spec-js/operators/debounce-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {debounce} */
describe('Observable.prototype.debounce', function () {
function getTimerSelector(x) {
return function () { return Observable.timer(x, rxTestScheduler); };
}
asDiagram('debounce')('should debounce values by a specified cold Observable', function () {
var e1 = hot('-a--bc--d---|');
var e2 = cold('--| ');
var expected = '---a---c--d-|';
var result = e1.debounce(function () { return e2; });
expectObservable(result).toBe(expected);
});
it('should delay all element by selector observable', function () {
var e1 = hot('--a--b--c--d---------|');
var e1subs = '^ !';
var expected = '----a--b--c--d-------|';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should debounce by selector observable', function () {
var e1 = hot('--a--bc--d----|');
var e1subs = '^ !';
var expected = '----a---c--d--|';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should complete when source does not emit', function () {
var e1 = hot('-----|');
var e1subs = '^ !';
var expected = '-----|';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should complete when source is empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '|';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when source does not emit and raises error', function () {
var e1 = hot('-----#');
var e1subs = '^ !';
var expected = '-----#';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when source throws', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should allow unsubscribing early and explicitly', function () {
var e1 = hot('--a--bc--d----|');
var e1subs = '^ ! ';
var expected = '----a--- ';
var unsub = ' ! ';
var result = e1.debounce(getTimerSelector(20));
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chains when unsubscribed explicitly', function () {
var e1 = hot('--a--bc--d----|');
var e1subs = '^ ! ';
var expected = '----a--- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.debounce(getTimerSelector(20))
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should debounce and does not complete when source does not completes', function () {
var e1 = hot('--a--bc--d---');
var e1subs = '^ ';
var expected = '----a---c--d-';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not completes when source does not completes', function () {
var e1 = hot('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not completes when source never completes', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should delay all element until source raises error', function () {
var e1 = hot('--a--b--c--d---------#');
var e1subs = '^ !';
var expected = '----a--b--c--d-------#';
expectObservable(e1.debounce(getTimerSelector(20))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should debounce all elements while source emits by selector observable', function () {
var e1 = hot('---a---b---c---d---e|');
var e1subs = '^ !';
var expected = '--------------------(e|)';
expectObservable(e1.debounce(getTimerSelector(40))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should debounce all element while source emits by selector observable until raises error', function () {
var e1 = hot('--a--b--c--d-#');
var e1subs = '^ !';
var expected = '-------------#';
expectObservable(e1.debounce(getTimerSelector(50))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should delay element by same selector observable emits multiple', function () {
var e1 = hot('----a--b--c----d----e-------|');
var e1subs = '^ !';
var expected = '------a--b--c----d----e-----|';
var selector = cold('--x-y-');
var selectorSubs = [' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! '];
expectObservable(e1.debounce(function () { return selector; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
it('should debounce by selector observable emits multiple', function () {
var e1 = hot('----a--b--c----d----e-------|');
var e1subs = '^ !';
var expected = '------a-----c---------e-----|';
var selector = [cold('--x-y-'),
cold('----x-y-'),
cold('--x-y-'),
cold('------x-y-'),
cold('--x-y-')];
var selectorSubs = [' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! '];
expectObservable(e1.debounce(function () { return selector.shift(); })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var i = 0; i < selectorSubs.length; i++) {
expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
}
});
it('should debounce by selector observable until source completes', function () {
var e1 = hot('----a--b--c----d----e|');
var e1subs = '^ !';
var expected = '------a-----c--------(e|)';
var selector = [cold('--x-y-'),
cold('----x-y-'),
cold('--x-y-'),
cold('------x-y-'),
cold('--x-y-')];
var selectorSubs = [' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^!'];
expectObservable(e1.debounce(function () { return selector.shift(); })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var i = 0; i < selectorSubs.length; i++) {
expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
}
});
it('should raise error when selector observable raises error', function () {
var e1 = hot('--------a--------b--------c---------|');
var e1subs = '^ !';
var expected = '---------a---------b---------#';
var selector = [cold('-x-y-'),
cold('--x-y-'),
cold('---#')];
var selectorSubs = [' ^! ',
' ^ ! ',
' ^ !'];
expectObservable(e1.debounce(function () { return selector.shift(); })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var i = 0; i < selectorSubs.length; i++) {
expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
}
});
it('should raise error when source raises error with selector observable', function () {
var e1 = hot('--------a--------b--------c---------d#');
var e1subs = '^ !';
var expected = '---------a---------b---------c-------#';
var selector = [cold('-x-y-'),
cold('--x-y-'),
cold('---x-y-'),
cold('----x-y-')];
var selectorSubs = [' ^! ',
' ^ ! ',
' ^ ! ',
' ^!'];
expectObservable(e1.debounce(function () { return selector.shift(); })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var i = 0; i < selectorSubs.length; i++) {
expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
}
});
it('should raise error when selector function throws', function () {
var e1 = hot('--------a--------b--------c---------|');
var e1subs = '^ !';
var expected = '---------a---------b------#';
var selector = [cold('-x-y-'),
cold('--x-y-')];
var selectorSubs = [' ^! ',
' ^ ! '];
function selectorFunction(x) {
if (x !== 'c') {
return selector.shift();
}
else {
throw 'error';
}
}
expectObservable(e1.debounce(selectorFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var i = 0; i < selectorSubs.length; i++) {
expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
}
});
it('should mirror the source when given an empty selector Observable', function () {
var e1 = hot('--------a-x-yz---bxy---z--c--x--y--z|');
var e1subs = '^ !';
var expected = '--------a-x-yz---bxy---z--c--x--y--z|';
function selectorFunction(x) { return Observable.empty(); }
expectObservable(e1.debounce(selectorFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should ignore all values except last, when given a never selector Observable', function () {
var e1 = hot('--------a-x-yz---bxy---z--c--x--y--z|');
var e1subs = '^ !';
var expected = '------------------------------------(z|)';
function selectorFunction(x) { return Observable.never(); }
expectObservable(e1.debounce(selectorFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should delay element by selector observable completes when it does not emits', function () {
var e1 = hot('--------a--------b--------c---------|');
var e1subs = '^ !';
var expected = '---------a---------b---------c------|';
var selector = [cold('-|'),
cold('--|'),
cold('---|')];
var selectorSubs = [' ^! ',
' ^ ! ',
' ^ ! '];
expectObservable(e1.debounce(function () { return selector.shift(); })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var i = 0; i < selectorSubs.length; i++) {
expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
}
});
it('should debounce by selector observable completes when it does not emits', function () {
var e1 = hot('----a--b-c---------de-------------|');
var e1subs = '^ !';
var expected = '-----a------c------------e--------|';
var selector = [cold('-|'),
cold('--|'),
cold('---|'),
cold('----|'),
cold('-----|')];
var selectorSubs = [' ^! ',
' ^ ! ',
' ^ ! ',
' ^! ',
' ^ ! '];
expectObservable(e1.debounce(function () { return selector.shift(); })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
for (var i = 0; i < selectorSubs.length; i++) {
expectSubscriptions(selector[i].subscriptions).toBe(selectorSubs[i]);
}
});
it('should delay by promise resolves', function (done) {
var e1 = Observable.concat(Observable.of(1), Observable.timer(10).mapTo(2), Observable.timer(10).mapTo(3), Observable.timer(100).mapTo(4));
var expected = [1, 2, 3, 4];
e1.debounce(function () {
return new Promise(function (resolve) { resolve(42); });
}).subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, function (x) {
done(new Error('should not be called'));
}, function () {
chai_1.expect(expected.length).to.equal(0);
done();
});
});
it('should raises error when promise rejects', function (done) {
var e1 = Observable.concat(Observable.of(1), Observable.timer(10).mapTo(2), Observable.timer(10).mapTo(3), Observable.timer(100).mapTo(4));
var expected = [1, 2];
var error = new Error('error');
e1.debounce(function (x) {
if (x === 3) {
return new Promise(function (resolve, reject) { reject(error); });
}
else {
return new Promise(function (resolve) { resolve(42); });
}
}).subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, function (err) {
chai_1.expect(err).to.be.an('error', 'error');
chai_1.expect(expected.length).to.equal(0);
done();
}, function () {
done(new Error('should not be called'));
});
});
});
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