public async void TestPostContractor()
        {
            var options = new DbContextOptionsBuilder <Databasecontext
                                                       >().UseInMemoryDatabase(databaseName: "Test3")
                          .Options;

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

                ContractorsController ContractorPositions = new ContractorsController(context);

                var res = await ContractorPositions.PostContractor(contractor);

                var result = context.Contractors.Find(1);
                Assert.Equal("test1", result.Username);
            }
        }