public void UnitTest9()
{
var context = new CalDavContext(new DbContextOptions <CalDavContext>());
var prinRepository = new PrincipalRepository(context);
var user = prinRepository.CreateWorkerInSystem("*****@*****.**", "worker", "UnitTest9 worker", _faculty,
"Weboo");
context.SaveChanges();
Assert.True(context.Workers.Count() > 0);
var worker = context.Workers.FirstOrDefault(x => x.Email == "*****@*****.**");
Assert.NotNull(worker);
Assert.NotNull(context.Principals.FirstOrDefault(x => x.PrincipalId == worker.PrincipalId.Value));
Assert.NotNull(context.CalendarCollections.FirstOrDefault(x => x.PrincipalId == worker.PrincipalId.Value));
}