public async void TestReturnContractorId()
        {
            var options = new DbContextOptionsBuilder <Databasecontext
                                                       >().UseInMemoryDatabase(databaseName: "Test2")
                          .Options;

            using (var context = new Databasecontext(options))
            {
                var contractor = new Contractor("test1", "test2", "test3", "test4", "test5");
                context.Add(contractor);
                context.SaveChanges();
                ContractorsController ContractorPositions = new ContractorsController(context);

                var contractors = await ContractorPositions.GetContractor(1);

                Contractor result = contractors.Value;
                Assert.Equal("test1", result.Username);
            }
        }