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();
}
});
});
it('should not send error to error handler for observable have source', function () {
var source = Observable.of(1);
var observable = new Observable();
observable.source = source;
chai_1.expect(function () {
observable.subscribe(function (x) {
throw new Error('error');
});
}).to.throw();
});
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 not be unsubscribed when other empty subscription completes', function () {
var unsubscribeCalled = false;
var source = new Observable(function () {
return function () {
unsubscribeCalled = true;
};
});
source.subscribe();
chai_1.expect(unsubscribeCalled).to.be.false;
Observable.empty().subscribe();
chai_1.expect(unsubscribeCalled).to.be.false;
});
it('should not be unsubscribed when other subscription with same observer completes', function () {
var unsubscribeCalled = false;
var source = new Observable(function () {
return function () {
unsubscribeCalled = true;
};
});
var observer = {
next: function () { }
};
source.subscribe(observer);
chai_1.expect(unsubscribeCalled).to.be.false;
Observable.empty().subscribe(observer);
chai_1.expect(unsubscribeCalled).to.be.false;
});
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 = {
myValue: 'foo',
next: function next(x) {
chai_1.expect(this.myValue).to.equal('foo');
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 = {
myValue: 'foo',
error: function error(err) {
chai_1.expect(this.myValue).to.equal('foo');
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 = {
myValue: 'foo',
complete: function complete() {
chai_1.expect(this.myValue).to.equal('foo');
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 = {
myValue: 'foo',
next: function next(x) {
chai_1.expect(this.myValue).to.equal('foo');
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
