public void RegistrationStart_Method()
 {
   var call = new LawsLawApiCall();
   Assert.False(call.Parameters.ContainsKey("registration_start"));
   var date = DateTime.UtcNow;
   Assert.True(ReferenceEquals(call.RegistrationStart(date), call));
   Assert.Equal(date.RuLawDate(), call.Parameters["registration_start"]);
 }