public void BacklogItemActivityCheckTest()
{
_backlogItem1.AddActivity(new Activity(_backlogItem1.developer, "update database"));
_backlogItem1.backlogState.doing();
_backlogItem1.backlogState.done();
Assert.IsTrue(_backlogItem1.backlogState is DoingBacklogState);
Assert.IsFalse(_backlogItem1.checkActiviesState());
}