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<div class="content" data-ice="content"><h1 data-ice="title">spec-js/operators/takeLast-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 {takeLast} */
describe('Observable.prototype.takeLast', function () {
asDiagram('takeLast(2)')('should take two values of an observable with many values', function () {
var e1 = cold('--a-----b----c---d--| ');
var e1subs = '^ ! ';
var expected = '--------------------(cd|)';
expectObservable(e1.takeLast(2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take last three values', function () {
var e1 = cold('--a-----b----c---d--| ');
var e1subs = '^ ! ';
var expected = '--------------------(bcd|)';
expectObservable(e1.takeLast(3)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take all element when try to take larger then source', function () {
var e1 = cold('--a-----b----c---d--| ');
var e1subs = '^ ! ';
var expected = '--------------------(abcd|)';
expectObservable(e1.takeLast(5)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take all element when try to take exact', function () {
var e1 = cold('--a-----b----c---d--| ');
var e1subs = '^ ! ';
var expected = '--------------------(abcd|)';
expectObservable(e1.takeLast(4)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not take any values', function () {
var e1 = cold('--a-----b----c---d--|');
var expected = '|';
expectObservable(e1.takeLast(0)).toBe(expected);
});
it('should work with empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '|';
expectObservable(e1.takeLast(42)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should go on forever on never', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.takeLast(42)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should be empty on takeLast(0)', function () {
var e1 = hot('--a--^--b----c---d--|');
var e1subs = []; // Don't subscribe at all
var expected = '|';
expectObservable(e1.takeLast(0)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take one value from an observable with one value', function () {
var e1 = hot('---(a|)');
var e1subs = '^ ! ';
var expected = '---(a|)';
expectObservable(e1.takeLast(1)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take one value from an observable with many values', function () {
var e1 = hot('--a--^--b----c---d--| ');
var e1subs = '^ ! ';
var expected = '---------------(d|)';
expectObservable(e1.takeLast(1)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should error on empty', function () {
var e1 = hot('--a--^----|');
var e1subs = '^ !';
var expected = '-----|';
expectObservable(e1.takeLast(42)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should propagate error from the source observable', function () {
var e1 = hot('---^---#', null, 'too bad');
var e1subs = '^ !';
var expected = '----#';
expectObservable(e1.takeLast(42)).toBe(expected, null, 'too bad');
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should propagate error from an observable with values', function () {
var e1 = hot('---^--a--b--#');
var e1subs = '^ !';
var expected = '---------#';
expectObservable(e1.takeLast(42)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should allow unsubscribing explicitly and early', function () {
var e1 = hot('---^--a--b-----c--d--e--|');
var unsub = ' ! ';
var e1subs = '^ ! ';
var expected = '---------- ';
expectObservable(e1.takeLast(42), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should work with throw', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
expectObservable(e1.takeLast(42)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should throw if total is less than zero', function () {
chai_1.expect(function () { Observable.range(0, 10).takeLast(-1); })
.to.throw(Rx.ArgumentOutOfRangeError);
});
it('should not break unsubscription chain when unsubscribed explicitly', function () {
var e1 = hot('---^--a--b-----c--d--e--|');
var unsub = ' ! ';
var e1subs = '^ ! ';
var expected = '---------- ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.takeLast(42)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
//# sourceMappingURL=takeLast-spec.js.map</code></pre>
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