@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/operators/single-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 {single} */
describe('Observable.prototype.single', function () {
asDiagram('single')('should raise error from empty predicate if observable emits multiple time', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ ! ';
var expected = '-----# ';
var errorMsg = 'Sequence contains more than one element';
expectObservable(e1.single()).toBe(expected, null, errorMsg);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error from empty predicate if observable does not emit', function () {
var e1 = hot('--a--^--|');
var e1subs = '^ !';
var expected = '---#';
expectObservable(e1.single()).toBe(expected, null, new Rx.EmptyError());
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should return only element from empty predicate if observable emits only once', function () {
var e1 = hot('--a--|');
var e1subs = '^ !';
var expected = '-----(a|)';
expectObservable(e1.single()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should allow unsubscribing explicitly and early', function () {
var e1 = hot('--a--b--c--|');
var unsub = ' ! ';
var e1subs = '^ ! ';
var expected = '---- ';
expectObservable(e1.single(), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ ! ';
var expected = '---- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.single()
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error from empty predicate if observable emits error', function () {
var e1 = hot('--a--b^--#');
var e1subs = '^ !';
var expected = '---#';
expectObservable(e1.single()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error from predicate if observable emits error', function () {
var e1 = hot('--a--b^--#');
var e1subs = '^ !';
var expected = '---#';
var predicate = function (value) {
return value === 'c';
};
expectObservable(e1.single(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if predicate throws error', function () {
var e1 = hot('--a--b--c--d--|');
var e1subs = '^ ! ';
var expected = '-----------# ';
var predicate = function (value) {
if (value !== 'd') {
return false;
}
throw 'error';
};
expectObservable(e1.single(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should return element from predicate if observable have single matching element', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ !';
var expected = '-----------(b|)';
var predicate = function (value) {
return value === 'b';
};
expectObservable(e1.single(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error from predicate if observable have multiple matching element', function () {
var e1 = hot('--a--b--a--b--b--|');
var e1subs = '^ ! ';
var expected = '-----------# ';
var predicate = function (value) {
return value === 'b';
};
expectObservable(e1.single(predicate)).toBe(expected, null, 'Sequence contains more than one element');
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error from predicate if observable does not emit', function () {
var e1 = hot('--a--^--|');
var e1subs = '^ !';
var expected = '---#';
var predicate = function (value) {
return value === 'a';
};
expectObservable(e1.single(predicate)).toBe(expected, null, new Rx.EmptyError());
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should return undefined from predicate if observable does not contain matching element', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ !';
var expected = '-----------(z|)';
var predicate = function (value) {
return value === 'x';
};
expectObservable(e1.single(predicate)).toBe(expected, { z: undefined });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
//# sourceMappingURL=single-spec.js.map</code></pre>
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