@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
150 lines • 6.82 kB
JavaScript
;
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/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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