spec-js/subjects/BehaviorSubject-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/package/Rx');
var BehaviorSubject = Rx.BehaviorSubject;
var Observable = Rx.Observable;
var ObjectUnsubscribedError = Rx.ObjectUnsubscribedError;
/** @test {BehaviorSubject} */
describe('BehaviorSubject', function () {
it('should extend Subject', function () {
var subject = new BehaviorSubject(null);
chai_1.expect(subject).to.be.instanceof(Rx.Subject);
});
it('should throw if it has received an error and getValue() is called', function () {
var subject = new BehaviorSubject(null);
subject.error(new Error('derp'));
chai_1.expect(function () {
subject.getValue();
}).to.throw(Error, 'derp');
});
it('should throw an ObjectUnsubscribedError if getValue() is called ' +
'and the BehaviorSubject has been unsubscribed', function () {
var subject = new BehaviorSubject('hi there');
subject.unsubscribe();
chai_1.expect(function () {
subject.getValue();
}).to.throw(ObjectUnsubscribedError);
});
it('should have a getValue() method to retrieve the current value', function () {
var subject = new BehaviorSubject('staltz');
chai_1.expect(subject.getValue()).to.equal('staltz');
subject.next('oj');
chai_1.expect(subject.getValue()).to.equal('oj');
});
it('should not allow you to set `value` directly', function () {
var subject = new BehaviorSubject('flibberty');
try {
// XXX: escape from readonly restriction for testing.
subject.value = 'jibbets';
}
catch (e) {
}
chai_1.expect(subject.getValue()).to.equal('flibberty');
chai_1.expect(subject.value).to.equal('flibberty');
});
it('should still allow you to retrieve the value from the value property', function () {
var subject = new BehaviorSubject('fuzzy');
chai_1.expect(subject.value).to.equal('fuzzy');
subject.next('bunny');
chai_1.expect(subject.value).to.equal('bunny');
});
it('should start with an initialization value', function (done) {
var subject = new BehaviorSubject('foo');
var expected = ['foo', 'bar'];
var i = 0;
subject.subscribe(function (x) {
chai_1.expect(x).to.equal(expected[i++]);
}, null, done);
subject.next('bar');
subject.complete();
});
it('should pump values to multiple subscribers', function (done) {
var subject = new BehaviorSubject('init');
var expected = ['init', 'foo', 'bar'];
var i = 0;
var j = 0;
subject.subscribe(function (x) {
chai_1.expect(x).to.equal(expected[i++]);
});
subject.subscribe(function (x) {
chai_1.expect(x).to.equal(expected[j++]);
}, null, done);
chai_1.expect(subject.observers.length).to.equal(2);
subject.next('foo');
subject.next('bar');
subject.complete();
});
it('should not pass values nexted after a complete', function () {
var subject = new BehaviorSubject('init');
var results = [];
subject.subscribe(function (x) {
results.push(x);
});
chai_1.expect(results).to.deep.equal(['init']);
subject.next('foo');
chai_1.expect(results).to.deep.equal(['init', 'foo']);
subject.complete();
chai_1.expect(results).to.deep.equal(['init', 'foo']);
subject.next('bar');
chai_1.expect(results).to.deep.equal(['init', 'foo']);
});
it('should clean out unsubscribed subscribers', function (done) {
var subject = new BehaviorSubject('init');
var sub1 = subject.subscribe(function (x) {
chai_1.expect(x).to.equal('init');
});
var sub2 = subject.subscribe(function (x) {
chai_1.expect(x).to.equal('init');
});
chai_1.expect(subject.observers.length).to.equal(2);
sub1.unsubscribe();
chai_1.expect(subject.observers.length).to.equal(1);
sub2.unsubscribe();
chai_1.expect(subject.observers.length).to.equal(0);
done();
});
it('should replay the previous value when subscribed', function () {
var behaviorSubject = new BehaviorSubject('0');
function feedNextIntoSubject(x) { behaviorSubject.next(x); }
function feedErrorIntoSubject(err) { behaviorSubject.error(err); }
function feedCompleteIntoSubject() { behaviorSubject.complete(); }
var sourceTemplate = '-1-2-3----4------5-6---7--8----9--|';
var subscriber1 = hot(' (a|) ').mergeMapTo(behaviorSubject);
var unsub1 = ' ! ';
var expected1 = ' 3---4------5-6-- ';
var subscriber2 = hot(' (b|) ').mergeMapTo(behaviorSubject);
var unsub2 = ' ! ';
var expected2 = ' 4----5-6---7-- ';
var subscriber3 = hot(' (c|) ').mergeMapTo(behaviorSubject);
var expected3 = ' 8---9--|';
expectObservable(hot(sourceTemplate).do(feedNextIntoSubject, feedErrorIntoSubject, feedCompleteIntoSubject)).toBe(sourceTemplate);
expectObservable(subscriber1, unsub1).toBe(expected1);
expectObservable(subscriber2, unsub2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
});
it('should emit complete when subscribed after completed', function () {
var behaviorSubject = new BehaviorSubject('0');
function feedNextIntoSubject(x) { behaviorSubject.next(x); }
function feedErrorIntoSubject(err) { behaviorSubject.error(err); }
function feedCompleteIntoSubject() { behaviorSubject.complete(); }
var sourceTemplate = '-1-2-3--4--|';
var subscriber1 = hot(' (a|)').mergeMapTo(behaviorSubject);
var expected1 = ' | ';
expectObservable(hot(sourceTemplate).do(feedNextIntoSubject, feedErrorIntoSubject, feedCompleteIntoSubject)).toBe(sourceTemplate);
expectObservable(subscriber1).toBe(expected1);
});
it('should be an Observer which can be given to Observable.subscribe', function (done) {
var source = Observable.of(1, 2, 3, 4, 5);
var subject = new BehaviorSubject(0);
var expected = [0, 1, 2, 3, 4, 5];
subject.subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, function (x) {
done(new Error('should not be called'));
}, function () {
done();
});
source.subscribe(subject);
});
});
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