Skip to content

Commit

Permalink
test(concat): add comprehensive tests for static concat
Browse files Browse the repository at this point in the history
  • Loading branch information
@staltz @benlesh
staltz authored and benlesh committed Nov 5, 2015
1 parent 8174947 commit f3638f8
Showing 1 changed file with 314 additions and 1 deletion.
315 changes: 314 additions & 1 deletion spec/observables/concat-spec.js
View file
Original file line number Diff line number Diff line change
@@ -1,14 +1,327 @@
/* globals describe, it, expect, expectObservable, cold */
/* globals describe, it, expect, expectObservable, expectSubscriptions, cold */
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
var immediateScheduler = Rx.Scheduler.immediate;

describe('Observable.concat', function () {
it('should emit elements from multiple sources', function () {
var e1 = cold('-a-b-c-|');
var e1subs = '^ !';
var e2 = cold('-0-1-|');
var e2subs = ' ^ !';
var e3 = cold('-w-x-y-z-|');
var e3subs = ' ^ !';
var expected = '-a-b-c--0-1--w-x-y-z-|';

expectObservable(Observable.concat(e1, e2, e3)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});

it('should concat the same cold observable multiple times', function () {
var inner = cold('--i-j-k-l-| ');
var innersubs = ['^ ! ',
' ^ ! ',
' ^ ! ',
' ^ !'];
var expected = '--i-j-k-l---i-j-k-l---i-j-k-l---i-j-k-l-|';

var result = Observable.concat(inner, inner, inner, inner);

expectObservable(result).toBe(expected);
expectSubscriptions(inner.subscriptions).toBe(innersubs);
});

it('should concat the same cold observable multiple times, ' +
'but the result is unsubscribed early', function () {
var inner = cold('--i-j-k-l-| ');
var unsub = ' !';
var innersubs = ['^ ! ',
' ^ !'];
var expected = '--i-j-k-l---i-j-';

var result = Observable.concat(inner, inner, inner, inner);

expectObservable(result, unsub).toBe(expected);
expectSubscriptions(inner.subscriptions).toBe(innersubs);
});

it('should complete without emit if both sources are empty', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold( '----|');
var e2subs = ' ^ !';
var expected = '------|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should not complete if first source does not completes', function () {
var e1 = cold('-');
var e1subs = '^';
var e2 = cold('--|');
var e2subs = [];
var expected = '-';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should not complete if second source does not completes', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold('---');
var e2subs = ' ^';
var expected = '---';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should not complete if both sources do not complete', function () {
var e1 = cold('-');
var e1subs = '^';
var e2 = cold('-');
var e2subs = [];
var expected = '-';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should raise error when first source is empty, second source raises error', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold( '----#');
var e2subs = ' ^ !';
var expected = '------#';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should raise error when first source raises error, second source is empty', function () {
var e1 = cold('---#');
var e1subs = '^ !';
var e2 = cold('----|');
var e2subs = [];
var expected = '---#';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should raise first error when both source raise error', function () {
var e1 = cold('---#');
var e1subs = '^ !';
var e2 = cold('------#');
var e2subs = [];
var expected = '---#';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should concat if first source emits once, second source is empty', function () {
var e1 = cold('--a--|');
var e1subs = '^ !';
var e2 = cold( '--------|');
var e2subs = ' ^ !';
var expected = '--a----------|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should concat if first source is empty, second source emits once', function () {
var e1 = cold('--|');
var e1subs = '^ !';
var e2 = cold( '--a--|');
var e2subs = ' ^ !';
var expected = '----a--|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should emit element from first source, and should not complete if second ' +
'source does not completes', function () {
var e1 = cold('--a--|');
var e1subs = '^ !';
var e2 = cold( '-');
var e2subs = ' ^';
var expected = '--a---';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should not complete if first source does not complete', function () {
var e1 = cold('-');
var e1subs = '^';
var e2 = cold('--a--|');
var e2subs = [];
var expected = '-';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should emit elements from each source when source emit once', function () {
var e1 = cold('---a|');
var e1subs = '^ !';
var e2 = cold( '-----b--|');
var e2subs = ' ^ !';
var expected = '---a-----b--|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should unsubscribe to inner source if outer is unsubscribed early', function () {
var e1 = cold('---a-a--a| ');
var e1subs = '^ ! ';
var e2 = cold( '-----b-b--b-|');
var e2subs = ' ^ ! ';
var unsub = ' ! ';
var expected = '---a-a--a-----b-b ';

expectObservable(Observable.concat(e1, e2), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should raise error from first source and does not emit from second source', function () {
var e1 = cold('--#');
var e1subs = '^ !';
var e2 = cold('----a--|');
var e2subs = [];
var expected = '--#';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should emit element from first source then raise error from second source', function () {
var e1 = cold('--a--|');
var e1subs = '^ !';
var e2 = cold( '-------#');
var e2subs = ' ^ !';
var expected = '--a---------#';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should emit all elements from both hot observable sources if first source ' +
'completes before second source starts emit', function () {
var e1 = hot('--a--b-|');
var e1subs = '^ !';
var e2 = hot('--------x--y--|');
var e2subs = ' ^ !';
var expected = '--a--b--x--y--|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should emit elements from second source regardless of completion time ' +
'when second source is cold observable', function () {
var e1 = hot('--a--b--c---|');
var e1subs = '^ !';
var e2 = cold('-x-y-z-|');
var e2subs = ' ^ !';
var expected = '--a--b--c----x-y-z-|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should not emit collapsing element from second source', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ !';
var e2 = hot('--------x--y--z--|');
var e2subs = ' ^ !';
var expected = '--a--b--c--y--z--|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should return empty if concatenating an empty source', function () {
var e1 = cold('|');
var e1subs = ['(^!)', '(^!)'];
var expected = '|';

var result = Observable.concat(e1, e1);

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});

it('should error immediately if given a just-throw source', function () {
var e1 = cold( '#');
var e1subs = '(^!)';
var expected = '#';

var result = Observable.concat(e1, e1);

expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});

it('should emit elements from second source regardless of completion time ' +
'when second source is cold observable', function () {
var e1 = hot('--a--b--c---|');
var e1subs = '^ !';
var e2 = cold('-x-y-z-|');
var e2subs = ' ^ !';
var expected = '--a--b--c----x-y-z-|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should not emit collapsing element from second source', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ !';
var e2 = hot('--------x--y--z--|');
var e2subs = ' ^ !';
var expected = '--a--b--c--y--z--|';

expectObservable(Observable.concat(e1, e2)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});

it('should concat an immediately-scheduled source with an immediately-scheduled second', function (done) {
var a = Observable.of(1, 2, 3, immediateScheduler);
var b = Observable.of(4, 5, 6, 7, 8, immediateScheduler);
var r = [1, 2, 3, 4, 5, 6, 7, 8];
var i = 0;

Observable.concat(a, b, immediateScheduler).subscribe(function (vals) {
expect(vals).toBe(r[i++]);
}, null, done);
});
});

0 comments on commit f3638f8

Please sign in to comment.