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spec-js/Observable-spec.js

"use strict";
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var chai_1 = require('chai');
var sinon = require('sinon');
var Rx = require('../dist/cjs/Rx');
var Subscriber = Rx.Subscriber;
var Observable = Rx.Observable;
function expectFullObserver(val) {
    chai_1.expect(val).to.be.a('object');
    chai_1.expect(val.next).to.be.a('function');
    chai_1.expect(val.error).to.be.a('function');
    chai_1.expect(val.complete).to.be.a('function');
    chai_1.expect(val.closed).to.be.a('boolean');
}
/** @test {Observable} */
describe('Observable', function () {
    it('should be constructed with a subscriber function', function (done) {
        var source = new Observable(function (observer) {
            expectFullObserver(observer);
            observer.next(1);
            observer.complete();
        });
        source.subscribe(function (x) { chai_1.expect(x).to.equal(1); }, null, done);
    });
    it('should send errors thrown in the constructor down the error path', function (done) {
        new Observable(function (observer) {
            throw new Error('this should be handled');
        })
            .subscribe({
            error: function (err) {
                chai_1.expect(err).to.deep.equal(new Error('this should be handled'));
                done();
            }
        });
    });
    describe('forEach', function () {
        it('should iterate and return a Promise', function (done) {
            var expected = [1, 2, 3];
            var result = Observable.of(1, 2, 3).forEach(function (x) {
                chai_1.expect(x).to.equal(expected.shift());
            }, Promise)
                .then(function () {
                done();
            });
            chai_1.expect(result.then).to.be.a('function');
        });
        it('should reject promise when in error', function (done) {
            Observable.throw('bad').forEach(function (x) {
                done(new Error('should not be called'));
            }, Promise).then(function () {
                done(new Error('should not complete'));
            }, function (err) {
                chai_1.expect(err).to.equal('bad');
                done();
            });
        });
        it('should allow Promise to be globally configured', function (done) {
            var wasCalled = false;
            __root__.Rx = {};
            __root__.Rx.config = {};
            __root__.Rx.config.Promise = function MyPromise(callback) {
                wasCalled = true;
                return new Promise(callback);
            };
            Observable.of(42).forEach(function (x) {
                chai_1.expect(x).to.equal(42);
            }).then(function () {
                chai_1.expect(wasCalled).to.be.true;
                delete __root__.Rx;
                done();
            });
        });
        it('should reject promise if nextHandler throws', function (done) {
            var results = [];
            Observable.of(1, 2, 3).forEach(function (x) {
                if (x === 3) {
                    throw new Error('NO THREES!');
                }
                results.push(x);
            }, Promise)
                .then(function () {
                done(new Error('should not be called'));
            }, function (err) {
                chai_1.expect(err).to.be.an('error', 'NO THREES!');
                chai_1.expect(results).to.deep.equal([1, 2]);
            }).then(function () {
                done();
            });
        });
        it('should handle a synchronous throw from the next handler and tear down', function (done) {
            var expected = new Error('I told, you Bobby Boucher, twos are the debil!');
            var unsubscribeCalled = false;
            var syncObservable = new Observable(function (observer) {
                observer.next(1);
                observer.next(2);
                observer.next(3);
                return function () {
                    unsubscribeCalled = true;
                };
            });
            var results = [];
            syncObservable.forEach(function (x) {
                results.push(x);
                if (x === 2) {
                    throw expected;
                }
            }).then(function () {
                done(new Error('should not be called'));
            }, function (err) {
                results.push(err);
                chai_1.expect(results).to.deep.equal([1, 2, expected]);
                chai_1.expect(unsubscribeCalled).to.be.true;
                done();
            });
        });
        it('should handle an asynchronous throw from the next handler and tear down', function (done) {
            var expected = new Error('I told, you Bobby Boucher, twos are the debil!');
            var unsubscribeCalled = false;
            var syncObservable = new Observable(function (observer) {
                var i = 1;
                var id = setInterval(function () { return observer.next(i++); }, 1);
                return function () {
                    clearInterval(id);
                    unsubscribeCalled = true;
                };
            });
            var results = [];
            syncObservable.forEach(function (x) {
                results.push(x);
                if (x === 2) {
                    throw expected;
                }
            }).then(function () {
                done(new Error('should not be called'));
            }, function (err) {
                results.push(err);
                chai_1.expect(results).to.deep.equal([1, 2, expected]);
                chai_1.expect(unsubscribeCalled).to.be.true;
                done();
            });
        });
    });
    describe('subscribe', function () {
