tp1Entity/tp1/UnitTests/UnitTest1.cs

using DbContextLib;
using Entities;
using Microsoft.Extensions.Options;
using Microsoft.EntityFrameworkCore;
using System.Linq;
using Xunit;
using Microsoft.Data.Sqlite;

namespace UnitTests
{
    public class UnitTest1
    {
        [Fact]
        public void Add_Test()
        {
            //connection must be opened to use In-memory database
            var connection = new SqliteConnection("DataSource=:memory:");
            connection.Open();

            var options = new DbContextOptionsBuilder<LibraryContext>.UseSqlLite().options;

            //prepares the database with one instance of the context
            using (var context = new LibraryContext(options))
            {
                //context.Database.OpenConnection();
                context.Database.EnsureCreated();

                BookEntity the100 = new BookEntity( "the100", "", "" );
                BookEntity princeOfPersia = new BookEntity ( "princeOfPersia", "", "" );
                BookEntity PercyJackson = new BookEntity ("PercyJackson", "", "" );
                context.BooksSet.Add(the100);
                context.BooksSet.Add(princeOfPersia);
                context.BooksSet.Add(PercyJackson);
                context.SaveChanges();
            }

            //uses another instance of the context to do the tests
            using (var context = new LibraryContext(options))
            {
                context.Database.EnsureCreated();

                Assert.Equal(3, context.BooksSet.Count());
                Assert.Equal("the100", context.BooksSet.First().Title);
            }
        }

    }
}