public void CreateAddressShouldCreateAddress() { var options = new DbContextOptionsBuilder <XeonDbContext>() .UseInMemoryDatabase(databaseName: "Address_CreateAddress_Database") .Options; var dbContext = new XeonDbContext(options); var addressService = new AddressesService(null, dbContext); addressService.CreateAddress("Street", "Description", "Sofiya", "2000"); addressService.CreateAddress("Street", "Description", "Burgas", "8000"); var addressCount = dbContext.Addresses.ToArray().Count(); Assert.Equal(2, addressCount); }