bvandeusen
4eb9935f8e
Foundation for the provider migrations. cacheFirst<D, T> wraps the drift.watch() + REST cold-cache fallback pattern: yields cached rows when present, kicks off REST fetch + drift populate when empty + online, yields empty when offline. REST failures swallow to empty so callers can surface errors via toast. adapters.dart adds CachedX → XRef extension methods + reverse XRef.toDrift() companions for Artist/Album/Track/Playlist. Adapters accept some loss of server-derived fields (coverUrl, streamUrl, ownerUsername) — UI already handles empty values; cold-cache fallback briefly shows the real values before drift takes over. cache_first_test covers all 4 branches (non-empty, empty+online, empty+offline, REST failure). adapters_test covers basic round-trips. Both safe to run on CI runner — no drift open required. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
76 lines
2.3 KiB
Dart
76 lines
2.3 KiB
Dart
import 'dart:async';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:minstrel/cache/cache_first.dart';
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void main() {
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test('non-empty drift emission passes through toResult', () async {
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final controller = StreamController<List<int>>();
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final results = cacheFirst<int, int>(
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driftStream: controller.stream,
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fetchAndPopulate: () async => fail('should not fetch when rows present'),
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toResult: (rows) => rows.fold<int>(0, (a, b) => a + b),
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isOnline: () async => true,
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);
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final firstFuture = results.first;
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controller.add([1, 2, 3]);
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expect(await firstFuture, 6);
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await controller.close();
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});
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test('empty drift emission + online triggers fetchAndPopulate', () async {
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final controller = StreamController<List<int>>();
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var fetchCalled = 0;
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final results = cacheFirst<int, int>(
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driftStream: controller.stream,
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fetchAndPopulate: () async {
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fetchCalled++;
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controller.add([42]); // simulate populate causing re-emission
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},
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toResult: (rows) => rows.fold<int>(0, (a, b) => a + b),
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isOnline: () async => true,
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);
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final firstFuture = results.first;
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controller.add([]);
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expect(await firstFuture, 42);
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expect(fetchCalled, 1);
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await controller.close();
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});
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test('empty drift + offline yields empty result without fetch', () async {
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final controller = StreamController<List<int>>();
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var fetchCalled = 0;
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final results = cacheFirst<int, int>(
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driftStream: controller.stream,
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fetchAndPopulate: () async {
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fetchCalled++;
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},
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toResult: (rows) => rows.fold<int>(0, (a, b) => a + b),
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isOnline: () async => false,
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);
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final firstFuture = results.first;
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controller.add([]);
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expect(await firstFuture, 0);
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expect(fetchCalled, 0);
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await controller.close();
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});
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test('REST failure falls through to empty result', () async {
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final controller = StreamController<List<int>>();
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final results = cacheFirst<int, int>(
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driftStream: controller.stream,
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fetchAndPopulate: () async => throw Exception('REST 500'),
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toResult: (rows) => rows.fold<int>(0, (a, b) => a + b),
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isOnline: () async => true,
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);
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final firstFuture = results.first;
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controller.add([]);
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expect(await firstFuture, 0);
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await controller.close();
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});
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}
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