spec-js/operators/mergeScan-spec.js
"use strict";
var Rx = require('../../dist/package/Rx');
var Observable = Rx.Observable;
/** @test {mergeScan} */
describe('Observable.prototype.mergeScan', function () {
it('should mergeScan things', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '---u--v--w--x--y--z--|';
var values = {
u: ['b'],
v: ['b', 'c'],
w: ['b', 'c', 'd'],
x: ['b', 'c', 'd', 'e'],
y: ['b', 'c', 'd', 'e', 'f'],
z: ['b', 'c', 'd', 'e', 'f', 'g']
};
var source = e1.mergeScan(function (acc, x) { return Observable.of(acc.concat(x)); }, []);
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle errors', function () {
var e1 = hot('--a--^--b--c--d--#');
var e1subs = '^ !';
var expected = '---u--v--w--#';
var values = {
u: ['b'],
v: ['b', 'c'],
w: ['b', 'c', 'd']
};
var source = e1.mergeScan(function (acc, x) { return Observable.of(acc.concat(x)); }, []);
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should mergeScan values and be able to asynchronously project them', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '-----u--v--w--x--y--z|';
var values = {
u: ['b'],
v: ['b', 'c'],
w: ['b', 'c', 'd'],
x: ['b', 'c', 'd', 'e'],
y: ['b', 'c', 'd', 'e', 'f'],
z: ['b', 'c', 'd', 'e', 'f', 'g']
};
var source = e1.mergeScan(function (acc, x) {
return Observable.of(acc.concat(x)).delay(20, rxTestScheduler);
}, []);
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not stop ongoing async projections when source completes', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '--------u--v--w--x--y--(z|)';
var values = {
u: ['b'],
v: ['c'],
w: ['b', 'd'],
x: ['c', 'e'],
y: ['b', 'd', 'f'],
z: ['c', 'e', 'g'],
};
var source = e1.mergeScan(function (acc, x) {
return Observable.of(acc.concat(x)).delay(50, rxTestScheduler);
}, []);
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should interrupt ongoing async projections when result is unsubscribed early', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ ! ';
var expected = '--------u--v--w-- ';
var values = {
u: ['b'],
v: ['c'],
w: ['b', 'd'],
x: ['c', 'e'],
y: ['b', 'd', 'f'],
z: ['c', 'e', 'g'],
};
var source = e1.mergeScan(function (acc, x) {
return Observable.of(acc.concat(x)).delay(50, rxTestScheduler);
}, []);
expectObservable(source, e1subs).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ ! ';
var expected = '--------u--v--w-- ';
var unsub = ' ! ';
var values = {
u: ['b'],
v: ['c'],
w: ['b', 'd'],
x: ['c', 'e'],
y: ['b', 'd', 'f'],
z: ['c', 'e', 'g'],
};
var source = e1
.mergeMap(function (x) { return Observable.of(x); })
.mergeScan(function (acc, x) {
return Observable.of(acc.concat(x)).delay(50, rxTestScheduler);
}, [])
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(source, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle errors in the projection function', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '---u--v--#';
var values = {
u: ['b'],
v: ['b', 'c']
};
var source = e1.mergeScan(function (acc, x) {
if (x === 'd') {
throw 'bad!';
}
return Observable.of(acc.concat(x));
}, []);
expectObservable(source).toBe(expected, values, 'bad!');
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should propagate errors from the projected Observable', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '---#';
var source = e1.mergeScan(function (acc, x) { return Observable.throw('bad!'); }, []);
expectObservable(source).toBe(expected, undefined, 'bad!');
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle an empty projected Observable', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '---------------------(x|)';
var values = { x: [] };
var source = e1.mergeScan(function (acc, x) { return Observable.empty(); }, []);
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle a never projected Observable', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ ';
var expected = '----------------------';
var values = { x: [] };
var source = e1.mergeScan(function (acc, x) { return Observable.never(); }, []);
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('handle empty', function () {
var e1 = cold('|');
var e1subs = '(^!)';
var expected = '(u|)';
var values = {
u: []
};
var source = e1.mergeScan(function (acc, x) { return Observable.of(acc.concat(x)); }, []);
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('handle never', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
var source = e1.mergeScan(function (acc, x) { return Observable.of(acc.concat(x)); }, []);