        it('should be synchronous', function () {
            var subscribed = false;
            var nexted;
            var completed;
            var source = new Observable(function (observer) {
                subscribed = true;
                observer.next('wee');
                chai_1.expect(nexted).to.equal('wee');
                observer.complete();
                chai_1.expect(completed).to.be.true;
            });
            chai_1.expect(subscribed).to.be.false;
            var mutatedByNext = false;
            var mutatedByComplete = false;
            source.subscribe(function (x) {
                nexted = x;
                mutatedByNext = true;
            }, null, function () {
                completed = true;
                mutatedByComplete = true;
            });
            chai_1.expect(mutatedByNext).to.be.true;
            chai_1.expect(mutatedByComplete).to.be.true;
        });
        it('should work when subscribe is called with no arguments', function () {
            var source = new Observable(function (subscriber) {
                subscriber.next('foo');
                subscriber.complete();
            });
            source.subscribe();
        });
        it('should run unsubscription logic when an error is sent synchronously and subscribe is called with no arguments', function () {
            var unsubscribeCalled = false;
            var source = new Observable(function (subscriber) {
                subscriber.error(0);
                return function () {
                    unsubscribeCalled = true;
                };
            });
            try {
                source.subscribe();
            }
            catch (e) {
            }
            chai_1.expect(unsubscribeCalled).to.be.true;
        });
        it('should run unsubscription logic when an error is sent asynchronously and subscribe is called with no arguments', function (done) {
            var sandbox = sinon.sandbox.create();
            var fakeTimer = sandbox.useFakeTimers();
            var unsubscribeCalled = false;
            var source = new Observable(function (subscriber) {
                var id = setInterval(function () {
                    try {
                        subscriber.error(0);
                    }
                    catch (e) {
                    }
                }, 1);
                return function () {
                    clearInterval(id);
                    unsubscribeCalled = true;
                };
            });
            source.subscribe();
            setTimeout(function () {
                var err;
                var errHappened = false;
                try {
                    chai_1.expect(unsubscribeCalled).to.be.true;
                }
                catch (e) {
                    err = e;
                    errHappened = true;
                }
                finally {
                    if (!errHappened) {
                        done();
                    }
                    else {
                        done(err);
                    }
                }
            }, 100);
            fakeTimer.tick(110);
            sandbox.restore();
        });
        it('should return a Subscription that calls the unsubscribe function returned by the subscriber', function () {
            var unsubscribeCalled = false;
            var source = new Observable(function () {
                return function () {
                    unsubscribeCalled = true;
                };
            });
            var sub = source.subscribe(function () {
                //noop
            });
            chai_1.expect(sub instanceof Rx.Subscription).to.be.true;
            chai_1.expect(unsubscribeCalled).to.be.false;
            chai_1.expect(sub.unsubscribe).to.be.a('function');
            sub.unsubscribe();
            chai_1.expect(unsubscribeCalled).to.be.true;
        });
        it('should run unsubscription logic when an error is thrown sending messages synchronously', function () {
            var messageError = false;
            var messageErrorValue = false;
            var unsubscribeCalled = false;
            var sub;
            var source = new Observable(function (observer) {
                observer.next('boo!');
                return function () {
                    unsubscribeCalled = true;
                };
            });
            try {
                sub = source.subscribe(function (x) { throw x; });
            }
            catch (e) {
                messageError = true;
                messageErrorValue = e;
            }
            chai_1.expect(sub).to.be.a('undefined');
            chai_1.expect(unsubscribeCalled).to.be.true;
            chai_1.expect(messageError).to.be.true;
            chai_1.expect(messageErrorValue).to.equal('boo!');
        });
        it('should dispose of the subscriber when an error is thrown sending messages synchronously', function () {
            var messageError = false;
            var messageErrorValue = false;
            var unsubscribeCalled = false;
            var sub;
            var subscriber = new Subscriber(function (x) { throw x; });
            var source = new Observable(function (observer) {
                observer.next('boo!');
                return function () {
                    unsubscribeCalled = true;
                };
            });
            try {
                sub = source.subscribe(subscriber);
            }
            catch (e) {
                messageError = true;
                messageErrorValue = e;
            }
            chai_1.expect(sub).to.be.a('undefined');
            chai_1.expect(subscriber.closed).to.be.true;
            chai_1.expect(unsubscribeCalled).to.be.true;
