public async Task UpdateCustomerTest() { //arrange var requestId = new GetCustomerRequest { IdFilter = 3 }; CustomerDto toUpdate = _target.GetCustomer(requestId); //act toUpdate.FirstName = "Anna-Lena"; Empty emptyUpdate = _target.UpdateCustomer(toUpdate); // assert toUpdate = _target.GetCustomer(requestId); Assert.Equal("Anna-Lena", toUpdate.FirstName); }