect(e).to.equal('bad');
                throw new Error('fail');
            }, function () {
                done(new Error('should not be called'));
            });
        });
    }
    else if (typeof window === 'object' &&
        (Object.prototype.toString.call(window) === '[object global]' || Object.prototype.toString.call(window) === '[object Window]')) {
        it('should globally throw unhandled errors on window', function (done) {
            var expected = ['Uncaught fail', 'fail', 'Script error.', 'uncaught exception: fail'];
            var current = window.onerror;
            window.onerror = null;
            var invoked = false;
            function onException(e) {
                if (invoked) {
                    return;
                }
                invoked = true;
                chai_1.expect(expected).to.contain(e);
                window.onerror = current;
                done();
            }
            window.onerror = onException;
            Observable.fromPromise(Promise.reject('bad'))
                .subscribe(function (x) { done(new Error('should not be called')); }, function (e) {
                chai_1.expect(e).to.equal('bad');
                throw 'fail';
            }, function () {
                done(new Error('should not be called'));
            });
        });
    }
});
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