            chai_1.expect(messageError).to.be.true;
            chai_1.expect(messageErrorValue).to.equal('boo!');
        });
        it('should ignore next messages after unsubscription', function () {
            var times = 0;
            new Observable(function (observer) {
                observer.next(0);
                observer.next(0);
                observer.next(0);
                observer.next(0);
            })
                .do(function () { return times += 1; })
                .subscribe(function () {
                if (times === 2) {
                    this.unsubscribe();
                }
            });
            chai_1.expect(times).to.equal(2);
        });
        it('should ignore error messages after unsubscription', function () {
            var times = 0;
            var errorCalled = false;
            new Observable(function (observer) {
                observer.next(0);
                observer.next(0);
                observer.next(0);
                observer.error(0);
            })
                .do(function () { return times += 1; })
                .subscribe(function () {
                if (times === 2) {
                    this.unsubscribe();
                }
            }, function () { errorCalled = true; });
            chai_1.expect(times).to.equal(2);
            chai_1.expect(errorCalled).to.be.false;
        });
        it('should ignore complete messages after unsubscription', function () {
            var times = 0;
            var completeCalled = false;
            new Observable(function (observer) {
                observer.next(0);
                observer.next(0);
                observer.next(0);
                observer.complete();
            })
                .do(function () { return times += 1; })
                .subscribe(function () {
                if (times === 2) {
                    this.unsubscribe();
                }
            }, null, function () { completeCalled = true; });
            chai_1.expect(times).to.equal(2);
            chai_1.expect(completeCalled).to.be.false;
        });
        describe('when called with an anonymous observer', function () {
            it('should accept an anonymous observer with just a next function and call the next function in the context' +
                ' of the anonymous observer', function (done) {
                //intentionally not using lambda to avoid typescript's this context capture
                var o = {
                    next: function next(x) {
                        chai_1.expect(this).to.equal(o);
                        chai_1.expect(x).to.equal(1);
                        done();
                    }
                };
                Observable.of(1).subscribe(o);
            });
            it('should accept an anonymous observer with just an error function and call the error function in the context' +
                ' of the anonymous observer', function (done) {
                //intentionally not using lambda to avoid typescript's this context capture
                var o = {
                    error: function error(err) {
                        chai_1.expect(this).to.equal(o);
                        chai_1.expect(err).to.equal('bad');
                        done();
                    }
                };
                Observable.throw('bad').subscribe(o);
            });
            it('should accept an anonymous observer with just a complete function and call the complete function in the' +
                ' context of the anonymous observer', function (done) {
                //intentionally not using lambda to avoid typescript's this context capture
                var o = {
                    complete: function complete() {
                        chai_1.expect(this).to.equal(o);
                        done();
                    }
                };
                Observable.empty().subscribe(o);
            });
            it('should accept an anonymous observer with no functions at all', function () {
                chai_1.expect(function () {
                    Observable.empty().subscribe({});
                }).not.to.throw();
            });
            it('should run unsubscription logic when an error is thrown sending messages synchronously to an' +
                ' anonymous observer', function () {
                var messageError = false;
                var messageErrorValue = false;
                var unsubscribeCalled = false;
                //intentionally not using lambda to avoid typescript's this context capture
                var o = {
                    next: function next(x) {
                        chai_1.expect(this).to.equal(o);
                        throw x;
                    }
                };
                var sub;
                var source = new Observable(function (observer) {
                    observer.next('boo!');
                    return function () {
                        unsubscribeCalled = true;
                    };
                });
                try {
                    sub = source.subscribe(o);
                }
                catch (e) {
                    messageError = true;
                    messageErrorValue = e;
                }
                chai_1.expect(sub).to.be.a('undefined');
                chai_1.expect(unsubscribeCalled).to.be.true;
                chai_1.expect(messageError).to.be.true;
                chai_1.expect(messageErrorValue).to.equal('boo!');
            });
            it('should ignore next messages after unsubscription', function () {
                var times = 0;
                new Observable(function (observer) {
                    observer.next(0);
                    observer.next(0);
