spec-js/operators/skipWhile-spec.js

"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/package/Rx');
var Observable = Rx.Observable;
/** @test {skipWhile} */
describe('Observable.prototype.skipWhile', function () {
    asDiagram('skipWhile(x => x < 4)')('should skip all elements until predicate is false', function () {
        var source = hot('-1-^2--3--4--5--6--|');
        var sourceSubs = '^               !';
        var expected = '-------4--5--6--|';
        var predicate = function (v) {
            return +v < 4;
        };
        expectObservable(source.skipWhile(predicate)).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should skip all elements with a true predicate', function () {
        var source = hot('-1-^2--3--4--5--6--|');
        var sourceSubs = '^               !';
        var expected = '----------------|';
        expectObservable(source.skipWhile(function () { return true; })).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should skip all elements with a truthy predicate', function () {
        var source = hot('-1-^2--3--4--5--6--|');
        var sourceSubs = '^               !';
        var expected = '----------------|';
        expectObservable(source.skipWhile(function () { return {}; })).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should not skip any element with a false predicate', function () {
        var source = hot('-1-^2--3--4--5--6--|');
        var sourceSubs = '^               !';
        var expected = '-2--3--4--5--6--|';
        expectObservable(source.skipWhile(function () { return false; })).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should not skip any elements with a falsy predicate', function () {
        var source = hot('-1-^2--3--4--5--6--|');
        var sourceSubs = '^               !';
        var expected = '-2--3--4--5--6--|';
        expectObservable(source.skipWhile(function () { return undefined; })).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should skip elements on hot source', function () {
        var source = hot('--1--2-^-3--4--5--6--7--8--');
        var sourceSubs = '^                   ';
        var expected = '--------5--6--7--8--';
        var predicate = function (v) {
            return +v < 5;
        };
        expectObservable(source.skipWhile(predicate)).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should be possible to skip using the element\'s index', function () {
        var source = hot('--a--b-^-c--d--e--f--g--h--|');
        var sourceSubs = '^                   !';
        var expected = '--------e--f--g--h--|';
        var predicate = function (v, index) {
            return index < 2;
        };
        expectObservable(source.skipWhile(predicate)).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should skip using index with source unsubscribes early', function () {
        var source = hot('--a--b-^-c--d--e--f--g--h--|');
        var sourceSubs = '^          !';
        var unsub = '-----------!';
        var expected = '-----d--e---';
        var predicate = function (v, index) {
            return index < 1;
        };
        expectObservable(source.skipWhile(predicate), unsub).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
        var source = hot('--a--b-^-c--d--e--f--g--h--|');
        var sourceSubs = '^          !';
        var expected = '-----d--e---';
        var unsub = '           !';
        var predicate = function (v, index) {
            return index < 1;
        };
        var result = source
            .mergeMap(function (x) { return Observable.of(x); })
            .skipWhile(predicate)
            .mergeMap(function (x) { return Observable.of(x); });
        expectObservable(result, unsub).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should skip using value with source throws', function () {
        var source = hot('--a--b-^-c--d--e--f--g--h--#');
        var sourceSubs = '^                   !';
        var expected = '-----d--e--f--g--h--#';
        var predicate = function (v) {
            return v !== 'd';
        };
        expectObservable(source.skipWhile(predicate)).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should invoke predicate while its false and never again', function () {
        var source = hot('--a--b-^-c--d--e--f--g--h--|');
        var sourceSubs = '^                   !';
        var expected = '--------e--f--g--h--|';
        var invoked = 0;
        var predicate = function (v) {
            invoked++;
            return v !== 'e';
        };
        expectObservable(source.skipWhile(predicate).do(null, null, function () {
            chai_1.expect(invoked).to.equal(3);
        })).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should handle predicate that throws', function () {
        var source = hot('--a--b-^-c--d--e--f--g--h--|');
        var sourceSubs = '^       !';
        var expected = '--------#';
        var predicate = function (v) {
            if (v === 'e') {
                throw new Error('nom d\'une pipe !');
            }
            return v !== 'f';
        };
        expectObservable(source.skipWhile(predicate)).toBe(expected, undefined, new Error('nom d\'une pipe !'));
        expectSubscriptions(source.subscriptions).toBe(sourceSubs);
    });
    it('should handle Observable.empty', function () {
        var source = cold('|');
        var subs = '(^!)';
        var expected = '|';
        expectObservable(source.skipWhile(function () { return true; })).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should handle Observable.never', function () {
        var source = cold('-');
        var subs = '^';
        var expected = '-';
        expectObservable(source.skipWhile(function () { return true; })).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
    it('should handle Observable.throw', function () {
        var source = cold('#');
        var subs = '(^!)';
        var expected = '#';
        expectObservable(source.skipWhile(function () { return true; })).toBe(expected);
        expectSubscriptions(source.subscriptions).toBe(subs);
    });
});
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