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data-ice="title">spec-js/operators/catch-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 test_helper_1 = require('../helpers/test-helper'); var Observable = Rx.Observable; /** @test {catch} */ describe('Observable.prototype.catch', function () { asDiagram('catch')('should catch error and replace with a cold Observable', function () { var e1 = hot('--a--b--# '); var e2 = cold('-1-2-3-| '); var expected = '--a--b---1-2-3-|)'; var result = e1.catch(function (err) { return e2; }); expectObservable(result).toBe(expected); }); it('should catch error and replace it with Observable.of()', function () { var e1 = hot('--a--b--c--------|'); var subs = '^ !'; var expected = '--a--b--(XYZ|)'; var result = e1 .map(function (n) { if (n === 'c') { throw 'bad'; } return n; }) .catch(function (err) { return Observable.of('X', 'Y', 'Z'); }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(subs); }); it('should catch error and replace it with a cold Observable', function () { var e1 = hot('--a--b--# '); var e1subs = '^ ! '; var e2 = cold('1-2-3-4-5-|'); var e2subs = ' ^ !'; var expected = '--a--b--1-2-3-4-5-|'; var result = e1.catch(function (err) { return e2; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it('should allow unsubscribing explicitly and early', function () { var e1 = hot('--1-2-3-4-5-6---#'); var e1subs = '^ ! '; var expected = '--1-2-3- '; var unsub = ' ! '; var result = e1.catch(function () { return Observable.of('X', 'Y', 'Z'); }); expectObservable(result, unsub).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should not break unsubscription chain when unsubscribed explicitly', function () { var e1 = hot('--1-2-3-4-5-6---#'); var e1subs = '^ ! '; var expected = '--1-2-3- '; var unsub = ' ! '; var result = e1 .mergeMap(function (x) { return Observable.of(x); }) .catch(function () { return Observable.of('X', 'Y', 'Z'); }) .mergeMap(function (x) { return Observable.of(x); }); expectObservable(result, unsub).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should catch error and replace it with a hot Observable', function () { var e1 = hot('--a--b--# '); var e1subs = '^ ! '; var e2 = hot('1-2-3-4-5-6-7-8-9-|'); var e2subs = ' ^ !'; var expected = '--a--b--5-6-7-8-9-|'; var result = e1.catch(function (err) { return e2; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it('should catch and allow the cold observable to be repeated with the third ' + '(caught) argument', function () { var e1 = cold('--a--b--c--------| '); var subs = ['^ ! ', ' ^ ! ', ' ^ !']; var expected = '--a--b----a--b----a--b--#'; var retries = 0; var result = e1 .map(function (n) { if (n === 'c') { throw 'bad'; } return n; }) .catch(function (err, caught) { if (retries++ === 2) { throw 'done'; } return caught; }); expectObservable(result).toBe(expected, undefined, 'done'); expectSubscriptions(e1.subscriptions).toBe(subs); }); it('should catch and allow the hot observable to proceed with the third ' + '(caught) argument', function () { var e1 = hot('--a--b--c----d---|'); var subs = ['^ ! ', ' ^ !']; var expected = '--a--b-------d---|'; var retries = 0; var result = e1 .map(function (n) { if (n === 'c') { throw 'bad'; } return n; }) .catch(function (err, caught) { if (retries++ === 2) { throw 'done'; } return caught; }); expectObservable(result).toBe(expected, undefined, 'done'); expectSubscriptions(e1.subscriptions).toBe(subs); }); it('should catch and replace a Observable.throw() as the source', function () { var e1 = cold('#'); var subs = '(^!)'; var expected = '(abc|)'; var result = e1.catch(function (err) { return Observable.of('a', 'b', 'c'); }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(subs); }); it('should mirror the source if it does not raise errors', function () { var e1 = cold('--a--b--c--|'); var subs = '^ !'; var expected = '--a--b--c--|'; var result = e1.catch(function (err) { return Observable.of('x', 'y', 'z'); }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(subs); }); it('should complete if you return Observable.empty()', function () { var e1 = hot('--a--b--#'); var e1subs = '^ !'; var e2 = cold('|'); var e2subs = ' (^!)'; var expected = '--a--b--|'; var result = e1.catch(function () { return e2; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it('should raise error if you return Observable.throw()', function () { var e1 = hot('--a--b--#'); var e1subs = '^ !'; var e2 = cold('#'); var e2subs = ' (^!)'; var expected = '--a--b--#'; var result = e1.catch(function () { return e2; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it('should never terminate if you return Observable.never()', function () { var e1 = hot('--a--b--#'); var e1subs = '^ !'; var e2 = cold('-'); var e2subs = ' ^'; var expected = '--a--b---'; var result = e1.catch(function () { return e2; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it('should pass the error as the first argument', function (done) { Observable.throw('bad') .catch(function (err) { chai_1.expect(err).to.equal('bad'); return Observable.empty(); }) .subscribe(function () { //noop }, function (err) { done(new Error('should not be called')); }, function () { done(); }); }); it('should accept selector returns any ObservableInput', function (done) { var input$ = test_helper_1.createObservableInputs(42); input$.mergeMap(function (input) { return Observable.throw('bad').catch(function (err) { return input; }); }).subscribe(function (x) { chai_1.expect(x).to.be.equal(42); }, function (err) { done(new Error('should not be called')); }, function () { done(); }); }); }); //# sourceMappingURL=catch-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>