                    observer.next(0);
                    observer.next(0);
                })
                    .do(function () { return times += 1; })
                    .subscribe({
                    next: function () {
                        if (times === 2) {
                            this.unsubscribe();
                        }
                    }
                });
                chai_1.expect(times).to.equal(2);
            });
            it('should ignore error messages after unsubscription', function () {
                var times = 0;
                var errorCalled = false;
                new Observable(function (observer) {
                    observer.next(0);
                    observer.next(0);
                    observer.next(0);
                    observer.error(0);
                })
                    .do(function () { return times += 1; })
                    .subscribe({
                    next: function () {
                        if (times === 2) {
                            this.unsubscribe();
                        }
                    },
                    error: function () { errorCalled = true; }
                });
                chai_1.expect(times).to.equal(2);
                chai_1.expect(errorCalled).to.be.false;
            });
            it('should ignore complete messages after unsubscription', function () {
                var times = 0;
                var completeCalled = false;
                new Observable(function (observer) {
                    observer.next(0);
                    observer.next(0);
                    observer.next(0);
                    observer.complete();
                })
                    .do(function () { return times += 1; })
                    .subscribe({
                    next: function () {
                        if (times === 2) {
                            this.unsubscribe();
                        }
                    },
                    complete: function () { completeCalled = true; }
                });
                chai_1.expect(times).to.equal(2);
                chai_1.expect(completeCalled).to.be.false;
            });
        });
    });
});
/** @test {Observable} */
describe('Observable.create', function () {
    asDiagram('create(obs => { obs.next(1); })')('should create a cold observable that emits just 1', function () {
        var e1 = Observable.create(function (obs) { obs.next(1); });
        var expected = 'x';
        expectObservable(e1).toBe(expected, { x: 1 });
    });
    it('should create an Observable', function () {
        var result = Observable.create(function () {
            //noop
        });
        chai_1.expect(result instanceof Observable).to.be.true;
    });
    it('should provide an observer to the function', function () {
        var called = false;
        var result = Observable.create(function (observer) {
            called = true;
            expectFullObserver(observer);
            observer.complete();
        });
        chai_1.expect(called).to.be.false;
        result.subscribe(function () {
            //noop
        });
        chai_1.expect(called).to.be.true;
    });
    it('should send errors thrown in the passed function down the error path', function (done) {
        Observable.create(function (observer) {
            throw new Error('this should be handled');
        })
            .subscribe({
            error: function (err) {
                chai_1.expect(err).to.deep.equal(new Error('this should be handled'));
                done();
            }
        });
    });
});
/** @test {Observable} */
describe('Observable.lift', function () {
    var MyCustomObservable = (function (_super) {
        __extends(MyCustomObservable, _super);
        function MyCustomObservable() {
            _super.apply(this, arguments);
        }
        MyCustomObservable.from = function (source) {
            var observable = new MyCustomObservable();
            observable.source = source;
            return observable;
        };
        MyCustomObservable.prototype.lift = function (operator) {
            var observable = new MyCustomObservable();
            observable.source = this;
            observable.operator = operator;
            return observable;
        };
        return MyCustomObservable;
    }(Rx.Observable));
    it('should be overrideable in a custom Observable type that composes', function (done) {
        var result = new MyCustomObservable(function (observer) {
            observer.next(1);
            observer.next(2);
            observer.next(3);
            observer.complete();
        }).map(function (x) { return 10 * x; });
        chai_1.expect(result instanceof MyCustomObservable).to.be.true;
        var expected = [10, 20, 30];
        result.subscribe(function (x) {
            chai_1.expect(x).to.equal(expected.shift());
        }, function (x) {
            done(new Error('should not be called'));
        }, function () {
            done();
        });
    });
    it('should compose through multicast and refCount', function (done) {
        var result = new MyCustomObservable(function (observer) {
            observer.next(1);
            observer.next(2);
            observer.next(3);
            observer.complete();
        })
            .multicast(function () { return new Rx.Subject(); })
            .refCount()
            .map(function (x) { return 10 * x; });
        chai_1.expect(result instanceof MyCustomObservable).to.be.true;
        var expected = [10, 20, 30];
        result.subscribe(function (x) {
            chai_1.expect(x).to.equal(expected.shift());
        }, function (x) {
            done(new Error('should not be called'));
