如何在UTest类中初始化内存数据库上下文

Question

如何在 UnitTest 类中初始化假内存数据库上下文以使用 CatDbContext 来测试存储库。我收到错误：OneTimeSetUp：找不到合适的构造函数。 我需要如何初始化数据库，以用于测试catRepository。

    namespace CatsCRUDAppTest
{
    public class CatRepositoryTests
    {
        private IRepository<Cat> catRepository;
        private FakeDbContext context;

        private Cat defaultCat = new Cat() {Id = 0, Name = "name" };

        // OneTimeSetUp: No suitable constructor was found
        public CatRepositoryTests(FakeDbContext fake)
        {
            catRepository = new CatRepository(fake);
            context = fake;
        }
        //

        [Test]
        public void CreateTrueTest()
        {
            Cat cat = defaultCat;
            catRepository.Create(cat);
            context.SaveChanges();

            Cat existingCat = context.Find<Cat>(cat.Id);

            Assert.IsNotNull(existingCat);
        }
    }

存储库类： 该类获取 CatDbContext 进行初始化。

    namespace DAL.Repositories
{
    public class CatRepository : IRepository<Cat>
    {
        private CatDbContext db;

        public CatRepository(CatDbContext context)
        {
            db = context;
        }
        public async void Create(Cat item)
        {
            await db.Cats.AddAsync(item);
        }

假数据库上下文：

public class FakeDbContext : CatDbContext
    {
        public FakeDbContext(DbContextOptions<CatDbContext> options) : base(options)
        {
        }

        public DbSet<Cat> Cats { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseInMemoryDatabase(databaseName: "FakePersonalSiteDbContext");
        }
}

Answer 1

需要使用dbBuilder。

 private IRepository<Cat>? catRepository;
            private FakeDbContext? context;
    
        [SetUp]
        public void SetUp()
        {
            var dbBuilder = new DbContextOptionsBuilder<CatDbContext>();
            dbBuilder.UseInMemoryDatabase(databaseName: "FakeDbContext");
            context = new (dbBuilder.Options);
            catRepository = new CatRepository(context);
        }