Exemplify the usage of Task.ContinueWith

Task Continuation.cs

        [Theory]
        [InlineData(155, 34)]
        public void TasksContinueWith(int booksAllowance, int booksToWithdraw)
        {
            // Initiate a library account object
            LibraryAccount libraryAccount = new LibraryAccount(booksAllowance);

            Task<int> task = Task.Factory.StartNew<int>(() =>{
                // The first task withdraws books
                libraryAccount.WithdrawBooks(booksToWithdraw);
                return libraryAccount.BorrowedBooksCount;
            })
            .ContinueWith<int>((prevTask) => {
                // Fetching the result from the previous task
                int booksInventory = prevTask.Result;
                Trace.WriteLine($"Current books inventory count {booksInventory}");

                // Return the books back to the library
                libraryAccount.ReturnBooks(booksToWithdraw);
                return libraryAccount.BorrowedBooksCount;

                }, // Set the conditions when to continue the subsequent task
                TaskContinuationOptions.NotOnFaulted | 
                TaskContinuationOptions.NotOnCanceled |
                TaskContinuationOptions.OnlyOnRanToCompletion);

            // Wait for the task to end before continuing the main thread.
            task.Wait();

            // The actual number of books should remain the same
            Assert.Equal(task.Result, booksAllowance);
        }