        }, function () {
            done();
        });
    });
    it('should compose through multicast with selector function', function (done) {
        var result = new MyCustomObservable(function (observer) {
            observer.next(1);
            observer.next(2);
            observer.next(3);
            observer.complete();
        })
            .multicast(function () { return new Rx.Subject(); }, function (shared) { return shared.map(function (x) { return 10 * x; }); });
        chai_1.expect(result instanceof MyCustomObservable).to.be.true;
        var expected = [10, 20, 30];
        result.subscribe(function (x) {
            chai_1.expect(x).to.equal(expected.shift());
        }, function (x) {
            done(new Error('should not be called'));
        }, function () {
            done();
        });
    });
    it('should compose through combineLatest', function () {
        var e1 = cold('-a--b-----c-d-e-|');
        var e2 = cold('--1--2-3-4---|   ');
        var expected = '--A-BC-D-EF-G-H-|';
        var result = MyCustomObservable.from(e1).combineLatest(e2, function (a, b) { return String(a) + String(b); });
        chai_1.expect(result instanceof MyCustomObservable).to.be.true;
        expectObservable(result).toBe(expected, {
            A: 'a1', B: 'b1', C: 'b2', D: 'b3', E: 'b4', F: 'c4', G: 'd4', H: 'e4'
        });
    });
    it('should compose through concat', function () {
        var e1 = cold('--a--b-|');
        var e2 = cold('--x---y--|');
        var expected = '--a--b---x---y--|';
        var result = MyCustomObservable.from(e1).concat(e2, rxTestScheduler);
        chai_1.expect(result instanceof MyCustomObservable).to.be.true;
        expectObservable(result).toBe(expected);
    });
    it('should compose through merge', function () {
        var e1 = cold('-a--b-| ');
        var e2 = cold('--x--y-|');
        var expected = '-ax-by-|';
        var result = MyCustomObservable.from(e1).merge(e2, rxTestScheduler);
        chai_1.expect(result instanceof MyCustomObservable).to.be.true;
        expectObservable(result).toBe(expected);
    });
    it('should compose through race', function () {
        var e1 = cold('---a-----b-----c----|');
        var e1subs = '^                   !';
        var e2 = cold('------x-----y-----z----|');
        var e2subs = '^  !';
        var expected = '---a-----b-----c----|';
        var result = MyCustomObservable.from(e1).race(e2);
        chai_1.expect(result instanceof MyCustomObservable).to.be.true;
        expectObservable(result).toBe(expected);
        expectSubscriptions(e1.subscriptions).toBe(e1subs);
        expectSubscriptions(e2.subscriptions).toBe(e2subs);
    });
    it('should compose through zip', function () {
        var e1 = cold('-a--b-----c-d-e-|');
        var e2 = cold('--1--2-3-4---|   ');
        var expected = ('--A--B----C-D|   ');
        var result = MyCustomObservable.from(e1).zip(e2, function (a, b) { return String(a) + String(b); });
        chai_1.expect(result instanceof MyCustomObservable).to.be.true;
        expectObservable(result).toBe(expected, {
            A: 'a1', B: 'b2', C: 'c3', D: 'd4'
        });
    });
    it('should allow injecting behaviors into all subscribers in an operator ' +
        'chain when overridden', function (done) {
        // The custom Subscriber
        var log = [];
        var LogSubscriber = (function (_super) {
            __extends(LogSubscriber, _super);
            function LogSubscriber() {
                _super.apply(this, arguments);
            }
            LogSubscriber.prototype.next = function (value) {
                log.push('next ' + value);
                if (!this.isStopped) {
                    this._next(value);
                }
            };
            return LogSubscriber;
        }(Rx.Subscriber));
        // The custom Operator
        var LogOperator = (function () {
            function LogOperator(childOperator) {
                this.childOperator = childOperator;
            }
            LogOperator.prototype.call = function (subscriber, source) {
                return this.childOperator.call(new LogSubscriber(subscriber), source);
            };
            return LogOperator;
        }());
        // The custom Observable
        var LogObservable = (function (_super) {
            __extends(LogObservable, _super);
            function LogObservable() {
                _super.apply(this, arguments);
            }
            LogObservable.prototype.lift = function (operator) {
                var observable = new LogObservable();
                observable.source = this;
                observable.operator = new LogOperator(operator);
                return observable;
            };
            return LogObservable;
        }(Observable));
        // Use the LogObservable
        var result = new LogObservable(function (observer) {
            observer.next(1);
            observer.next(2);
            observer.next(3);
            observer.complete();
        })
            .map(function (x) { return 10 * x; })
            .filter(function (x) { return x > 15; })
            .count();
        chai_1.expect(result instanceof LogObservable).to.be.true;
        var expected = [2];
        result.subscribe(function (x) {
            chai_1.expect(x).to.equal(expected.shift());
        }, function (x) {
            done(new Error('should not be called'));
        }, function () {
            chai_1.expect(log).to.deep.equal([
                'next 10',
                'next 20',
                'next 20',
                'next 30',
                'next 30',
                'next 2' // count
            ]);
            done();
        });
    });
});
//# sourceMappingURL=Observable-spec.js.map