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<div class="content" data-ice="content"><h1 data-ice="title">spec-js/operators/distinctUntilChanged-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 {distinctUntilChanged} */
describe('Observable.prototype.distinctUntilChanged', function () {
asDiagram('distinctUntilChanged')('should distinguish between values', function () {
var e1 = hot('-1--2-2----1-3-|');
var expected = '-1--2------1-3-|';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
});
it('should distinguish between values', function () {
var e1 = hot('--a--a--a--b--b--a--|');
var e1subs = '^ !';
var expected = '--a--------b-----a--|';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should distinguish between values and does not completes', function () {
var e1 = hot('--a--a--a--b--b--a-');
var e1subs = '^ ';
var expected = '--a--------b-----a-';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not completes if source never completes', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not completes if source does not completes', function () {
var e1 = hot('-');
var e1subs = '^';
var expected = '-';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should complete if source is empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '|';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should complete if source does not emit', function () {
var e1 = hot('------|');
var e1subs = '^ !';
var expected = '------|';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit if source emits single element only', function () {
var e1 = hot('--a--|');
var e1subs = '^ !';
var expected = '--a--|';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit if source is scalar', function () {
var e1 = Observable.of('a');
var expected = '(a|)';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
});
it('should raises error if source raises error', function () {
var e1 = hot('--a--a--#');
var e1subs = '^ !';
var expected = '--a-----#';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raises error if source throws', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not omit if source elements are all different', function () {
var e1 = hot('--a--b--c--d--e--f--|');
var e1subs = '^ !';
var expected = '--a--b--c--d--e--f--|';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should allow unsubscribing early and explicitly', function () {
var e1 = hot('--a--b--b--d--a--f--|');
var e1subs = '^ ! ';
var expected = '--a--b----- ';
var unsub = ' ! ';
var result = e1.distinctUntilChanged();
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chains when unsubscribed explicitly', function () {
var e1 = hot('--a--b--b--d--a--f--|');
var e1subs = '^ ! ';
var expected = '--a--b----- ';
var unsub = ' ! ';
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.distinctUntilChanged()
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit once if source elements are all same', function () {
var e1 = hot('--a--a--a--a--a--a--|');
var e1subs = '^ !';
var expected = '--a-----------------|';
expectObservable(e1.distinctUntilChanged()).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit once if comparator returns true always regardless of source emits', function () {
var e1 = hot('--a--b--c--d--e--f--|');
var e1subs = '^ !';
var expected = '--a-----------------|';
expectObservable(e1.distinctUntilChanged(function () { return true; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit all if comparator returns false always regardless of source emits', function () {
var e1 = hot('--a--a--a--a--a--a--|');
var e1subs = '^ !';
var expected = '--a--a--a--a--a--a--|';
expectObservable(e1.distinctUntilChanged(function () { return false; })).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should distinguish values by comparator', function () {
var e1 = hot('--a--b--c--d--e--f--|', { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 });
var e1subs = '^ !';
var expected = '--a-----c-----e-----|';
var comparator = function (x, y) { return y % 2 === 0; };
expectObservable(e1.distinctUntilChanged(comparator)).toBe(expected, { a: 1, c: 3, e: 5 });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raises error when comparator throws', function () {
var e1 = hot('--a--b--c--d--e--f--|');
var e1subs = '^ ! ';
var expected = '--a--b--c--# ';
var comparator = function (x, y) {
if (y === 'd') {
throw 'error';
}
return x === y;
};
expectObservable(e1.distinctUntilChanged(comparator)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should use the keySelector to pick comparator values', function () {
var e1 = hot('--a--b--c--d--e--f--|', { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 });
var e1subs = '^ !';
var expected = '--a--b-----d-----f--|';
var comparator = function (x, y) { return y % 2 === 1; };
var keySelector = function (x) { return x % 2; };
expectObservable(e1.distinctUntilChanged(comparator, keySelector)).toBe(expected, { a: 1, b: 2, d: 4, f: 6 });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raises error when keySelector throws', function () {
var e1 = hot('--a--b--c--d--e--f--|');
var e1subs = '^ ! ';
var expected = '--a--b--c--# ';
var keySelector = function (x) {
if (x === 'd') {
throw 'error';
}
return x;
};
expectObservable(e1.distinctUntilChanged(null, keySelector)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
//# sourceMappingURL=distinctUntilChanged-spec.js.map</code></pre>
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