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Edit File: throttleTime-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var chai_1 = require("chai");
var operators_1 = require("rxjs/operators");
var testing_1 = require("rxjs/testing");
var rxjs_1 = require("rxjs");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('throttleTime operator', function () {
    var rxTest;
    beforeEach(function () {
        rxTest = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    describe('default behavior { leading: true, trailing: false }', function () {
        it('should immediately emit the first value in each time window', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -a-x-y----b---x-cx---|');
                var expected = '-a--------b-----c----|';
                var subs = '    ^--------------------!';
                var result = e1.pipe((0, operators_1.throttleTime)(5, rxTest));
                expectObservable(result).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should throttle events by 5 time units', function (done) {
            (0, rxjs_1.of)(1, 2, 3)
                .pipe((0, operators_1.throttleTime)(5))
                .subscribe({
                next: function (x) {
                    (0, chai_1.expect)(x).to.equal(1);
                },
                complete: done,
            });
        });
        it('should throttle events multiple times', function () {
            var expected = ['1-0', '2-0'];
            (0, rxjs_1.concat)((0, rxjs_1.timer)(0, 1, rxTest).pipe((0, operators_1.take)(3), (0, operators_1.map)(function (x) { return '1-' + x; })), (0, rxjs_1.timer)(8, 1, rxTest).pipe((0, operators_1.take)(5), (0, operators_1.map)(function (x) { return '2-' + x; })))
                .pipe((0, operators_1.throttleTime)(5, rxTest))
                .subscribe(function (x) {
                (0, chai_1.expect)(x).to.equal(expected.shift());
            });
            rxTest.flush();
        });
        it('should simply mirror the source if values are not emitted often enough', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -a--------b-----c----|');
                var subs = '    ^--------------------!';
                var expected = '-a--------b-----c----|';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(5, rxTest))).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should handle a busy producer emitting a regular repeating sequence', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  abcdefabcdefabcdefabcdefa|');
                var subs = '    ^------------------------!';
                var expected = 'a-----a-----a-----a-----a|';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(5, rxTest))).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should complete when source does not emit', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -----|');
                var subs = '    ^----!';
                var expected = '-----|';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(5, rxTest))).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should raise error when source does not emit and raises error', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -----#');
                var subs = '    ^----!';
                var expected = '-----#';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(10, rxTest))).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should handle an empty source', function () {
            rxTest.run(function (_a) {
                var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = cold(' |');
                var subs = '    (^!)';
                var expected = '|';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(30, rxTest))).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should handle a never source', function () {
            rxTest.run(function (_a) {
                var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = cold(' -');
                var subs = '    ^';
                var expected = '-';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(30, rxTest))).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should handle a throw source', function () {
            rxTest.run(function (_a) {
                var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = cold(' #');
                var subs = '    (^!)';
                var expected = '#';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(30, rxTest))).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should throttle and does not complete when source does not completes', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -a--(bc)-------d----------------');
                var unsub = '   -------------------------------!';
                var subs = '    ^------------------------------!';
                var expected = '-a-------------d----------------';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(5, rxTest)), unsub).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -a--(bc)-------d----------------');
                var subs = '    ^------------------------------!';
                var expected = '-a-------------d----------------';
                var unsub = '   -------------------------------!';
                var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.throttleTime)(5, rxTest), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
                expectObservable(result, unsub).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
        it('should throttle values until source raises error', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -a--(bc)-------d---------------#');
                var subs = '    ^------------------------------!';
                var expected = '-a-------------d---------------#';
                expectObservable(e1.pipe((0, operators_1.throttleTime)(5, rxTest))).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(subs);
            });
        });
    });
    describe('throttleTime(fn, { leading: true, trailing: true })', function () {
        it('should immediately emit the first and last values in each time window', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -a-xy-----b--x--cxxx--|');
                var e1subs = '  ^---------------------!';
                var t = time('   ----|                 ');
                var expected = '-a---y----b---x---x---(x|)';
                var result = e1.pipe((0, operators_1.throttleTime)(t, rxTest, { leading: true, trailing: true }));
                expectObservable(result).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(e1subs);
            });
        });
        it('should emit the value if only a single one is given', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable;
                var e1 = hot('  -a--------------------|');
                var t = time('   ----|                 ');
                var expected = '-a--------------------|';
                var result = e1.pipe((0, operators_1.throttleTime)(t, rxTest, { leading: true, trailing: true }));
                expectObservable(result).toBe(expected);
            });
        });
    });
    describe('throttleTime(fn, { leading: false, trailing: true })', function () {
        it('should immediately emit the last value in each time window', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -a-xy-----b--x--cxxx--|');
                var e1subs = '  ^---------------------!';
                var t = time('   ----|                 ');
                var expected = '-----y--------x---x---(x|)';
                var result = e1.pipe((0, operators_1.throttleTime)(t, rxTest, { leading: false, trailing: true }));
                expectObservable(result).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(e1subs);
            });
        });
        it('should emit the last throttled value when complete', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
                var e1 = hot('  -a-xy-----b--x--cxx-|');
                var e1subs = '  ^-------------------!';
                var t = time('   ----|               ');
                var expected = '-----y--------x---x-|';
                var result = e1.pipe((0, operators_1.throttleTime)(t, rxTest, { leading: false, trailing: true }));
                expectObservable(result).toBe(expected);
                expectSubscriptions(e1.subscriptions).toBe(e1subs);
            });
        });
        it('should emit the value if only a single one is given', function () {
            rxTest.run(function (_a) {
                var hot = _a.hot, time = _a.time, expectObservable = _a.expectObservable;
                var e1 = hot('  -a--------------------|');
                var t = time('   ----|                 ');
                var expected = '-----a----------------|';
                var result = e1.pipe((0, operators_1.throttleTime)(t, rxTest, { leading: false, trailing: true }));
                expectObservable(result).toBe(expected);
            });
        });
    });
});
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