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<div class="content" data-ice="content"><h1 data-ice="title">spec-js/operators/startWith-spec.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">"use strict";
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {startWith} */
describe('Observable.prototype.startWith', function () {
var defaultStartValue = 'x';
asDiagram('startWith(s)')('should prepend to a cold Observable', function () {
var e1 = cold('---a--b--c--|');
var e1subs = '^ !';
var expected = 's--a--b--c--|';
expectObservable(e1.startWith('s')).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start an observable with given value', function () {
var e1 = hot('--a--|');
var e1subs = '^ !';
var expected = 'x-a--|';
expectObservable(e1.startWith(defaultStartValue)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with given value and does not completes if source does not completes', function () {
var e1 = hot('----a-');
var e1subs = '^ ';
var expected = 'x---a-';
expectObservable(e1.startWith(defaultStartValue)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with given value and does not completes if source never emits', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = 'x-';
expectObservable(e1.startWith(defaultStartValue)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with given value and completes if source does not emits', function () {
var e1 = hot('---|');
var e1subs = '^ !';
var expected = 'x--|';
expectObservable(e1.startWith(defaultStartValue)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with given value and complete immediately if source is empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '(x|)';
expectObservable(e1.startWith(defaultStartValue)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with given value and source both if source emits single value', function () {
var e1 = cold('(a|)');
var e1subs = '(^!)';
var expected = '(xa|)';
expectObservable(e1.startWith(defaultStartValue)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with given values when given value is more than one', function () {
var e1 = hot('-----a--|');
var e1subs = '^ !';
var expected = '(yz)-a--|';
expectObservable(e1.startWith('y', 'z')).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with given value and raises error if source raises error', function () {
var e1 = hot('--#');
var e1subs = '^ !';
var expected = 'x-#';
expectObservable(e1.startWith(defaultStartValue)).toBe(expected, defaultStartValue);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with given value and raises error immediately if source throws error', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '(x#)';
expectObservable(e1.startWith(defaultStartValue)).toBe(expected, defaultStartValue);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should allow unsubscribing explicitly and early', function () {
var e1 = hot('---a--b----c--d--|');
var unsub = ' ! ';
var e1subs = '^ ! ';
var expected = 's--a--b---';
var values = { s: 's', a: 'a', b: 'b' };
var result = e1.startWith('s', rxTestScheduler);
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = hot('---a--b----c--d--|');
var e1subs = '^ ! ';
var expected = 's--a--b--- ';
var unsub = ' ! ';
var values = { s: 's', a: 'a', b: 'b' };
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.startWith('s', rxTestScheduler)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should start with empty if given value is not specified', function () {
var e1 = hot('-a-|');
var e1subs = '^ !';
var expected = '-a-|';
expectObservable(e1.startWith(rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should accept scheduler as last argument with single value', function () {
var e1 = hot('--a--|');
var e1subs = '^ !';
var expected = 'x-a--|';
expectObservable(e1.startWith(defaultStartValue, rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should accept scheduler as last argument with multiple value', function () {
var e1 = hot('-----a--|');
var e1subs = '^ !';
var expected = '(yz)-a--|';
expectObservable(e1.startWith('y', 'z', rxTestScheduler)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
//# sourceMappingURL=startWith-spec.js.map</code></pre>
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