public void Can_Retrieve_All_Saved_Income_From_Database()
 {
     using (var repo = new IncomeRepository(_context))
     {
         _context.Staffs.Add(sampleManager);
         _context.SaveChanges();
         var manager = _context.Staffs.Single();
         repo.Create(new Income("income1", 2300, manager.Id));
         //repo.Create(new Income("income2", 4300, manager.Id));
         Assert.AreEqual(2, repo.GetAllIncome().Count());
     }
 }