spec-js/operators/catch-spec.js
"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();
});
});
});
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