@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/last-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');
/** @test {last} */
describe('Observable.prototype.last', function () {
asDiagram('last')('should take the last value of an observable', function () {
var e1 = hot('--a----b--c--|');
var e1subs = '^ !';
var expected = '-------------(c|)';
expectObservable(e1.last()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should error on nothing sent but completed', function () {
var e1 = hot('--a--^----|');
var e1subs = '^ !';
var expected = '-----#';
expectObservable(e1.last()).toBe(expected, null, new Rx.EmptyError());
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should error on empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '#';
expectObservable(e1.last()).toBe(expected, null, new Rx.EmptyError());
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should go on forever on never', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.last()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should return last element matches with predicate', function () {
var e1 = hot('--a--b--a--b--|');
var e1subs = '^ !';
var expected = '--------------(b|)';
var predicate = function (value) {
return value === 'b';
};
expectObservable(e1.last(predicate)).toBe(expected);
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 = '-------- ';
expectObservable(e1.last(), 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--d--|');
var e1subs = '^ ! ';
var expected = '-------- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Rx.Observable.of(x); })
.last()
.mergeMap(function (x) { return Rx.Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should return a default value if no element found', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '(a|)';
expectObservable(e1.last(null, null, 'a')).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not return default value if an element is found', function () {
var e1 = hot('--a---^---b---c---d---|');
var e1subs = '^ !';
var expected = '----------------(d|)';
expectObservable(e1.last(null, null, 'x')).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should support a result selector argument', function () {
var e1 = hot('--a--^---b---c---d---e--|');
var e1subs = '^ !';
var expected = '-------------------(x|)';
var predicate = function (x) { return x === 'c'; };
var resultSelector = function (x, i) {
chai_1.expect(i).to.equal(1);
chai_1.expect(x).to.equal('c');
return 'x';
};
expectObservable(e1.last(predicate, resultSelector)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when predicate throws', function () {
var e1 = hot('--a--^---b---c---d---e--|');
var e1subs = '^ ! ';
var expected = '--------# ';
var predicate = function (x) {
if (x === 'c') {
throw 'error';
}
else {
return false;
}
};
expectObservable(e1.last(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when result selector throws', function () {
var e1 = hot('--a--^---b---c---d---e--|');
var e1subs = '^ ! ';
var expected = '--------# ';
var predicate = function (x) { return x === 'c'; };
var resultSelector = function (x, i) {
throw 'error';
};
expectObservable(e1.last(predicate, resultSelector)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
//# sourceMappingURL=last-spec.js.map</code></pre>
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