Javascript 在RxJs中使用TestScheduler测试主题
我使用RxJs计算在特定时间窗口中有多少数据包到达。我的代码基本上如下所示:Javascript 在RxJs中使用TestScheduler测试主题,javascript,unit-testing,rxjs,reactive-extensions-js,Javascript,Unit Testing,Rxjs,Reactive Extensions Js,我使用RxJs计算在特定时间窗口中有多少数据包到达。我的代码基本上如下所示: var packetSubject = new Rx.Subject(); var packetsInWindow = []; function startMonitoring() { var subscription = packetSubject .windowWithTime(1000) .select(function(window) { win
var packetSubject = new Rx.Subject();
var packetsInWindow = [];
function startMonitoring() {
var subscription = packetSubject
.windowWithTime(1000)
.select(function(window) {
window.toArray().subscribe(function(elements) {
packetsInWindow.push(elements.length);
});
})
.subscribe();
}
function newPacket(packet) {
packetSubject.onNext(packet);
}
如何使用Rx TestScheduler对该代码进行单元测试?我找不到任何适合测试对象的例子 看看这个例子:
var x = 0,
scheduler = new Rx.TestScheduler();
var subject = new Rx.Subject();
subject.throttle(100, scheduler).subscribe(function (value) {
x = value;
});
scheduler.scheduleWithAbsolute(0, function () {
subject.onNext(1);//trigger first event with value 1
});
scheduler.scheduleWithAbsolute(50, function () {
expect(x).toEqual(0);//value hasn't been updated
});
scheduler.scheduleWithAbsolute(200, function () {
expect(x).toEqual(1);//value update after throttle's windowDuration
});
scheduler.start();
使用RxJs 4.x,您可以在TestScheduler上调用advanceBy。TestScheduler可以在安装过程中注入。我写了一篇关于它的文章 这是一个例子
var throttleWindowDuration = 2 * 1000; /* 2 seconds */
function throttleTest() {
var unthrottledStream = new Rx.Subject();
var source = unthrottledStream.throttle(throttleWindowDuration);
var result = {
emitCounter: 0,
unthrottledStream
};
var subscription = source.subscribe(
function() {
result.emitCounter++;
});
return result;
}
describe('run with test scheduler', function() {
var testScheduler;
var throttleSpy;
beforeAll(function() {
testScheduler = new Rx.TestScheduler();
var originalThrottle = Rx.Observable.prototype.throttle;
throttleSpy = spyOn(Rx.Observable.prototype, 'throttle')
.and.callFake(function(dueTime) {
return originalThrottle.call(this, dueTime, testScheduler);
});
});
afterAll(function() {
throttleSpy.and.callThrough();
});
it('advancing testScheduler allows to test throttling synchronously', function() {
var throttleTestResult = throttleTest();
//throttled stream will not emit if scheduler clock is at zero
testScheduler.advanceBy(1);
throttleTestResult.unthrottledStream.onNext();
throttleTestResult.unthrottledStream.onNext();
throttleTestResult.unthrottledStream.onNext();
testScheduler.advanceBy(throttleWindowDuration);
throttleTestResult.unthrottledStream.onNext();
throttleTestResult.unthrottledStream.onNext();
testScheduler.advanceBy(throttleWindowDuration);
throttleTestResult.unthrottledStream.onNext();
testScheduler.advanceBy(throttleWindowDuration);
throttleTestResult.unthrottledStream.onNext();
expect(throttleTestResult.emitCounter).toBe(4);
});
});
describe('run without test scheduler', function() {
it('without test scheduler the emit counter will stay at 1 '
+ 'as throttle duration is not elapsed', function() {
var throttleTestResult = throttleTest();
throttleTestResult.unthrottledStream.onNext();
throttleTestResult.unthrottledStream.onNext();
throttleTestResult.unthrottledStream.onNext();
throttleTestResult.unthrottledStream.onNext();
expect(throttleTestResult.emitCounter).toBe(1);
});
});
使用RxJs 5,一切都简单得多。您可以像测试其他基于JavaScript时间的操作一样简单地使用jasmine.clock。
我已经在我的报告中演示了解决方案