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data-ice="title">spec-js/operators/distinct-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 {distinct} */ describe('Observable.prototype.distinct', function () { it('should distinguish between values', function () { var e1 = hot('--a--a--a--b--b--a--|'); var e1subs = '^ !'; var expected = '--a--------b--------|'; expectObservable(e1.distinct()).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-------'; expectObservable(e1.distinct()).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.distinct()).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.distinct()).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should complete if source is empty', function () { var e1 = cold('|'); var e1subs = '(^!)'; var expected = '|'; expectObservable(e1.distinct()).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.distinct()).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.distinct()).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.distinct()).toBe(expected); }); it('should raises error if source raises error', function () { var e1 = hot('--a--a--#'); var e1subs = '^ !'; var expected = '--a-----#'; expectObservable(e1.distinct()).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should raises error if source throws', function () { var e1 = cold('#'); var e1subs = '(^!)'; var expected = '#'; expectObservable(e1.distinct()).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.distinct()).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.distinct(); 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); }) .distinct() .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.distinct()).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should distinguish values by key', function () { var values = { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 }; var e1 = hot('--a--b--c--d--e--f--|', values); var e1subs = '^ !'; var expected = '--a--b--c-----------|'; var selector = function (value) { return value % 3; }; expectObservable(e1.distinct(selector)).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should raises error when selector throws', function () { var e1 = hot('--a--b--c--d--e--f--|'); var e1subs = '^ ! '; var expected = '--a--b--c--# '; var selector = function (value) { if (value === 'd') { throw new Error('d is for dumb'); } return value; }; expectObservable(e1.distinct(selector)).toBe(expected, undefined, new Error('d is for dumb')); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should support a flushing stream', function () { var e1 = hot('--a--b--a--b--a--b--|'); var e1subs = '^ !'; var e2 = hot('-----------x--------|'); var e2subs = '^ !'; var expected = '--a--b--------a--b--|'; expectObservable(e1.distinct(null, e2)).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it('should raise error if flush raises error', function () { var e1 = hot('--a--b--a--b--a--b--|'); var e1subs = '^ !'; var e2 = hot('-----------x-#'); var e2subs = '^ !'; var expected = '--a--b-------#'; expectObservable(e1.distinct(null, e2)).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it('should unsubscribe from the flushing stream when the main stream is unsubbed', function () { var e1 = hot('--a--b--a--b--a--b--|'); var e1subs = '^ ! '; var e2 = hot('-----------x--------|'); var e2subs = '^ ! '; var unsub = ' ! '; var expected = '--a--b------'; expectObservable(e1.distinct(null, e2), unsub).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it('should allow opting in to default comparator with flush', function () { var e1 = hot('--a--b--a--b--a--b--|'); var e1subs = '^ !'; var e2 = hot('-----------x--------|'); var e2subs = '^ !'; var expected = '--a--b--------a--b--|'; expectObservable(e1.distinct(null, e2)).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); }); //# sourceMappingURL=distinct-spec.js.map</code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>