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Edit File: distinctUntilChanged-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var chai_1 = require("chai");
var operators_1 = require("rxjs/operators");
var rxjs_1 = require("rxjs");
var testing_1 = require("rxjs/testing");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('distinctUntilChanged', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    it('should distinguish between values', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -1--2-2----1-3-|');
            var e1subs = '  ^--------------!';
            var expected = '-1--2------1-3-|';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should distinguish between values', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--a--a--b--b--a--|');
            var e1subs = '  ^-------------------!';
            var expected = '--a--------b-----a--|';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should distinguish between values and does not complete', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--a--a--b--b--a-');
            var e1subs = '  ^------------------';
            var expected = '--a--------b-----a-';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not complete if source never completes', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' -');
            var e1subs = '  ^';
            var expected = '-';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not complete if source does not complete', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  -');
            var e1subs = '  ^';
            var expected = '-';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should complete if source is empty', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' |   ');
            var e1subs = '  (^!)';
            var expected = '|   ';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should complete if source does not emit', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  ------|');
            var e1subs = '  ^-----!';
            var expected = '------|';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should emit if source emits single element only', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--|');
            var e1subs = '  ^----!';
            var expected = '--a--|';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should emit if source is scalar', function () {
        testScheduler.run(function (_a) {
            var expectObservable = _a.expectObservable;
            var e1 = (0, rxjs_1.of)('a');
            var expected = '(a|)';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
        });
    });
    it('should raise error if source raises error', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--a--#');
            var e1subs = '  ^-------!';
            var expected = '--a-----#';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error if source throws', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' #   ');
            var e1subs = '  (^!)';
            var expected = '#   ';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not omit if source elements are all different', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d--e--f--|');
            var e1subs = '  ^-------------------!';
            var expected = '--a--b--c--d--e--f--|';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should allow unsubscribing early and explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--b--d--a--f--|');
            var e1subs = '  ^---------!          ';
            var expected = '--a--b-----          ';
            var unsub = '   ----------!          ';
            var result = e1.pipe((0, operators_1.distinctUntilChanged)());
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should not break unsubscription chains when unsubscribed explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--b--d--a--f--|');
            var e1subs = '  ^---------!          ';
            var expected = '--a--b-----          ';
            var unsub = '   ----------!          ';
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.distinctUntilChanged)(), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should emit once if source elements are all same', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--a--a--a--a--a--|');
            var e1subs = '  ^-------------------!';
            var expected = '--a-----------------|';
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)())).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should emit once if comparator returns true always regardless of source emits', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d--e--f--|');
            var e1subs = '  ^-------------------!';
            var expected = '--a-----------------|';
            var comparator = function () { return true; };
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)(comparator))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should emit all if comparator returns false always regardless of source emits', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--a--a--a--a--a--|');
            var e1subs = '  ^-------------------!';
            var expected = '--a--a--a--a--a--a--|';
            var comparator = function () { return false; };
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)(comparator))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should distinguish values by comparator', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d--e--f--|', { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 });
            var e1subs = '  ^-------------------!';
            var expected = '--a-----c-----e-----|';
            var comparator = function (x, y) { return y % 2 === 0; };
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)(comparator))).toBe(expected, { a: 1, c: 3, e: 5 });
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error when comparator throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d--e--f--|');
            var e1subs = '  ^----------!         ';
            var expected = '--a--b--c--#         ';
            var comparator = function (x, y) {
                if (y === 'd') {
                    throw 'error';
                }
                return x === y;
            };
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)(comparator))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should use the keySelector to pick comparator values', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d--e--f--|', { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 });
            var e1subs = '  ^-------------------!';
            var expected = '--a--b-----d-----f--|';
            var comparator = function (x, y) { return y % 2 === 1; };
            var keySelector = function (x) { return x % 2; };
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)(comparator, keySelector))).toBe(expected, { a: 1, b: 2, d: 4, f: 6 });
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should use the keySelector even for the first emit', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--|', { a: 2, b: 4 });
            var e1subs = '  ^-------!';
            var expected = '--a-----|';
            var keySelector = function (x) { return x % 2; };
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)(null, keySelector))).toBe(expected, { a: 2 });
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should raise error when keySelector throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --a--b--c--d--e--f--|');
            var e1subs = '  ^----------!         ';
            var expected = '--a--b--c--#         ';
            var keySelector = function (x) {
                if (x === 'd') {
                    throw 'error';
                }
                return x;
            };
            expectObservable(e1.pipe((0, operators_1.distinctUntilChanged)(null, keySelector))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should stop listening to a synchronous observable when unsubscribed', function () {
        var sideEffects = [];
        var synchronousObservable = new rxjs_1.Observable(function (subscriber) {
            for (var i = 0; !subscriber.closed && i < 10; i++) {
                sideEffects.push(i);
                subscriber.next(i);
            }
        });
        synchronousObservable.pipe((0, operators_1.distinctUntilChanged)(), (0, operators_1.take)(3)).subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
    it('should work properly with reentrant streams', function () {
        var subject = new rxjs_1.Subject();
        var results = [];
        var count = 0;
        subject.pipe((0, operators_1.distinctUntilChanged)()).subscribe(function (n) {
            results.push(n);
            if (++count > 2) {
                throw new Error('this should have only been hit once');
            }
            subject.next(1);
        });
        subject.next(1);
        (0, chai_1.expect)(results).to.deep.equal([1]);
    });
});
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