bloc_signals_test

⚡ bloc_signals_test

"With the rigor of BLoC and the flex and speed of Signals"

Declarative unit testing utilities for bloc_signals and CubitSignal instances.

bloc_signals_test provides blocSignalTest, a declarative helper tailored specifically for synchronous reactive signal state propagation, state de-duplication, and observer isolation.

🌐 Ecosystem Packages

The BlocSignal monorepo consists of 10 modular packages:

Package Version Description
bloc_signals pub Core pure Dart reactive state primitives bridging BLoC & Signals
bloc_signals_flutter pub Flutter UI bindings, providers, builders, listeners & selectors
bloc_signals_jaspr pub Jaspr web component integration and state binding for BlocSignal
bloc_signals_riverpod pub Bidirectional Riverpod 2/3 interop adapters & provider extensions
bloc_signals_hydrate pub Automated synchronous local state persistence & hydration
bloc_signals_replay pub Undo & redo state history tracking for CubitSignal and BlocSignal
bloc_signals_otel pub OpenTelemetry tracing and span generation for state transitions
bloc_signals_devtools pub Universal DevTools telemetry observer using dart:developer
bloc_signals_test pub Declarative unit testing utilities (blocSignalTest)
bloc_signals_lint pub Custom analyzer lint rules & automated IDE quick-fixes

⚡ Key Features

  • 🎯 Declarative Assertions: Verify emitted states in exact order using expect.
  • ⏱️ Async Support: Await asynchronous event handlers or timers using wait.
  • ⏭️ State Skipping: Skip initial emissions using skip.
  • 🚨 Error Testing: Verify exceptions caught in onError using errors.
  • 🧹 Automatic Cleanup: Guarantees observer restoration and bloc.close() post-test.

🚀 Getting Started

Add bloc_signals_test to your pubspec.yaml:

dev_dependencies:
  bloc_signals_test: ^0.1.0
  test: ^1.24.0

💡 Quick Examples

1. Cubit Unit Test (blocSignalTest)

import 'package:bloc_signals_test/bloc_signals_test.dart';
import 'package:test/test.dart';

void main() {
  group('CounterCubit', () {
    blocSignalTest<CounterCubit, int>(
      'emits [1] when increment is called',
      build: CounterCubit.new,
      act: (cubit) => cubit.increment(),
      expect: () => [1],
    );
  });
}

2. Async Event Bloc Test (wait & errors)

blocSignalTest<DataBloc, DataState>(
  'emits [DataLoading, DataLoaded] when FetchData succeeds',
  build: () => DataBloc(repository: mockRepo),
  act: (bloc) => bloc.add(FetchData()),
  wait: const Duration(milliseconds: 100),
  expect: () => [
    const DataLoading(),
    const DataLoaded('sample_data'),
  ],
);

🤖 AI Coding Assistant Skill

This package is supported by an official pre-packaged AI Coding Skill representing unit testing patterns, observer isolation, and synchronous assertion guidelines for BlocSignal.

If you develop with AI coding assistants (such as Claude Code, Antigravity, Gemini, Cursor, or Codex), you can load the bloc-signals skill bundle to guide your assistant's code generation and analysis.

📜 License

MIT License. See LICENSE for details.

Libraries

bloc_signals_test