error-flutter-ttd

GetTriviaForConcreteNumber should emit [Error] when the input is invalid:

ERROR: NoSuchMethodError: The method 'fold' was called on null.
Receiver: null
Tried calling: fold<int>(0, Closure: (int, dynamic) => int)
dart:core                                                                         Object.noSuchMethod
package:equatable/src/equatable_utils.dart 4:19                                   mapPropsToHashCode
package:equatable/src/equatable.dart 35:46                                        Equatable.hashCode
dart:collection                                                                   _CompactLinkedHashSet.contains
package:matcher/src/pretty_print.dart 28:14                                       prettyPrint._prettyPrint
package:matcher/src/pretty_print.dart 119:22                                      prettyPrint
package:matcher/src/description.dart 49:11                                        StringDescription.addDescriptionOf
package:matcher/src/equals_matcher.dart 258:19                                    _DeepMatcher.describe
package:test_api                                                                  emitsInOrder
test/features/number_trivia/presentation/bloc/number_trivia_bloc_test.dart 66:45  main.<fn>.<fn>