public async Task InsertCustomerTest()
        {
            // arrange
            DateTime    date = new DateTime(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            CustomerDto cust = new CustomerDto
            {
                FirstName = "Niels",
                LastName  = "Müller",
                BirthDate = date.ToTimestamp()
            };
            // act
            var         requestInsert    = cust;
            CustomerDto customerToInsert = _target.InsertCustomer(requestInsert);
            // assert
            var requestId = new GetCustomerRequest {
                IdFilter = customerToInsert.Id
            };
            CustomerDto insertedCustomer = _target.GetCustomer(requestId);

            Assert.Equal(customerToInsert.Id, insertedCustomer.Id);
            Assert.Equal("Müller", insertedCustomer.LastName);
        }