@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
224 lines • 9.83 kB
JavaScript
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var test_helper_1 = require('../helpers/test-helper');
var Observable = Rx.Observable;
/** @test {withLatestFrom} */
describe('Observable.prototype.withLatestFrom', function () {
asDiagram('withLatestFrom')('should combine events from cold observables', function () {
var e1 = hot('-a--b-----c-d-e-|');
var e2 = hot('--1--2-3-4---| ');
var expected = '----B-----C-D-E-|';
var result = e1.withLatestFrom(e2, function (a, b) { return String(a) + String(b); });
expectObservable(result).toBe(expected, { B: 'b1', C: 'c4', D: 'd4', E: 'e4' });
});
it('should merge the value with the latest values from the other observables into arrays', function () {
var e1 = hot('--a--^---b---c---d-|');
var e1subs = '^ !';
var e2 = hot('--e--^-f---g---h------|');
var e2subs = '^ !';
var e3 = hot('--i--^-j---k---l------|');
var e3subs = '^ !';
var expected = '----x---y---z-|';
var values = {
x: ['b', 'f', 'j'],
y: ['c', 'g', 'k'],
z: ['d', 'h', 'l']
};
var result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should merge the value with the latest values from the other observables into ' +
'arrays and a project argument', function () {
var e1 = hot('--a--^---b---c---d-|');
var e1subs = '^ !';
var e2 = hot('--e--^-f---g---h------|');
var e2subs = '^ !';
var e3 = hot('--i--^-j---k---l------|');
var e3subs = '^ !';
var expected = '----x---y---z-|';
var values = {
x: 'bfj',
y: 'cgk',
z: 'dhl'
};
var project = function (a, b, c) { return a + b + c; };
var result = e1.withLatestFrom(e2, e3, project);
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should allow unsubscribing early and explicitly', function () {
var e1 = hot('--a--^---b---c---d-|');
var e1subs = '^ ! ';
var e2 = hot('--e--^-f---g---h------|');
var e2subs = '^ ! ';
var e3 = hot('--i--^-j---k---l------|');
var e3subs = '^ ! ';
var expected = '----x---y--- ';
var unsub = ' ! ';
var values = {
x: 'bfj',
y: 'cgk',
z: 'dhl'
};
var project = function (a, b, c) { return a + b + c; };
var result = e1.withLatestFrom(e2, e3, project);
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = hot('--a--^---b---c---d-|');
var e1subs = '^ ! ';
var e2 = hot('--e--^-f---g---h------|');
var e2subs = '^ ! ';
var e3 = hot('--i--^-j---k---l------|');
var e3subs = '^ ! ';
var expected = '----x---y--- ';
var unsub = ' ! ';
var values = {
x: 'bfj',
y: 'cgk',
z: 'dhl'
};
var project = function (a, b, c) { return a + b + c; };
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.withLatestFrom(e2, e3, project)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var e2 = hot('--e--^-f---g---h----|');
var e2subs = '(^!)';
var e3 = hot('--i--^-j---k---l----|');
var e3subs = '(^!)';
var expected = '|'; // empty
var result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle never', function () {
var e1 = cold('-');
var e1subs = '^ ';
var e2 = hot('--e--^-f---g---h----|');
var e2subs = '^ !';
var e3 = hot('--i--^-j---k---l----|');
var e3subs = '^ !';
var expected = '--------------------'; // never
var result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle throw', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var e2 = hot('--e--^-f---g---h----|');
var e2subs = '(^!)';
var e3 = hot('--i--^-j---k---l----|');
var e3subs = '(^!)';
var expected = '#'; // throw
var result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle error', function () {
var e1 = hot('--a--^---b---#', undefined, new Error('boo-hoo'));
var e1subs = '^ !';
var e2 = hot('--e--^-f---g---h----|');
var e2subs = '^ !';
var e3 = hot('--i--^-j---k---l----|');
var e3subs = '^ !';
var expected = '----x---#'; // throw
var values = {
x: ['b', 'f', 'j']
};
var result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected, values, new Error('boo-hoo'));
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle error with project argument', function () {
var e1 = hot('--a--^---b---#', undefined, new Error('boo-hoo'));
var e1subs = '^ !';
var e2 = hot('--e--^-f---g---h----|');
var e2subs = '^ !';
var e3 = hot('--i--^-j---k---l----|');
var e3subs = '^ !';
var expected = '----x---#'; // throw
var values = {
x: 'bfj'
};
var project = function (a, b, c) { return a + b + c; };
var result = e1.withLatestFrom(e2, e3, project);
expectObservable(result).toBe(expected, values, new Error('boo-hoo'));
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle merging with empty', function () {
var e1 = hot('--a--^---b---c---d-| ');
var e1subs = '^ ! ';
var e2 = cold('|');
var e2subs = '(^!)';
var e3 = hot('--i--^-j---k---l------|');
var e3subs = '^ ! ';
var expected = '--------------| ';
var result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle merging with never', function () {
var e1 = hot('--a--^---b---c---d-| ');
var e1subs = '^ ! ';
var e2 = cold('-');
var e2subs = '^ ! ';
var e3 = hot('--i--^-j---k---l------|');
var e3subs = '^ ! ';
var expected = '--------------| ';
var result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle promises', function (done) {
Observable.of(1).delay(1).withLatestFrom(Promise.resolve(2), Promise.resolve(3))
.subscribe(function (x) {
chai_1.expect(x).to.deep.equal([1, 2, 3]);
}, null, done);
});
it('should handle arrays', function () {
Observable.of(1).delay(1).withLatestFrom([2, 3, 4], [4, 5, 6])
.subscribe(function (x) {
chai_1.expect(x).to.deep.equal([1, 4, 6]);
});
});
it('should handle lowercase-o observables', function () {
Observable.of(1).delay(1).withLatestFrom(test_helper_1.lowerCaseO(2, 3, 4), test_helper_1.lowerCaseO(4, 5, 6))
.subscribe(function (x) {
chai_1.expect(x).to.deep.equal([1, 4, 6]);
});
});
});
//# sourceMappingURL=withLatestFrom-spec.js.map