@reactivex/rxjs/spec-js/operators/windowCount-spec.js

Reactive Extensions for modern JavaScript

"use strict";
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {windowCount} */
describe('Observable.prototype.windowCount', function () {
    asDiagram('windowCount(3)')('should emit windows with count 3, no skip specified', function () {
        var source = hot('---a---b---c---d---e---f---g---h---i---|');
        var sourceSubs = '^                                      !';
        var expected = 'x----------y-----------z-----------w---|';
        var x = cold('---a---b---(c|)                         ');
        var y = cold('----d---e---(f|)             ');
        var z = cold('----g---h---(i|) ');
        var w = cold('----|');
        var expectedValues = { x: x, y: y, z: z, w: w };
        var result = source.windowCount(3);
        expectObservable(result).toBe(expected, expectedValues);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should emit windows with count 2 and skip 1', function () {
        var source = hot('^-a--b--c--d--|');
        var subs = '^             !';
        var expected = 'u-v--x--y--z--|';
        var u = cold('--a--(b|)      ');
        var v = cold('---b--(c|)   ');
        var x = cold('---c--(d|)');
        var y = cold('---d--|');
        var z = cold('---|');
        var values = { u: u, v: v, x: x, y: y, z: z };
        var result = source.windowCount(2, 1);
        expectObservable(result).toBe(expected, values);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should emit windows with count 2, and skip unspecified', function () {
        var source = hot('--a--b--c--d--e--f--|');
        var subs = '^                   !';
        var expected = 'x----y-----z-----w--|';
        var x = cold('--a--(b|)            ');
        var y = cold('---c--(d|)      ');
        var z = cold('---e--(f|)');
        var w = cold('---|');
        var values = { x: x, y: y, z: z, w: w };
        var result = source.windowCount(2);
        expectObservable(result).toBe(expected, values);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should return empty if source is empty', function () {
        var source = cold('|');
        var subs = '(^!)';
        var expected = '(w|)';
        var w = cold('|');
        var values = { w: w };
        var result = source.windowCount(2, 1);
        expectObservable(result).toBe(expected, values);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should return Never if source if Never', function () {
        var source = cold('-');
        var subs = '^';
        var expected = 'w';
        var w = cold('-');
        var expectedValues = { w: w };
        var result = source.windowCount(2, 1);
        expectObservable(result).toBe(expected, expectedValues);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should propagate error from a just-throw source', function () {
        var source = cold('#');
        var subs = '(^!)';
        var expected = '(w#)';
        var w = cold('#');
        var expectedValues = { w: w };
        var result = source.windowCount(2, 1);
        expectObservable(result).toBe(expected, expectedValues);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should raise error if source raises error', function () {
        var source = hot('--a--b--c--d--e--f--#');
        var subs = '^                   !';
        var expected = 'u-v--w--x--y--z--q--#';
        var u = cold('--a--b--(c|)         ');
        var v = cold('---b--c--(d|)      ');
        var w = cold('---c--d--(e|)   ');
        var x = cold('---d--e--(f|)');
        var y = cold('---e--f--#');
        var z = cold('---f--#');
        var q = cold('---#');
        var values = { u: u, v: v, w: w, x: x, y: y, z: z, q: q };
        var result = source.windowCount(3, 1);
        expectObservable(result).toBe(expected, values);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should dispose of inner windows once outer is unsubscribed early', function () {
        var source = hot('^-a--b--c--d--|');
        var subs = '^        !     ';
        var expected = 'w-x--y--z-     ';
        var w = cold('--a--(b|)      ');
        var x = cold('---b--(c|)   ');
        var y = cold('---c-     ');
        var z = cold('--     ');
        var unsub = '         !     ';
        var values = { w: w, x: x, y: y, z: z };
        var result = source.windowCount(2, 1);
        expectObservable(result, unsub).toBe(expected, values);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
        var source = hot('^-a--b--c--d--|');
        var subs = '^        !     ';
        var expected = 'w-x--y--z-     ';
        var w = cold('--a--(b|)      ');
        var x = cold('---b--(c|)   ');
        var y = cold('---c-     ');
        var z = cold('--     ');
        var unsub = '         !     ';
        var values = { w: w, x: x, y: y, z: z };
        var result = source
            .mergeMap(function (x) { return Observable.of(x); })
            .windowCount(2, 1)
            .mergeMap(function (x) { return Observable.of(x); });
        expectObservable(result, unsub).toBe(expected, values);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
});
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