public void Test_AddCopyOfBookToDatabase() { Copy testCopy = new Copy(2, 1, 1); testCopy.Save(); Book newBook = new Book("The Sun Also Rises", "1930s Spain", 1); newBook.Save(); testCopy.AddCopy(newBook); List <Copy> result = Copy.GetAll(); List <Copy> testList = new List <Copy> { testCopy }; Assert.Equal(testList, result); }