@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
255 lines • 8.8 kB
JavaScript
;
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
/** @test {fromEvent} */
describe('Observable.fromEvent', function () {
asDiagram('fromEvent(element, \'click\')')('should create an observable of click on the element', function () {
var target = {
addEventListener: function (eventType, listener) {
Observable.timer(50, 20, rxTestScheduler)
.mapTo('ev')
.take(2)
.concat(Observable.never())
.subscribe(listener);
},
removeEventListener: function () { return void 0; },
dispatchEvent: function () { return void 0; },
};
var e1 = Observable.fromEvent(target, 'click');
var expected = '-----x-x---';
expectObservable(e1).toBe(expected, { x: 'ev' });
});
it('should setup an event observable on objects with "on" and "off" ', function () {
var onEventName;
var onHandler;
var offEventName;
var offHandler;
var obj = {
on: function (a, b) {
onEventName = a;
onHandler = b;
},
off: function (a, b) {
offEventName = a;
offHandler = b;
}
};
var subscription = Observable.fromEvent(obj, 'click')
.subscribe(function () {
//noop
});
subscription.unsubscribe();
chai_1.expect(onEventName).to.equal('click');
chai_1.expect(typeof onHandler).to.equal('function');
chai_1.expect(offEventName).to.equal(onEventName);
chai_1.expect(offHandler).to.equal(onHandler);
});
it('should setup an event observable on objects with "addEventListener" and "removeEventListener" ', function () {
var onEventName;
var onHandler;
var offEventName;
var offHandler;
var obj = {
addEventListener: function (a, b, useCapture) {
onEventName = a;
onHandler = b;
},
removeEventListener: function (a, b, useCapture) {
offEventName = a;
offHandler = b;
}
};
var subscription = Observable.fromEvent(obj, 'click')
.subscribe(function () {
//noop
});
subscription.unsubscribe();
chai_1.expect(onEventName).to.equal('click');
chai_1.expect(typeof onHandler).to.equal('function');
chai_1.expect(offEventName).to.equal(onEventName);
chai_1.expect(offHandler).to.equal(onHandler);
});
it('should setup an event observable on objects with "addListener" and "removeListener" ', function () {
var onEventName;
var onHandler;
var offEventName;
var offHandler;
var obj = {
addListener: function (a, b) {
onEventName = a;
onHandler = b;
},
removeListener: function (a, b) {
offEventName = a;
offHandler = b;
}
};
var subscription = Observable.fromEvent(obj, 'click')
.subscribe(function () {
//noop
});
subscription.unsubscribe();
chai_1.expect(onEventName).to.equal('click');
chai_1.expect(typeof onHandler).to.equal('function');
chai_1.expect(offEventName).to.equal(onEventName);
chai_1.expect(offHandler).to.equal(onHandler);
});
it('should error on invalid event targets', function () {
var obj = {
addListener: function () {
//noop
}
};
var subscribe = function () { return Observable.fromEvent(obj, 'click').subscribe(); };
chai_1.expect(subscribe).to.throw(TypeError, 'Invalid event target');
});
it('should pass through options to addEventListener', function () {
var actualOptions;
var expectedOptions = { capture: true, passive: true };
var obj = {
addEventListener: function (a, b, c) {
actualOptions = c;
},
removeEventListener: function (a, b, c) {
//noop
}
};
var subscription = Observable.fromEvent(obj, 'click', expectedOptions)
.subscribe(function () {
//noop
});
subscription.unsubscribe();
chai_1.expect(actualOptions).to.equal(expectedOptions);
});
it('should pass through events that occur', function (done) {
var send;
var obj = {
on: function (name, handler) {
send = handler;
},
off: function () {
//noop
}
};
Observable.fromEvent(obj, 'click').take(1)
.subscribe(function (e) {
chai_1.expect(e).to.equal('test');
}, function (err) {
done(new Error('should not be called'));
}, function () {
done();
});
send('test');
});
it('should pass through events that occur and use the selector if provided', function (done) {
var send;
var obj = {
on: function (name, handler) {
send = handler;
},
off: function () {
//noop
}
};
function selector(x) {
return x + '!';
}
Observable.fromEvent(obj, 'click', selector).take(1)
.subscribe(function (e) {
chai_1.expect(e).to.equal('test!');
}, function (err) {
done(new Error('should not be called'));
}, function () {
done();
});
send('test');
});
it('should not fail if no event arguments are passed and the selector does not return', function (done) {
var send;
var obj = {
on: function (name, handler) {
send = handler;
},
off: function () {
//noop
}
};
function selector() {
//noop
}
Observable.fromEvent(obj, 'click', selector).take(1)
.subscribe(function (e) {
chai_1.expect(e).not.exist;
}, function (err) {
done(new Error('should not be called'));
}, function () {
done();
});
send();
});
it('should return a value from the selector if no event arguments are passed', function (done) {
var send;
var obj = {
on: function (name, handler) {
send = handler;
},
off: function () {
//noop
}
};
function selector() {
return 'no arguments';
}
Observable.fromEvent(obj, 'click', selector).take(1)
.subscribe(function (e) {
chai_1.expect(e).to.equal('no arguments');
}, function (err) {
done(new Error('should not be called'));
}, function () {
done();
});
send();
});
it('should pass multiple arguments to selector from event emitter', function (done) {
var send;
var obj = {
on: function (name, handler) {
send = handler;
},
off: function () {
//noop
}
};
function selector(x, y, z) {
return [].slice.call(arguments);
}
Observable.fromEvent(obj, 'click', selector).take(1)
.subscribe(function (e) {
chai_1.expect(e).to.deep.equal([1, 2, 3]);
}, function (err) {
done(new Error('should not be called'));
}, function () {
done();
});
send(1, 2, 3);
});
it('should not throw an exception calling toString on obj with a null prototype', function (done) {
// NOTE: Can not test with Object.create(null) or `class Foo extends null`
// due to TypeScript bug. https://github.com/Microsoft/TypeScript/issues/1108
var NullProtoEventTarget = (function () {
function NullProtoEventTarget() {
}
NullProtoEventTarget.prototype.on = function () { };
NullProtoEventTarget.prototype.off = function () { };
return NullProtoEventTarget;
}());
NullProtoEventTarget.prototype.toString = null;
var obj = new NullProtoEventTarget();
chai_1.expect(function () {
Observable.fromEvent(obj, 'foo').subscribe();
done();
}).to.not.throw(TypeError);
});
});
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