public void TestMethod9_AddParentTask()
{
TaskModel obj = new TaskModel()
{
TaskID = 100, TaskName = "Task1"
};
Mock <IProjectDbService> mock = new Mock <IProjectDbService>();
ProjectManagerBL projBL = new ProjectManagerBL(mock.Object);
projBL.AddParentTask(obj);
mock.Verify(c => c.AddParentTask(It.IsAny <ParentTask>()), Times.Once);
}