expectObservable(source).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('handle throw', function () {
var e1 = cold('#');
var e1subs = '(^!)';
var expected = '#';
var source = e1.mergeScan(function (acc, x) { return Observable.of(acc.concat(x)); }, []);
expectObservable(source).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should mergeScan unsubscription', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var expected = '---u--v--w--x--';
var sub = '^ !';
var values = {
u: ['b'],
v: ['b', 'c'],
w: ['b', 'c', 'd'],
x: ['b', 'c', 'd', 'e'],
y: ['b', 'c', 'd', 'e', 'f'],
z: ['b', 'c', 'd', 'e', 'f', 'g']
};
var source = e1.mergeScan(function (acc, x) { return Observable.of(acc.concat(x)); }, []);
expectObservable(source, sub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(sub);
});
it('should mergescan projects cold Observable with single concurrency', function () {
var e1 = hot('--a--b--c--|');
var e1subs = '^ !';
var inner = [
cold('--d--e--f--| '),
cold('--g--h--i--| '),
cold('--j--k--l--|')
];
var xsubs = ' ^ !';
var ysubs = ' ^ !';
var zsubs = ' ^ !';
var expected = '--x-d--e--f--f-g--h--i--i-j--k--l--|';
var index = 0;
var source = e1.mergeScan(function (acc, x) {
var value = inner[index++];
return value.startWith(acc);
}, 'x', 1);
expectObservable(source).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(inner[0].subscriptions).toBe(xsubs);
expectSubscriptions(inner[1].subscriptions).toBe(ysubs);
expectSubscriptions(inner[2].subscriptions).toBe(zsubs);
});
it('should emit accumulator if inner completes without value', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '---------------------(x|)';
var source = e1.mergeScan(function (acc, x) { return Observable.empty(); }, ['1']);
expectObservable(source).toBe(expected, { x: ['1'] });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should emit accumulator if inner completes without value after source completes', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '-----------------------(x|)';
var source = e1.mergeScan(function (acc, x) {
return Observable.empty().delay(50, rxTestScheduler);
}, ['1']);
expectObservable(source).toBe(expected, { x: ['1'] });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should mergescan projects hot Observable with single concurrency', function () {
var e1 = hot('---a---b---c---|');
var e1subs = '^ !';
var inner = [
hot('--d--e--f--|'),
hot('----g----h----i----|'),
hot('------j------k-------l------|')
];
var xsubs = ' ^ !';
var ysubs = ' ^ !';
var zsubs = ' ^ !';
var expected = '---x-e--f--f--i----i-l------|';
var index = 0;
var source = e1.mergeScan(function (acc, x) {
var value = inner[index++];
return value.startWith(acc);
}, 'x', 1);
expectObservable(source).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(inner[0].subscriptions).toBe(xsubs);
expectSubscriptions(inner[1].subscriptions).toBe(ysubs);
expectSubscriptions(inner[2].subscriptions).toBe(zsubs);
});
it('should mergescan projects cold Observable with dual concurrency', function () {
var e1 = hot('----a----b----c----|');
var e1subs = '^ !';
var inner = [
cold('---d---e---f---| '),
cold('---g---h---i---| '),
cold('---j---k---l---|')
];
var xsubs = ' ^ !';
var ysubs = ' ^ !';
var zsubs = ' ^ !';
var expected = '----x--d-d-eg--fh--hi-j---k---l---|';
var index = 0;
var source = e1.mergeScan(function (acc, x) {
var value = inner[index++];
return value.startWith(acc);
}, 'x', 2);
expectObservable(source).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(inner[0].subscriptions).toBe(xsubs);
expectSubscriptions(inner[1].subscriptions).toBe(ysubs);
expectSubscriptions(inner[2].subscriptions).toBe(zsubs);
});
it('should mergescan projects hot Observable with dual concurrency', function () {
var e1 = hot('---a---b---c---|');
var e1subs = '^ !';
var inner = [
hot('--d--e--f--|'),
hot('----g----h----i----|'),
hot('------j------k-------l------|')
];
var xsubs = ' ^ !';
var ysubs = ' ^ !';
var zsubs = ' ^ !';
var expected = '---x-e-efh-h-ki------l------|';
var index = 0;
var source = e1.mergeScan(function (acc, x) {
var value = inner[index++];
return value.startWith(acc);
}, 'x', 2);
expectObservable(source).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(inner[0].subscriptions).toBe(xsubs);
expectSubscriptions(inner[1].subscriptions).toBe(ysubs);
expectSubscriptions(inner[2].subscriptions).toBe(zsubs);
});
});
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