spec-js/observables/from-spec.js

"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {from} */
describe('Observable.from', function () {
    asDiagram('from([10, 20, 30])')('should create an observable from an array', function () {
        var e1 = Observable.from([10, 20, 30])
            .concatMap(function (x, i) { return Observable.of(x).delay(i === 0 ? 0 : 20, rxTestScheduler); });
        var expected = 'x-y-(z|)';
        expectObservable(e1).toBe(expected, { x: 10, y: 20, z: 30 });
    });
    it('should throw for non observable object', function () {
        var r = function () {
            Observable.from({}).subscribe();
        };
        chai_1.expect(r).to.throw();
    });
    it('should return T for ObservableLike objects', function () {
        type(function () {
            /* tslint:disable:no-unused-variable */
            var o1 = Observable.from([], Rx.Scheduler.asap);
            var o2 = Observable.from(Observable.empty());
            var o3 = Observable.from(new Promise(function (resolve) { return resolve(); }));
            /* tslint:enable:no-unused-variable */
        });
    });
    it('should return T for arrays', function () {
        type(function () {
            /* tslint:disable:no-unused-variable */
            var o1 = Observable.from([], Rx.Scheduler.asap);
            /* tslint:enable:no-unused-variable */
        });
    });
    var fakervable = function () {
        var values = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            values[_i - 0] = arguments[_i];
        }
        return ((_a = {},
            _a[Symbol.observable] = function () { return ({
                subscribe: function (observer) {
                    for (var _i = 0, values_1 = values; _i < values_1.length; _i++) {
                        var value = values_1[_i];
                        observer.next(value);
                    }
                    observer.complete();
                }
            }); },
            _a
        ));
        var _a;
    };
    var fakerator = function () {
        var values = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            values[_i - 0] = arguments[_i];
        }
        return ((_a = {},
            _a[Symbol.iterator] = function () {
                var clone = values.slice();
                return {
                    next: function () { return ({
                        done: clone.length <= 0,
                        value: clone.shift()
                    }); }
                };
            },
            _a
        ));
        var _a;
    };
    var sources = [
        { name: 'observable', value: Observable.of('x') },
        { name: 'observable-like', value: fakervable('x') },
        { name: 'array', value: ['x'] },
        { name: 'promise', value: Promise.resolve('x') },
        { name: 'iterator', value: fakerator('x') },
        { name: 'array-like', value: (_a = {}, _a[0] = 'x', _a.length = 1, _a) },
        { name: 'string', value: 'x' },
        { name: 'arguments', value: function (x) { return arguments; }('x') },
    ];
    var _loop_1 = function(source) {
        it("should accept " + source.name, function (done) {
            var nextInvoked = false;
            Observable.from(source.value)
                .subscribe(function (x) {
                nextInvoked = true;
                chai_1.expect(x).to.equal('x');
            }, function (x) {
                done(new Error('should not be called'));
            }, function () {
                chai_1.expect(nextInvoked).to.equal(true);
                done();
            });
        });
        it("should accept " + source.name + " and scheduler", function (done) {
            var nextInvoked = false;
            Observable.from(source.value, Rx.Scheduler.async)
                .subscribe(function (x) {
                nextInvoked = true;
                chai_1.expect(x).to.equal('x');
            }, function (x) {
                done(new Error('should not be called'));
            }, function () {
                chai_1.expect(nextInvoked).to.equal(true);
                done();
            });
            chai_1.expect(nextInvoked).to.equal(false);
        });
    };
    for (var _i = 0, sources_1 = sources; _i < sources_1.length; _i++) {
        var source = sources_1[_i];
        _loop_1(source);
    }
    var _a;
});
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