Initial and done prolly

test/drift/my_database/migration_test.dart

@@ -0,0 +1,86 @@
+// dart format width=80
+// ignore_for_file: unused_local_variable, unused_import
+import 'package:drift/drift.dart';
+import 'package:drift_dev/api/migrations_native.dart';
+import 'package:groceries_manager/db/database.dart';
+import 'package:test/test.dart';
+import 'generated/schema.dart';
+
+import 'generated/schema_v1.dart' as v1;
+import 'generated/schema_v2.dart' as v2;
+
+void main() {
+  driftRuntimeOptions.dontWarnAboutMultipleDatabases = true;
+  late SchemaVerifier verifier;
+
+  setUpAll(() {
+    verifier = SchemaVerifier(GeneratedHelper());
+  });
+
+  group('simple database migrations', () {
+    // These simple tests verify all possible schema updates with a simple (no
+    // data) migration. This is a quick way to ensure that written database
+    // migrations properly alter the schema.
+    final versions = GeneratedHelper.versions;
+    for (final (i, fromVersion) in versions.indexed) {
+      group('from $fromVersion', () {
+        for (final toVersion in versions.skip(i + 1)) {
+          test('to $toVersion', () async {
+            final schema = await verifier.schemaAt(fromVersion);
+            final db = AppDatabase(schema.newConnection());
+            await verifier.migrateAndValidate(db, toVersion);
+            await db.close();
+          });
+        }
+      });
+    }
+  });
+
+  // The following template shows how to write tests ensuring your migrations
+  // preserve existing data.
+  // Testing this can be useful for migrations that change existing columns
+  // (e.g. by alterating their type or constraints). Migrations that only add
+  // tables or columns typically don't need these advanced tests. For more
+  // information, see https://drift.simonbinder.eu/migrations/tests/#verifying-data-integrity
+  // TODO: This generated template shows how these tests could be written. Adopt
+  // it to your own needs when testing migrations with data integrity.
+  test("migration from v1 to v2 does not corrupt data", () async {
+    // Add data to insert into the old database, and the expected rows after the
+    // migration.
+    // TODO: Fill these lists
+    final oldProductCategoryData = <v1.ProductCategoryData>[];
+    final expectedNewProductCategoryData = <v2.ProductCategoryData>[];
+
+    final oldStorageLocationData = <v1.StorageLocationData>[];
+    final expectedNewStorageLocationData = <v2.StorageLocationData>[];
+
+    final oldProductData = <v1.ProductData>[];
+    final expectedNewProductData = <v2.ProductData>[];
+
+    final oldShoppingListItemData = <v1.ShoppingListItemData>[];
+    final expectedNewShoppingListItemData = <v2.ShoppingListItemData>[];
+
+    await verifier.testWithDataIntegrity(
+      oldVersion: 1,
+      newVersion: 2,
+      createOld: v1.DatabaseAtV1.new,
+      createNew: v2.DatabaseAtV2.new,
+      openTestedDatabase: AppDatabase.new,
+      createItems: (batch, oldDb) {
+        batch.insertAll(oldDb.productCategory, oldProductCategoryData);
+        batch.insertAll(oldDb.storageLocation, oldStorageLocationData);
+        batch.insertAll(oldDb.product, oldProductData);
+        batch.insertAll(oldDb.shoppingListItem, oldShoppingListItemData);
+      },
+      validateItems: (newDb) async {
+        expect(expectedNewProductCategoryData,
+            await newDb.select(newDb.productCategory).get());
+        expect(expectedNewStorageLocationData,
+            await newDb.select(newDb.storageLocation).get());
+        expect(expectedNewProductData, await newDb.select(newDb.product).get());
+        expect(expectedNewShoppingListItemData,
+            await newDb.select(newDb.shoppingListItem).get());
+      },
+    );
+  });
+}