Managing State in Flutter Using BLoC Pattern/

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Solution: Testing ShoppingCartCubit

Solution: Testing ShoppingCartCubit

View the solution for testing the ShoppingCartCubit.

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Mocking ShoppingCartCubit

Mocking the ShoppingCartCubit is done by extending the MockCubit class provided to us by the bloc_test library.

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class MockShoppingCartCubit extends MockCubit<ShoppingCartState>
    implements ShoppingCartCubit {}

Implementing whenListen()

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ShoppingCartCubit shoppingCartCubit = MockShoppingCartCubit();
whenListen(
  shoppingCartCubit,
  Stream.fromIterable([
    ShoppingCartUpdated(shoppingCart),
    ShoppingCartUpdated(shoppingCart2)
  ]),
  initialState: ShoppingCartInitial());

  • Line 1: This creates a MockShoppingCartCubit instance called shoppingCartCubit.

  • Line 3: This provides the first parameter of the whenListen() ...