public async Task GetCustomersCountShouldBeCorrect() { var options = new DbContextOptionsBuilder <WHMSDbContext>().UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options; using var context = new WHMSDbContext(options); context.Customers.Add(new Customer { Email = "*****@*****.**", FirstName = "Pesho", LastName = "Peshov", PhoneNumber = "000000", Address = new Address { } }); await context.SaveChangesAsync(); var service = new CustomersService(context); var count = service.CustomersCount(); Assert.Equal(1, count); }