spec-js/operators/exhaust-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {exhaust} */
describe('Observable.prototype.exhaust', function () {
asDiagram('exhaust')('should handle a hot observable of hot observables', function () {
var x = cold('--a---b---c--| ');
var y = cold('---d--e---f---| ');
var z = cold('---g--h---i---|');
var e1 = hot('------x-------y-----z-------------|', { x: x, y: y, z: z });
var expected = '--------a---b---c------g--h---i---|';
expectObservable(e1.exhaust()).toBe(expected);
});
it('should switch to first immediately-scheduled inner Observable', function () {
var e1 = cold('(ab|)');
var e1subs = '(^!)';
var e2 = cold('(cd|)');
var e2subs = [];
var expected = '(ab|)';
expectObservable(Observable.of(e1, e2).exhaust()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should handle throw', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '|';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle never', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a hot observable of observables', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---| ');
var ysubs = [];
var z = cold('---g--h---i---|');
var zsubs = ' ^ !';
var e1 = hot('------x-------y-----z-------------|', { x: x, y: y, z: z });
var expected = '--------a---b---c------g--h---i---|';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(z.subscriptions).toBe(zsubs);
});
it('should handle a hot observable of observables, outer is unsubscribed early', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = [];
var e1 = hot('------x-------y------| ', { x: x, y: y });
var unsub = ' ! ';
var expected = '--------a---b--- ';
expectObservable(e1.exhaust(), unsub).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = [];
var e1 = hot('------x-------y------| ', { x: x, y: y });
var unsub = ' ! ';
var expected = '--------a---b---- ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.exhaust()
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle a hot observable of observables, inner never completes', function () {
var x = cold('--a---b--| ');
var xsubs = ' ^ ! ';
var y = cold('-d---e- ');
var ysubs = [];
var z = cold('---f--g---h--');
var zsubs = ' ^ ';
var e1 = hot('---x---y------z----------| ', { x: x, y: y, z: z });
var expected = '-----a---b-------f--g---h--';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
expectSubscriptions(z.subscriptions).toBe(zsubs);
});
it('should handle a synchronous switch and stay on the first inner observable', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---| ');
var ysubs = [];
var e1 = hot('------(xy)------------|', { x: x, y: y });
var expected = '--------a---b---c-----|';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle a hot observable of observables, one inner throws', function () {
var x = cold('--a---# ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = [];
var e1 = hot('------x-------y------| ', { x: x, y: y });
var expected = '--------a---# ';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle a hot observable of observables, outer throws', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var y = cold('---d--e---f---|');
var ysubs = [];
var e1 = hot('------x-------y-------# ', { x: x, y: y });
var expected = '--------a---b---c-----# ';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
expectSubscriptions(y.subscriptions).toBe(ysubs);
});
it('should handle an empty hot observable', function () {
var e1 = hot('------|');
var e1subs = '^ !';
var expected = '------|';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a never hot observable', function () {
var e1 = hot('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should complete not before the outer completes', function () {
var x = cold('--a---b---c--| ');
var xsubs = ' ^ ! ';
var e1 = hot('------x---------------|', { x: x });
var expected = '--------a---b---c-----|';
expectObservable(e1.exhaust()).toBe(expected);
expectSubscriptions(x.subscriptions).toBe(xsubs);
});
it('should handle an observable of promises', function (done) {
var expected = [1];
Observable.of(Promise.resolve(1), Promise.resolve(2), Promise.resolve(3))
.exhaust()
.subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, null, function () {
chai_1.expect(expected.length).to.equal(0);
done();
});
});
it('should handle an observable of promises, where one rejects', function (done) {
Observable.of(Promise.reject(2), Promise.resolve(1))
.exhaust()
.subscribe(function (x) {
done(new Error('should not be called'));
}, function (err) {
chai_1.expect(err).to.equal(2);
done();
}, function () {
done(new Error('should not be called'));
});
});
});
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