public override void TestInitialize() { base.TestInitialize(); var options = new DbContextOptionsBuilder <SportsClubDbContext>() .UseInMemoryDatabase("TestDb") .Options; var c = new SportsClubDbContext(options); obj = new TestClass(c, c.Clients); count = GetRandom.UInt8(20, 40); foreach (var p in c.Clients) { c.Entry(p).State = EntityState.Deleted; } AddItems(); }