spec-js/operators/map-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/package/Rx');
var Observable = Rx.Observable;
// function shortcuts
var addDrama = function (x) { return x + '!'; };
var identity = function (x) { return x; };
var throwError = function () { throw new Error(); };
/** @test {map} */
describe('Observable.prototype.map', function () {
asDiagram('map(x => 10 * x)')('should map multiple values', function () {
var a = cold('--1--2--3--|');
var asubs = '^ !';
var expected = '--x--y--z--|';
var r = a.map(function (x) { return 10 * x; });
expectObservable(r).toBe(expected, { x: 10, y: 20, z: 30 });
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should map one value', function () {
var a = cold('--x--|', { x: 42 });
var asubs = '^ !';
var expected = '--y--|';
var r = a.map(addDrama);
expectObservable(r).toBe(expected, { y: '42!' });
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should throw an error if not passed a function', function () {
chai_1.expect(function () {
Observable.of(1, 2, 3).map('potato');
}).to.throw(TypeError, 'argument is not a function. Are you looking for `mapTo()`?');
});
it('should map multiple values', function () {
var a = cold('--1--2--3--|');
var asubs = '^ !';
var expected = '--x--y--z--|';
var r = a.map(addDrama);
expectObservable(r).toBe(expected, { x: '1!', y: '2!', z: '3!' });
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should propagate errors from map function', function () {
var a = cold('--x--|', { x: 42 });
var asubs = '^ ! ';
var expected = '--# ';
var r = a.map(function (x) {
throw 'too bad';
});
expectObservable(r).toBe(expected, null, 'too bad');
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should propagate errors from observable that emits only errors', function () {
var a = cold('#');
var asubs = '(^!)';
var expected = '#';
var r = a.map(identity);
expectObservable(r).toBe(expected);
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should propagate errors from observable that emit values', function () {
var a = cold('--a--b--#', { a: 1, b: 2 }, 'too bad');
var asubs = '^ !';
var expected = '--x--y--#';
var r = a.map(addDrama);
expectObservable(r).toBe(expected, { x: '1!', y: '2!' }, 'too bad');
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should propagate errors from subscribe', function () {
var r = function () {
Observable.of(1)
.map(identity)
.subscribe(throwError);
};
chai_1.expect(r).to.throw();
});
it('should not map an empty observable', function () {
var a = cold('|');
var asubs = '(^!)';
var expected = '|';
var invoked = 0;
var r = a
.map(function (x) { invoked++; return x; })
.do(null, null, function () {
chai_1.expect(invoked).to.equal(0);
});
expectObservable(r).toBe(expected);
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should allow unsubscribing explicitly and early', function () {
var a = cold('--1--2--3--|');
var unsub = ' ! ';
var asubs = '^ ! ';
var expected = '--x--y- ';
var r = a.map(addDrama);
expectObservable(r, unsub).toBe(expected, { x: '1!', y: '2!' });
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should map with index', function () {
var a = hot('-5-^-4--3---2----1--|');
var asubs = '^ !';
var expected = '--a--b---c----d--|';
var values = { a: 5, b: 14, c: 23, d: 32 };
var invoked = 0;
var r = a.map(function (x, index) {
invoked++;
return (parseInt(x) + 1) + (index * 10);
}).do(null, null, function () {
chai_1.expect(invoked).to.equal(4);
});
expectObservable(r).toBe(expected, values);
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should map with index until completed', function () {
var a = hot('-5-^-4--3---2----1--|');
var asubs = '^ !';
var expected = '--a--b---c----d--|';
var values = { a: 5, b: 14, c: 23, d: 32 };
var invoked = 0;
var r = a.map(function (x, index) {
invoked++;
return (parseInt(x) + 1) + (index * 10);
}).do(null, null, function () {
chai_1.expect(invoked).to.equal(4);
});
expectObservable(r).toBe(expected, values);
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should map with index until an error occurs', function () {
var a = hot('-5-^-4--3---2----1--#', undefined, 'too bad');
var asubs = '^ !';
var expected = '--a--b---c----d--#';
var values = { a: 5, b: 14, c: 23, d: 32 };
var invoked = 0;
var r = a.map(function (x, index) {
invoked++;
return (parseInt(x) + 1) + (index * 10);
}).do(null, null, function () {
chai_1.expect(invoked).to.equal(4);
});
expectObservable(r).toBe(expected, values, 'too bad');
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should map using a custom thisArg', function () {
var a = hot('-5-^-4--3---2----1--|');
var asubs = '^ !';
var expected = '--a--b---c----d--|';
var values = { a: 5, b: 14, c: 23, d: 32 };
var invoked = 0;
var foo = {
value: 42
};
var r = a
.map(function (x, index) {
invoked++;
chai_1.expect(this).to.equal(foo);
return (parseInt(x) + 1) + (index * 10);
}, foo)
.do(null, null, function () {
chai_1.expect(invoked).to.equal(4);
});
expectObservable(r).toBe(expected, values);
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should map twice', function () {
var a = hot('-0----1-^-2---3--4-5--6--7-8-|');
var asubs = '^ !';
var expected = '--a---b--c-d--e--f-g-|';
var values = { a: 2, b: 3, c: 4, d: 5, e: 6, f: 7, g: 8 };
var invoked1 = 0;
var invoked2 = 0;
var r = a
.map(function (x) { invoked1++; return parseInt(x) * 2; })
.map(function (x) { invoked2++; return x / 2; })
.do(null, null, function () {
chai_1.expect(invoked1).to.equal(7);
chai_1.expect(invoked2).to.equal(7);
});
expectObservable(r).toBe(expected, values);
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should do multiple maps using a custom thisArg', function () {
var a = hot('--1--2--3--4--|');
var asubs = '^ !';
var expected = '--a--b--c--d--|';
var values = { a: 11, b: 14, c: 17, d: 20 };
function Filterer() {
this.selector1 = function (x) { return parseInt(x) + 2; };
this.selector2 = function (x) { return parseInt(x) * 3; };
}
var filterer = new Filterer();
var r = a
.map(function (x) { return this.selector1(x); }, filterer)
.map(function (x) { return this.selector2(x); }, filterer)
.map(function (x) { return this.selector1(x); }, filterer);
expectObservable(r).toBe(expected, values);
expectSubscriptions(a.subscriptions).toBe(asubs);
});
it('should not break unsubscription chain when unsubscribed explicitly', function () {
var a = cold('--1--2--3--|');
var unsub = ' ! ';
var asubs = '^ ! ';
var expected = '--x--y- ';
var r = a
.mergeMap(function (x) { return Observable.of(x); })
.map(addDrama)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(r, unsub).toBe(expected, { x: '1!', y: '2!' });
expectSubscriptions(a.subscriptions).toBe(asubs);
});
});
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