public void Clear()
{
var submgr = new SubscriptionsManager();
submgr.AddSubscriber <TestEvent, TestEventHandler>();
submgr.AddSubscriber <TestDynamicEventHandler>("Test");
Assert.True(submgr.HasSubscribers <TestEvent>());
Assert.True(submgr.HasSubscribers("Test"));
submgr.Clear();
Assert.False(submgr.HasSubscribers <TestEvent>());
Assert.False(submgr.HasSubscribers("Test"));
}