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<div class="content" data-ice="content"><h1 data-ice="title">spec-js/operators/takeWhile-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 {takeWhile} */
describe('Observable.prototype.takeWhile', function () {
asDiagram('takeWhile(x => x < 4)')('should take all elements until predicate is false', function () {
var source = hot('-1-^2--3--4--5--6--|');
var sourceSubs = '^ ! ';
var expected = '-2--3--| ';
var result = source.takeWhile(function (v) { return +v < 4; });
expectObservable(result).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should take all elements with predicate returns true', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var e1subs = '^ !';
var expected = '--b--c--d--e--|';
expectObservable(e1.takeWhile(function () { return true; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take all elements with truthy predicate', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var e1subs = '^ !';
var expected = '--b--c--d--e--|';
expectObservable(e1.takeWhile((function () { return {}; }))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should skip all elements with predicate returns false', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var e1subs = '^ ! ';
var expected = '--| ';
expectObservable(e1.takeWhile(function () { return false; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should skip all elements with falsy predicate', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var e1subs = '^ ! ';
var expected = '--| ';
expectObservable(e1.takeWhile(function () { return null; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take all elements until predicate return false', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var e1subs = '^ ! ';
var expected = '--b--c--| ';
function predicate(value) {
return value !== 'd';
}
expectObservable(e1.takeWhile(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take elements with predicate when source does not complete', function () {
var e1 = hot('--a-^-b--c--d--e--');
var e1subs = '^ ';
var expected = '--b--c--d--e--';
expectObservable(e1.takeWhile(function () { return true; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete when source never completes', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
var result = e1.takeWhile(function () { return true; });
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should complete when source does not emit', function () {
var e1 = hot('--a-^------------|');
var e1subs = '^ !';
var expected = '-------------|';
expectObservable(e1.takeWhile(function () { return true; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should complete when source is empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '|';
var result = e1.takeWhile(function () { return true; });
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should pass element index to predicate', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var e1subs = '^ ! ';
var expected = '--b--c--| ';
function predicate(value, index) {
return index < 2;
}
expectObservable(e1.takeWhile(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when source raises error', function () {
var e1 = hot('--a-^-b--c--d--e--#');
var e1subs = '^ !';
var expected = '--b--c--d--e--#';
expectObservable(e1.takeWhile(function () { return true; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error when source throws', function () {
var source = cold('#');
var subs = '(^!)';
var expected = '#';
expectObservable(source.takeWhile(function () { return true; })).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(subs);
});
it('should invoke predicate until return false', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var e1subs = '^ ! ';
var expected = '--b--c--| ';
var invoked = 0;
function predicate(value) {
invoked++;
return value !== 'd';
}
var source = e1.takeWhile(predicate).do(null, null, function () {
chai_1.expect(invoked).to.equal(3);
});
expectObservable(source).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if predicate throws', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var e1subs = '^ ! ';
var expected = '--# ';
function predicate(value) {
throw 'error';
}
expectObservable(e1.takeWhile(predicate)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should take elements until unsubscribed', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var unsub = '-----! ';
var e1subs = '^ ! ';
var expected = '--b--- ';
function predicate(value) {
return value !== 'd';
}
expectObservable(e1.takeWhile(predicate), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chain when unsubscribed explicitly', function () {
var e1 = hot('--a-^-b--c--d--e--|');
var unsub = '-----! ';
var e1subs = '^ ! ';
var expected = '--b--- ';
function predicate(value) {
return value !== 'd';
}
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.takeWhile(predicate)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
//# sourceMappingURL=takeWhile-spec.js.map</code></pre>
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