i_tdd

A utility-first package for simplifying Clean Architecture and Test-Driven Development in Flutter using Dart. It provides a wide range of abstract use cases, parameter objects, error handling extensions, and state classes, all designed to make your code more modular, testable, and maintainable.

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Features

• ✅ Ready-to-use abstract classes for Future, Stream, Either, and Option-based use cases
• 🧱 Parameter classes like NoParams and ListQuery
• 🧩 Extensions for error handling and reporting with Either
• 🧼 Clean Bloc state classes and a utility LoadingCubit
• 🧪 Designed with TDD and Clean Architecture in mind

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Installation

Add the package to your pubspec.yaml:

dependencies:
  i_tdd: ^0.0.1

Then run:

flutter pub get

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Usage

1. Define a Use Case

class GetItems extends IEitherUseCase<List<Item>, NoParams> {
  @override
  Future<Either<IFailure, List<Item>>> call(NoParams params) {
    // implement business logic
  }
}

2. Bloc Integration

class ItemsCubit extends Cubit<BaseState> {
  final GetItems getItems;

  ItemsCubit(this.getItems) : super(Initial());

  void fetchItems() async {
    emit(DataLoading());
    final result = await getItems(NoParams());

    result.handleReport(
      onSuccess: (data) => emit(DataLoaded()),
      onFailed: (msg) => emit(ErrorState(msg)),
      onEmpty: () => emit(ErrorState('No items found')),
    );
  }
}

3. Load Stream Data

streamUseCase.loadStreamData(
  params: NoParams(),
  onLoading: () => emit(DataLoading()),
  onSuccess: (data) => emit(DataLoaded()),
  onEmpty: () => emit(ErrorState('No stream data')),
  onFailed: (msg) => emit(ErrorState(msg)),
);

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API Overview

Abstract Use Cases

• IEitherUseCase
• IEitherNonFutureUseCase
• IEitherStreamUseCase
• IOptionUseCase
• IOptionStreamUseCase
• IFutureOptionStreamUseCase
• IStreamUseCase
• IFutureUseCase
• IUseCase

Params

• NoParams
• ListQuery

Extensions

• ErrorHandlingExtension on Object
• ReportEitherExtensions on Either
• FutureStreamDataLoadingExtension for IFutureOptionStreamUseCase
• StreamDataLoadingExtension for IOptionStreamUseCase
• StreamDataHandlingExtension for Option<Stream>

States

• BaseState and concrete states: Initial, DataLoading, DataLoaded, ErrorState, etc.
• FormSubmissionState and states: InitialFormState, FormSubmitting, SubmissionSuccess, SubmissionFailed

Utilities

• LoadingCubit
• Typedefs for SuccessCallback, FailureCallback, StreamCallback

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License

MIT License. See LICENSE for details.

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Contribution

Contributions are welcome! Please submit issues and pull requests to help improve this package.