
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "CheckOutBook adds book with borrower")] 
        public void CheckOutBook_AddsBookWithCorrectBorrower() {
            var tracker = new LibraryBookTracker();
            tracker.CheckOutBook("Dune", "Frank");
            var borrowed = tracker.ListBorrowedBooks();
            Assert.Contains("Book: Dune, Borrower: Frank", borrowed);
        }

        [Fact(DisplayName = "ReturnBook removes book from collection")] 
        public void ReturnBook_RemovesBook() {
            var tracker = new LibraryBookTracker();
            tracker.CheckOutBook("Dune", "Frank");
            tracker.ReturnBook("Dune");
            var borrowed = tracker.ListBorrowedBooks();
            Assert.DoesNotContain("Book: Dune, Borrower: Frank", borrowed);
        }

        [Fact(DisplayName = "ListBorrowedBooks returns all borrowed books with correct info")] 
        public void ListBorrowedBooks_ReturnsAllCorrectBooks() {
            var tracker = new LibraryBookTracker();
            tracker.CheckOutBook("Dune", "Frank");
            tracker.CheckOutBook("Foundation", "Isaac");
            var borrowed = tracker.ListBorrowedBooks();
            Assert.Contains("Book: Dune, Borrower: Frank", borrowed);
            Assert.Contains("Book: Foundation, Borrower: Isaac", borrowed);
            Assert.Equal(2, borrowed.Count);
        }

        [Fact(DisplayName = "Books not checked out do not appear in borrowed books list")] 
        public void NotCheckedOutBooks_DoNotAppear() {
            var tracker = new LibraryBookTracker();
            tracker.CheckOutBook("Dune", "Frank");
            var borrowed = tracker.ListBorrowedBooks();
            Assert.DoesNotContain("Book: 1984, Borrower: Bob", borrowed);
        }
    }
}

ProgramTests.cs

Master the essential C# collections, from basic lists to advanced dictionaries and sets. This course blends engaging theory with practical, real-world challenges to help you confidently use collections in your C# projects.

Explore the foundational C# collections: arrays and lists. Learn how to create, manipulate, and apply them to solve practical problems.

Delve into C# dictionaries and related collections for efficient key-based data storage and retrieval.

Discover C# sets and useful collection utilities for advanced data manipulation and analysis.

Challenge: Library Book Tracker

解答