@reactivex/rxjs
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Reactive Extensions for modern JavaScript
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<div class="content" data-ice="content"><h1 data-ice="title">spec-js/observables/defer-spec.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {defer} */
describe('Observable.defer', function () {
asDiagram('defer(() => Observable.of(a, b, c))')('should defer the creation of a simple Observable', function () {
var expected = '-a--b--c--|';
var e1 = Observable.defer(function () { return cold('-a--b--c--|'); });
expectObservable(e1).toBe(expected);
});
it('should create an observable from the provided observable factory', function () {
var source = hot('--a--b--c--|');
var sourceSubs = '^ !';
var expected = '--a--b--c--|';
var e1 = Observable.defer(function () { return source; });
expectObservable(e1).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should create an observable from completed', function () {
var source = hot('|');
var sourceSubs = '(^!)';
var expected = '|';
var e1 = Observable.defer(function () { return source; });
expectObservable(e1).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should accept factory returns promise resolves', function (done) {
var expected = 42;
var e1 = Observable.defer(function () {
return new Promise(function (resolve) { resolve(expected); });
});
e1.subscribe(function (x) {
chai_1.expect(x).to.equal(expected);
done();
}, function (x) {
done(new Error('should not be called'));
});
});
it('should accept factory returns promise rejects', function (done) {
var expected = 42;
var e1 = Observable.defer(function () {
return new Promise(function (resolve, reject) { reject(expected); });
});
e1.subscribe(function (x) {
done(new Error('should not be called'));
}, function (x) {
chai_1.expect(x).to.equal(expected);
done();
}, function () {
done(new Error('should not be called'));
});
});
it('should create an observable from error', function () {
var source = hot('#');
var sourceSubs = '(^!)';
var expected = '#';
var e1 = Observable.defer(function () { return source; });
expectObservable(e1).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should create an observable when factory throws', function () {
var e1 = Observable.defer(function () {
throw 'error';
});
var expected = '#';
expectObservable(e1).toBe(expected);
});
it('should allow unsubscribing early and explicitly', function () {
var source = hot('--a--b--c--|');
var sourceSubs = '^ ! ';
var expected = '--a--b- ';
var unsub = ' ! ';
var e1 = Observable.defer(function () { return source; });
expectObservable(e1, 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--|');
var sourceSubs = '^ ! ';
var expected = '--a--b- ';
var unsub = ' ! ';
var e1 = Observable.defer(function () { return source.mergeMap(function (x) { return Observable.of(x); }); })
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(e1, unsub).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
});
//# sourceMappingURL=defer-spec.js.map</code></pre>
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