Testing RxJs 5.x throttling using jasmine.clock

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// Testing throttling example
var throttleTimeWindowDuration = 2 * 1000; /* 2 seconds */

function throttleTest() {
  var unthrottleTimedStream = new Rx.Subject();
  var source = unthrottleTimedStream.throttleTime(throttleTimeWindowDuration);
  var result = {
    emitCounter: 0,
    unthrottleTimedStream
  };

  var subscription = source.subscribe(
    function() {
      result.emitCounter++;
    });

  return result;
}

describe('using jasmine.clock', function() {
  beforeEach(() => {
    jasmine.clock().install();
  });

  afterEach(() => {
    jasmine.clock().uninstall();
  });

  it('allows to test throttling synchronously', function() {
    var throttleTestResult = throttleTest();
    
    throttleTestResult.unthrottleTimedStream.next();
    throttleTestResult.unthrottleTimedStream.next();
    
    jasmine.clock().tick(throttleTimeWindowDuration);
    throttleTestResult.unthrottleTimedStream.next();
    throttleTestResult.unthrottleTimedStream.next();
    
    jasmine.clock().tick(throttleTimeWindowDuration);
    throttleTestResult.unthrottleTimedStream.next();
    
    jasmine.clock().tick(throttleTimeWindowDuration);
    throttleTestResult.unthrottleTimedStream.next();

    expect(throttleTestResult.emitCounter).toBe(4);
  });
});