blooming_test 0.1.3

Comprehensive declarative testing harness and custom LPDAG matchers for the Bloom reactive framework.

blooming_test

A comprehensive, declarative testing harness and LPDAG state matcher library for the blooming reactive state framework.

Features

• Declarative Test Runner (bloomTest<T>): Test reactive state transitions, mutations, and derived pipelines with a structured, step-by-step API (build, target, act, wait, expect, verify, tearDown).
• Deterministic Virtual Time (FakeAsync): Effortlessly fast-forward debounce, throttle, interval, and time-based graceful mooring windows with zero wall-clock latency.
• LPDAG Custom Matchers:
  • isDormant / isActive: Verify zero-leak subscriber-driven dormant lifecycle states.
  • hasSubscribers(n): Interrogate active subscriber count in the reactive graph.
  • hasGlitchFreedom: Prove absence of diamond-dependency intermediate glitch states.
  • isData(expected) / isEmptyState(reason) / isErrorState(error): Deep-match 3-State BloomSnapshot containers.
• Pure Dart: Zero Flutter SDK dependency; runs seamlessly in Server, CLI, VM, and Web test environments.

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Installation

Add blooming_test to your dev_dependencies in pubspec.yaml:

dev_dependencies:
  test: ^1.25.0
  blooming_test: ^0.1.0

Or run:

dart pub add dev:blooming_test

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Practical Examples & Usage

Example 1: Testing a Business Logic Store (bloomTest)

Test state mutations and derived computation pipelines using a declarative lifecycle:

import 'package:test/test.dart';
import 'package:blooming/blooming.dart';
import 'package:blooming_test/blooming_test.dart';

/// Shopping cart business logic store
class CartStore {
  final items = BloomController<List<String>>([]);

  /// Derived reactive count: auto-computed via BloomVia
  late final Bloom<int> itemCount = computed((via) => via(items.bloom).length);

  void addItem(String item) {
    items.data = [...items.data, item];
  }

  void removeItem(String item) {
    items.data = items.data.where((i) => i != item).toList();
  }
}

void main() {
  group('CartStore Tests', () {
    bloomTest<CartStore>(
      'tracks item additions, removals, and updates derived itemCount',
      build: () => CartStore(),
      target: (store) => store.itemCount,
      act: (store) {
        store.addItem('MacBook Pro');
        store.addItem('Magic Mouse');
        store.removeItem('Magic Mouse');
      },
      // Target emits distinct states: initial 0 -> 1 -> 2 -> 1
      expect: () => [0, 1, 2, 1],
      verify: (store) {
        expect(store.items.data, ['MacBook Pro']);
        expect(untracked(store.itemCount), 1);
      },
    );
  });
}

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Example 2: Testing Debounce & Temporal Pipelines with Virtual Time (wait)

When testing query.bloom.debounced(...), you do not need real Future.delayed delays. Pass wait: Duration(...) to advance virtual time instantaneously with built-in FakeAsync:

class SearchStore {
  SearchStore() {
    debouncedQuery = query.bloom.debounced(const Duration(milliseconds: 300));
  }

  final query = BloomController('');
  late final Bloom<String> debouncedQuery;
}

void main() {
  group('SearchStore Debounce Test', () {
    bloomTest<SearchStore>(
      'suppresses rapid keystrokes and only emits the last value after 300ms',
      build: () => SearchStore(),
      target: (store) => store.debouncedQuery,
      act: (store) {
        // User types rapidly within 300ms
        store.query.data = 'd';
        store.query.data = 'da';
        store.query.data = 'dart';
      },
      // Fast-forward 300ms virtual clock instantly
      wait: const Duration(milliseconds: 300),
      // Intermediate 'd' and 'da' are collapsed; only initial '' and 'dart' are emitted
      expect: () => ['', 'dart'],
      verify: (store) {
        expect(store.query.data, 'dart');
      },
    );
  });
}

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Example 3: Verifying LPDAG Inactive Dormancy (isDormant, isActive)

Verify the zero-leak Subscriber-Driven Inactive Dormancy invariant. When an effect runner or UI disconnects, nodes must automatically return to dormancy:

test('proves derived node enters zero-leak dormancy when unobserved', () {
  final count = BloomController(10);
  final doubled = computed((via) => via(count.bloom) * 2);

  // 1. Initially dormant: 0 active subscribers
  expect(doubled, isDormant);
  expect(count, isDormant);

  // 2. Active observation wakes up the node
  final runner = doubled.effect(() {}).run();
  expect(doubled, isActive);
  expect(doubled, hasSubscribers(1));

  // 3. Deactivating the runner returns the graph to dormant state
  runner.deactivate();
  expect(doubled, isDormant);
});

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Example 4: Testing 3-State FSM Snapshots (isData, isEmptyState, isErrorState)

Assert that nodes or controllers transition cleanly between Data, Empty, and Error states:

test('verifies 3-State FSM transitions', () {
  // 1. Initial Empty state with descriptive reason
  final user = BloomController<String>.late(reason: 'AwaitingAuth');
  expect(user, isEmptyState('AwaitingAuth'));

  // 2. Transition to valid Data state
  user.data = 'Alice';
  expect(user, isData('Alice'));

  // 3. Transition to Error state
  user.setError(Exception('Session expired'));
  expect(user, isErrorState());
});

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Complete Executable Example

Check out the full, runnable showcase at example/blooming_test_example.dart. Run it directly via:

dart test example/blooming_test_example.dart

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License

Apache License 2.0. Copyright 2023-2026 Youngjune Jeon.