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refactor: Move the Hlc generation from Dart to the database (#20)

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Marcelo Mendonça Soares 2026-02-05 22:38:12 -03:00 • committed by GitHub
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test/crdt/crdt_merge_canonical_time_test.dart Normal file
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import 'package:drift_offline_sync/drift_offline_sync.dart';
import 'package:test/test.dart';
import '../utils/crdt_context.dart';
import '../utils/database.dart';
void main() {
group('Given CRDT with an existing canonical time', () {
late OfflineSyncCrdt crdt;
late CrdtDatabase crdtDb;
late Hlc initialHlc;
const otherNodeId = 'other';
final initialDateTime = DateTime.now().toUtc();
setUp(() async {
(crdt, crdtDb, _) = database.crdtContext;
await crdtDb.managers.crdtHlcStateTable.create(
(t) => t(
userId: crdt.userId,
lastTimestamp: initialDateTime.millisecondsSinceEpoch,
counter: 17,
),
);
initialHlc = await crdt.getCanonicalTime();
});
test('when merging an HLC with higher time and counter '
'then the canonical time has the new HLC timestamp and counter.', () async {
final newHlc = Hlc(initialDateTime.advance(), 18, otherNodeId);
await crdt.mergeCanonicalTime(newHlc);
final canonicalTime = await crdt.getCanonicalTime();
expect(canonicalTime, equals(newHlc.copyWith(nodeId: crdt.nodeId)));
});
test('when merging an HLC with higher time and lower counter '
'then the canonical time has the new HLC timestamp and counter.', () async {
final newHlc = Hlc(initialDateTime.advance(), 0, otherNodeId);
await crdt.mergeCanonicalTime(newHlc);
final canonicalTime = await crdt.getCanonicalTime();
expect(canonicalTime, equals(newHlc.copyWith(nodeId: crdt.nodeId)));
});
test('when merging an HLC with lower time and counter '
'then the canonical time is the initial HLC.', () async {
final newHlc = Hlc(initialDateTime.retreat(), 0, otherNodeId);
await crdt.mergeCanonicalTime(newHlc);
final canonicalTime = await crdt.getCanonicalTime();
expect(canonicalTime, equals(initialHlc));
});
test('when merging an HLC with lower time and higher counter '
'then the canonical time is the initial HLC.', () async {
final newHlc = Hlc(initialDateTime.retreat(), 18, otherNodeId);
await crdt.mergeCanonicalTime(newHlc);
final canonicalTime = await crdt.getCanonicalTime();
expect(canonicalTime, equals(initialHlc));
});
test('when merging an HLC with same time and higher counter '
'then the canonical time has the higher counter.', () async {
final newHlc = Hlc(initialDateTime, 18, otherNodeId);
await crdt.mergeCanonicalTime(newHlc);
final canonicalTime = await crdt.getCanonicalTime();
expect(canonicalTime, equals(newHlc.copyWith(nodeId: crdt.nodeId)));
});
test('when merging an HLC with same time and lower counter '
'then the canonical time is the initial HLC.', () async {
final newHlc = Hlc(initialDateTime, 0, otherNodeId);
await crdt.mergeCanonicalTime(newHlc);
final canonicalTime = await crdt.getCanonicalTime();
expect(canonicalTime, equals(initialHlc));
});
test('when merging an HLC with same time and counter '
'then the canonical time is the initial HLC.', () async {
final newHlc = Hlc(initialDateTime, 17, otherNodeId);
await crdt.mergeCanonicalTime(newHlc);
final canonicalTime = await crdt.getCanonicalTime();
expect(canonicalTime, equals(initialHlc));
});
});
}
extension on DateTime {
DateTime advance() => add(const Duration(milliseconds: 1));
DateTime retreat() => subtract(const Duration(milliseconds: 1));
}