test case for RemoveTaskHelper is failed ,
Reason: While adding taskNode task is also added to the costmodel but when removing the Task it is not removed from the cost_model
//we are adding the task to cost_model when we addTask but not removing it when
//we call removeTask node BUG
costmodel->RemoveTask(tasknode->id);
test case for RemoveTaskHelper is failed , Reason: While adding taskNode task is also added to the costmodel but when removing the Task it is not removed from the cost_model //we are adding the task to cost_model when we addTask but not removing it when //we call removeTask node BUG costmodel->RemoveTask(tasknode->id);