chore: Move the drift_offline_first to legacy in favor of Serverpod implementation (#32)

legacy/drift_offline_sync/test/triggers/trigger_creation_test.dart

@@ -0,0 +1,35 @@
+import 'package:drift_offline_sync/src/database/triggers.dart';
+import 'package:test/test.dart';
+
+import '../utils/database.dart';
+
+void main() {
+  group('Given a database with an OfflineSyncMigrator', () {
+    group('when running the migration', () {
+      setUp(() async {
+        // Insert a new row to trigger the migration.
+        await database.managers.todosTable.create(
+          (t) => t(content: 'test'),
+        );
+      });
+
+      test('then the triggers are created for every synchronized table.', () async {
+        final allTriggerNames = await database.getCrdtTriggers();
+
+        for (final table in database.createMigrator().synchronizedTables) {
+          final triggerNames = allTriggerNames
+              .where((name) => name.startsWith('__crdt__${table.actualTableName}__'))
+              .toList();
+
+          expect(triggerNames, contains('__crdt__${table.actualTableName}__insert'));
+          expect(triggerNames, contains('__crdt__${table.actualTableName}__update'));
+          expect(triggerNames, contains('__crdt__${table.actualTableName}__delete'));
+        }
+      });
+    });
+  });
+
+  // TODO: Add a test for the case where a table has no primary key.
+  // TODO: Add a test for the case where a table has multiple primary key columns.
+  // TODO: Add a test for the case where a table has only primary key columns.
+}