spec-js/operators/bufferWhen-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {bufferWhen} */
describe('Observable.prototype.bufferWhen', function () {
asDiagram('bufferWhen')('should emit buffers that close and reopen', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---------|');
var e2 = cold('--------------(s|)');
// --------------(s|)
var expected = '--------------x-------------y-----(z|)';
var values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g'],
z: []
};
expectObservable(e1.bufferWhen(function () { return e2; })).toBe(expected, values);
});
it('should emit buffers using constying cold closings', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
var subs = '^ ! ';
var closings = [
cold('---------------s--| '),
cold('----------(s|) '),
cold('-------------(s|)')];
var expected = '---------------x---------y---------(z|) ';
var values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g'],
z: ['h']
};
var i = 0;
var result = e1.bufferWhen(function () { return closings[i++]; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
});
it('should emit buffers using constying hot closings', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
var subs = '^ ! ';
var closings = [
{ obs: hot('-1--^--------------s---| '),
sub: '^ ! ' },
{ obs: hot('--1-^----3--------4----------s-| '),
sub: ' ^ ! ' },
{ obs: hot('1-2-^------3----4-------5--6-----------s--|'),
sub: ' ^ ! ' }]; // eslint-disable-line key-spacing
var expected = '---------------x---------y---------(z|)';
var values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g'],
z: ['h']
};
var i = 0;
var result = e1.bufferWhen(function () { return closings[i++].obs; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
for (var j = 0; j < closings.length; j++) {
expectSubscriptions(closings[j].obs.subscriptions).toBe(closings[j].sub);
}
});
it('should emit buffers using constying empty delayed closings', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
var subs = '^ ! ';
var closings = [
cold('---------------| '),
cold('----------| '),
cold('-------------|')];
var closeSubs = ['^ ! ',
' ^ ! ',
' ^ ! '];
var expected = '---------------x---------y---------(z|)';
var values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g'],
z: ['h']
};
var i = 0;
var result = e1.bufferWhen(function () { return closings[i++]; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
expectSubscriptions(closings[2].subscriptions).toBe(closeSubs[2]);
});
it('should emit buffers using constying cold closings, outer unsubscribed early', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
var unsub = ' ! ';
var subs = '^ ! ';
var closings = [
cold('---------------(s|) '),
cold('----------(s|) '),
cold('-------------(s|)')];
var closeSubs = ['^ ! ',
' ^ ! '];
var expected = '---------------x--- ';
var values = {
x: ['b', 'c', 'd']
};
var i = 0;
var result = e1.bufferWhen(function () { return closings[i++]; });
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
expectSubscriptions(closings[2].subscriptions).toBe([]);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
var subs = '^ ! ';
var closings = [
cold('---------------(s|) '),
cold('----------(s|) '),
cold('-------------(s|)')];
var closeSubs = ['^ ! ',
' ^ ! '];
var expected = '---------------x--- ';
var unsub = ' ! ';
var values = {
x: ['b', 'c', 'd']
};
var i = 0;
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.bufferWhen(function () { return closings[i++]; })
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
expectSubscriptions(closings[2].subscriptions).toBe([]);
});
it('should propagate error thrown from closingSelector', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
var subs = '^ ! ';
var closings = [
cold('---------------s--| '),
cold('----------(s|) '),
cold('-------------(s|)')];
var closeSubs0 = '^ ! ';
var expected = '---------------(x#) ';
var values = { x: ['b', 'c', 'd'] };
var i = 0;
var result = e1.bufferWhen(function () {
if (i === 1) {
throw 'error';
}
return closings[i++];
});
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs0);
});
it('should propagate error emitted from a closing', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------|');
var subs = '^ ! ';
var closings = [
cold('---------------s--| '),
cold('# ')];
var closeSubs = ['^ ! ',
' (^!) '];
var expected = '---------------(x#) ';
var values = { x: ['b', 'c', 'd'] };
var i = 0;
var result = e1.bufferWhen(function () { return closings[i++]; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
});
it('should propagate error emitted late from a closing', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------|');
var subs = '^ ! ';
var closings = [
cold('---------------s--| '),
cold('------# ')];
var closeSubs = ['^ ! ',
' ^ ! '];
var expected = '---------------x-----# ';
var values = { x: ['b', 'c', 'd'] };
var i = 0;
var result = e1.bufferWhen(function () { return closings[i++]; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
});
it('should handle errors', function () {
var e1 = hot('--a--^---b---c---d---e---f---#');
var e2 = cold('---------------(s|)');
// ---------------(s|)
var e2subs = ['^ ! ',
' ^ !'];
var expected = '---------------x--------#';
var values = {
x: ['b', 'c', 'd']
};
var result = e1.bufferWhen(function () { return e2; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should handle empty', function () {
var e1 = cold('|');
var e2 = cold('--------(s|)');
var e1subs = '(^!)';
var expected = '(x|)';
var values = {
x: []
};
var result = e1.bufferWhen(function () { return e2; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle throw', function () {
var e1 = cold('#');
var e2 = cold('--------(s|)');
var e1subs = '(^!)';
var expected = '#';
var values = {
x: []
};
var result = e1.bufferWhen(function () { return e2; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle never', function () {
var e1 = hot('-');
var unsub = ' !';
var e1subs = '^ !';
var e2 = cold('--------(s|) ');
var e2subs = ['^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ !'];
var expected = '--------x-------x-------x-------x-------x----';
var values = {
x: []
};
var source = e1.bufferWhen(function () { return e2; });
expectObservable(source, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should handle an inner never', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------|');
var e2 = cold('-');
var expected = '-----------------------------------(x|)';
var values = {
x: ['b', 'c', 'd', 'e', 'f', 'g', 'h']
};
expectObservable(e1.bufferWhen(function () { return e2; })).toBe(expected, values);
});
// bufferWhen is not supposed to handle a factory that returns always empty
// closing Observables, because doing such would constantly recreate a new
// buffer in a synchronous infinite loop until the stack overflows. This also
// happens with buffer in RxJS 4.
it('should NOT handle hot inner empty', function (done) {
var source = Observable.of(1, 2, 3, 4, 5, 6, 7, 8, 9);
var closing = Observable.empty();
var TOO_MANY_INVOCATIONS = 30;
source
.bufferWhen(function () { return closing; })
.takeWhile(function (val, index) { return index < TOO_MANY_INVOCATIONS; })
.subscribe(function (val) {
chai_1.expect(Array.isArray(val)).to.be.true;
chai_1.expect(val.length).to.equal(0);
}, function (err) {
done(new Error('should not be called'));
}, function () {
done();
});
});
it('should handle inner throw', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------|');
var e1subs = '(^!)';
var e2 = cold('#');
var e2subs = '(^!)';
var expected = '#';
var values = {
x: ['b', 'c', 'd', 'e', 'f', 'g', 'h']
};
var result = e1.bufferWhen(function () { return e2; });
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should handle disposing of source', function () {
var e1 = hot('--a--^---b---c---d---e---f---g---h------|');
var subs = '^ !';
var unsub = ' !';
var e2 = cold('---------------(s|)');
// ---------------(s|)
var expected = '---------------x-----';
var values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g', 'h'],
z: []
};
var source = e1.bufferWhen(function () { return e2; });
expectObservable(source, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
});
});
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