Testing with JIntent

Import the helpers from tests only:

import 'package:jintent/testing.dart';

Record states

final controller = CounterController();
final states = JStateRecorder(controller);

await controller.intent(IncrementIntent());

expect(states.states, [const CounterState(count: 1)]);
states.dispose();
controller.dispose();

The recorder captures changes made after it is attached, in order. Equal updates never appear because controllers skip them.

Play the UI for effects

JEffectRecorder listens to a controller’s effects, records them and completes awaitable ones with scripted answers, so intents that wait for a dialog can run without widgets:

final ui = JEffectRecorder(controller)
  ..respondTo<ConfirmDelete, bool>((effect) => true);

await controller.intent(DeleteIntent());

expect(ui.effectsOfType<ConfirmDelete>(), hasLength(1));
await ui.dispose();

Register responses per concrete effect type. An unanswered awaitable effect stays pending, which lets you test timeouts; pass failUnhandled: true to fail it with StateError instead. A responder that throws fails the effect with that error.

Reset global state

JObserver, JEffectsConfig, JMetrics and EitherConfig are process-wide. Call resetJIntentGlobals() in setUp or tearDown so one test cannot affect another.

setUp(resetJIntentGlobals);